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Re: CARB CHANGE EXPECTATIONS??!!!
[Re: Labratt]
#859296
11/21/10 02:19 PM
11/21/10 02:19 PM
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Joined: Jan 2003
Posts: 12,074
Benton, IL.
DaveRS23
Special needs idiot
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Special needs idiot
Joined: Jan 2003
Posts: 12,074
Benton, IL.
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Well, that would depend. If you can borrow a carb, you absolutely should try more CFM. As for buying carbs to test, not unless you're made of money. My 500" wedge gained just over 1 mph in the 1/8 going from a 950 to a 1050 Dominator. I don't remember exactly what my gain was when I went from an 850 to the 950. But it seems like a mile an hour or so. How big a carb, type of spacer (if any), type of boosters, etc. are best determined through testing. 
Master, again and still
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Re: CARB CHANGE EXPECTATIONS??!!!
[Re: AndyF]
#859301
11/21/10 03:31 PM
11/21/10 03:31 PM
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Joined: Apr 2010
Posts: 1,049
ohio
all spooled up
super stock
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super stock
Joined: Apr 2010
Posts: 1,049
ohio
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Quote:
A 950HP is smaller than an 850 DP. The 1000HP is basically the same carb as a 850 DP. So I'd say that you wouldn't see much difference at all between those carbs unless one of them wasn't set up correctly.
The 950HP is probably the best carb to run on the street but it might slow you down just a tad at the drags. Typically the 950HP will run better than a 850 DP on the street unless you have more than 500 ci.
ANDY can you tell us how the 950 is differed than the 850 it flows less 
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Re: CARB CHANGE EXPECTATIONS??!!!
[Re: all spooled up]
#859303
11/21/10 03:57 PM
11/21/10 03:57 PM
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Joined: Mar 2003
Posts: 9,099
Rogue River, OR
Jeremiah
master
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master
Joined: Mar 2003
Posts: 9,099
Rogue River, OR
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Quote:
Quote:
A 950HP is smaller than an 850 DP. The 1000HP is basically the same carb as a 850 DP. So I'd say that you wouldn't see much difference at all between those carbs unless one of them wasn't set up correctly.
The 950HP is probably the best carb to run on the street but it might slow you down just a tad at the drags. Typically the 950HP will run better than a 850 DP on the street unless you have more than 500 ci.
ANDY can you tell us how the 950 is differed than the 850 it flows less
Quoted from Captain Budget:
"
A Holley "950 HP" is basically a streamlined 750-size (1.38" venturi) main body w/ an 850 (1.75") baseplate. IIRC, that's worth 820-840 cfm from what those who have flow-tested them have said.
A Holley "1000 HP" is a streamlined 850-size (1.56" venturi) main body w/ a 1.75" baseplate. I don't remember what those supposedly flow, but I'm pretty sure it's well below 1000 cfm. "
When I purchased my 1050 QF Annular Booster 4150 they claimed it would flow every bit of 1050 cfm.  I think the QF/Pro-form main body is a different animal from the Holley.
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Re: CARB CHANGE EXPECTATIONS??!!!
[Re: Labratt]
#859304
11/21/10 04:01 PM
11/21/10 04:01 PM
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Joined: Feb 2005
Posts: 4,313
Prospect, PA
BSB67
master
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master
Joined: Feb 2005
Posts: 4,313
Prospect, PA
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My The 950 verses the 850 w/o air horn will mph the same on your single plane intake, but the 950 might pick up the 60 ft, and mid track (shift recovery) performance. Maybe .1 sec. in et. Test it out and let us know.
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Re: CARB CHANGE EXPECTATIONS??!!!
[Re: Labratt]
#859309
11/22/10 01:32 AM
11/22/10 01:32 AM
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Joined: Mar 2003
Posts: 9,099
Rogue River, OR
Jeremiah
master
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master
Joined: Mar 2003
Posts: 9,099
Rogue River, OR
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Quote:
Jeremiah,did you have it flow-tested to see exactly what it flows??? How do you like it? I want more air flow..without hurting streetability,even though I run a 4:56 gear and a 9.5" torque converter! If I can get a couple of mph,and still have low-speed throttle response...I'll be a happy camper!    
I'm sorry to say that we never got that involved this year...or the last three for that matter. I'd love to see what it flows though. As far as street manners it is every bit as good as an 850 HP IMO. It would be cool if you could find one to try locally. I was very worried when I first looked down the throat of the carb. It's like looking through a tube! That said it idles nice and throttle response is good at low speeds. If you can't find one to try locally perhaps we can work something out?
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Re: CARB CHANGE EXPECTATIONS??!!!
[Re: Jeremiah]
#859312
11/22/10 06:05 AM
11/22/10 06:05 AM
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Joined: Mar 2009
Posts: 2,463
Sydney,Australia
tex013
top fuel
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top fuel
Joined: Mar 2009
Posts: 2,463
Sydney,Australia
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i just tried a ultra hp950 against my mighty demon 825 on my package i lost about 3/10's and 3-4 mph.just did not get it done.did chassis dyno a tad over 400rwhp it did seem to want to run richer than the demon go figure good luck Tex ps.just ran a new pb 11.308 on sunday.crap i broke out
New best ET 10.259@129.65 .
New best MPH 130.32
Finally fitted a solid cam,
stepped it up a bit more
3690lbs through the mufflers
New World block 3780lbs 10.278@130.80 . Wowser 10.253@130.24 footbraking from 1500rpm
Power by Tex's Automotive
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Re: CARB CHANGE EXPECTATIONS??!!!
[Re: Labratt]
#859314
11/22/10 01:53 PM
11/22/10 01:53 PM
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Joined: Nov 2003
Posts: 2,131
New Lenox IL
cudadon
top fuel
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top fuel
Joined: Nov 2003
Posts: 2,131
New Lenox IL
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Randy I doubt you would see much if any change. It's confusing but the 850 flows more than a 950. Talk to Dwayne about this. Now if you could borrow/buy a 1050 Dom. you probably would see mph difference. I remember Dwayne saying in just about every combo a WELL tuned Dom. will outperform a 4150! OK you dirty rat you! sorry just had to say it.  Don
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Re: CARB CHANGE EXPECTATIONS??!!!
[Re: Labratt]
#859319
11/22/10 06:46 PM
11/22/10 06:46 PM
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Joined: Feb 2005
Posts: 5,221
Branson, Mo.
joedust451
super gas
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super gas
Joined: Feb 2005
Posts: 5,221
Branson, Mo.
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Quote:
I want more air flow..without hurting streetability, If I can get a couple of mph,and still have low-speed throttle response...I'll be a happy camper!
Then get a TR & 2 carbs , i'm serious, if your looking for flow, i will say this, unless your carb is jacked up & has issues & not tuned right, your not going to see enough gain to justicy the exspence going with another single carb, your 850 flows alot, more then a 950, thats where some get confused, they look at the larger #, but its just a #, all a 950 is is a tricked out 750 with an 850 base, like mentioned earlier, it'll most likely give you better 60ft. times which will help ET, but if your wanting "flow" & MPH get a TR, i'm sure it'll 60ft. & ET better too. Then you'll be a VERY happy camper.
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Re: CARB CHANGE EXPECTATIONS??!!!
[Re: joedust451]
#859321
11/22/10 09:23 PM
11/22/10 09:23 PM
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Joined: Jan 2003
Posts: 12,074
Benton, IL.
DaveRS23
Special needs idiot
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Special needs idiot
Joined: Jan 2003
Posts: 12,074
Benton, IL.
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Why not just get a used Dominator and try it? You KNOW that they flow their rating. It is a shame that the cfm ratings on so many carbs are fiction.
Get a 1/2" adapter and a used Dominator (or better yet, borrow one) and see how it likes it.
Master, again and still
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Re: CARB CHANGE EXPECTATIONS??!!!
[Re: joedust451]
#859322
11/22/10 09:30 PM
11/22/10 09:30 PM
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Joined: Nov 2006
Posts: 1,457
oklahoma
forphorty
pro stock
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pro stock
Joined: Nov 2006
Posts: 1,457
oklahoma
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Quote:
Quote:
I want more air flow..without hurting streetability, If I can get a couple of mph,and still have low-speed throttle response...I'll be a happy camper!
Then get a TR & 2 carbs , i'm serious, if your looking for flow, i will say this, unless your carb is jacked up & has issues & not tuned right, your not going to see enough gain to justicy the exspence going with another single carb, your 850 flows alot, more then a 950, thats where some get confused, they look at the larger #, but its just a #, all a 950 is is a tricked out 750 with an 850 base, like mentioned earlier, it'll most likely give you better 60ft. times which will help ET, but if your wanting "flow" & MPH get a TR, i'm sure it'll 60ft. & ET better too. Then you'll be a VERY happy camper.
 Check out Dwayne Porters numbers http://www.moparts.org/Tech/Archive/bb/8.html
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Re: CARB CHANGE EXPECTATIONS??!!!
[Re: Labratt]
#859323
11/22/10 09:40 PM
11/22/10 09:40 PM
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Joined: Jan 2003
Posts: 14,496
So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,496
So. Burlington, Vt.
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on a stock stroke 440 based combo, especially in a heavy car, if i were to be inclined to use a downleg booster carb, i'd stick with something that had a 1.425-1.450 max venturi diameter.
going from memory here....
Mighty Demon 750 = 1.400
Mighty Demon 825 = 1.425
QFT Q-750 = 1.375
QFT Q-850 = 1.400
QFT Q-950 = 1.450
QFT Q-1050 = 1.590
it can be a challenge to get a large bore, downleg carb to leave hard with a 3.75 stroke motor in a heavy car.
also, sometimes the shift recovery isnt that great either.....although they often make good power on the dyno.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
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Re: CARB CHANGE EXPECTATIONS??!!!
[Re: Labratt]
#859324
11/22/10 10:13 PM
11/22/10 10:13 PM
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Joined: Sep 2005
Posts: 2,442
LOWELL IN
QWK_ENUF
top fuel
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top fuel
Joined: Sep 2005
Posts: 2,442
LOWELL IN
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are you runnin the carb in the pic.it looks like an HP holley not a holley with a removed air horn
if so i can send this one for you to test i just need it back by yhe columbus classic
WAXER
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Re: CARB CHANGE EXPECTATIONS??!!!
[Re: Labratt]
#859326
11/22/10 10:37 PM
11/22/10 10:37 PM
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Joined: Sep 2005
Posts: 2,442
LOWELL IN
QWK_ENUF
top fuel
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top fuel
Joined: Sep 2005
Posts: 2,442
LOWELL IN
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holler if you want to try it
WAXER
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Re: CARB CHANGE EXPECTATIONS??!!!
[Re: Labratt]
#859328
11/22/10 11:06 PM
11/22/10 11:06 PM
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Joined: Jan 2003
Posts: 4,852
KENTUCKY
69CHARGERMD
master
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master
Joined: Jan 2003
Posts: 4,852
KENTUCKY
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Found this as i was "researching" the topic,,,,didnt realize it... Quote from the Carb Shop......... Quote:
After all, 950 is more than 850 right? Wrong! In this case, Holley decided to rate their new line of "HP" carbs like their competition does, with inflated CFM figures. They had to. Otherwise no one would buy them because they are more expensive. An HP 950 Holley is a 750 main body with an 850 base. That makes it an 800. You can do the math. The "950," in this case, refers to the CFM potential, not the size of the venturi and throttle blade diameter
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Re: CARB CHANGE EXPECTATIONS??!!!
[Re: QWK_ENUF]
#859330
11/23/10 01:02 AM
11/23/10 01:02 AM
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Joined: Feb 2005
Posts: 5,221
Branson, Mo.
joedust451
super gas
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super gas
Joined: Feb 2005
Posts: 5,221
Branson, Mo.
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Quote:
holler if you want to try it
That looks like & i'm sure it is a "procomp" mainbody with M.Blocks & bowls.
I hope you tried this carb out, i was going to try one of there mainbodies untill i was told to run are far away as possible from a carb builder i know, he said they have the worst casting amaginable, crappy workmenship, he bought one just for s*its & giggles (ya never know right!). you can more or less build a complete carb for 225.00-250.00, whats wrong with this picture  Most if not all procomp stuff is junk.
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Re: CARB CHANGE EXPECTATIONS??!!!
[Re: fast68plymouth]
#859331
11/23/10 01:38 AM
11/23/10 01:38 AM
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Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
BradH
Taking time off to work on my car
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Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
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Quote:
on a stock stroke 440 based combo, especially in a heavy car, if i were to be inclined to use a downleg booster carb, i'd stick with something that had a 1.425-1.450 max venturi diameter.
going from memory here....
Mighty Demon 750 = 1.400
Mighty Demon 825 = 1.425
QFT Q-750 = 1.375
QFT Q-850 = 1.400
QFT Q-950 = 1.450
QFT Q-1050 = 1.590
it can be a challenge to get a large bore, downleg carb to leave hard with a 3.75 stroke motor in a heavy car.
also, sometimes the shift recovery isnt that great either.....although they often make good power on the dyno.
Yep, my Gold Claw is set up w/ the 1.425" venturi / 1.75" baseplate. It made 5-8 HP more on the dyno than my old Holley "950 HP" and was quicker & faster on the track by a comparable amount, too.
I also saw a .2 and 2 MPH improvement on the track switching from a "traditional" Holley 850 to my old Holley "950 HP" and heard from some other people who saw similar improvements w/ the same change. Even though there may not be an outright improvement in HP seen on a dyno, the improvement in shift recovery on the track makes up for it.
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Re: CARB CHANGE EXPECTATIONS??!!!
[Re: Labratt]
#859337
11/23/10 09:29 PM
11/23/10 09:29 PM
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Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
BradH
Taking time off to work on my car
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Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
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Quote:
... Sounds like on a stock stroke 440, the annular would work better!
Only if you can get it to run cleanly down low and not pull too much fuel at high(er) RPM.
Quote:
Kind of hard to believe the annular model would flow 1050cfm. 
That's because it DOESN'T. Annular boosters in a 4150 venturi probably knock off as much as 100 cfm compared to a downleg in the same carb.
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Re: CARB CHANGE EXPECTATIONS??!!!
[Re: Labratt]
#859339
11/24/10 02:32 AM
11/24/10 02:32 AM
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Joined: Mar 2003
Posts: 9,099
Rogue River, OR
Jeremiah
master
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master
Joined: Mar 2003
Posts: 9,099
Rogue River, OR
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Quote:
Jeremiah...on one of your previous posts you said you purchased a 1050 main body..before buying a complete carb. Do you still have the 1050 main body that I could try out??? Was it a downleg..or annular booster model??? Sounds like on a stock stroke 440, the annular would work better! Kind of hard to believe the annular model would flow 1050cfm. BTW...Looks GOOD!!!
All I have at this time is the 1050AN carb. If you wanted to give it a shot I'd be happy to loan it out. All my beater is good for is getting the cops called and people giving me a hard time about it sitting around.
Thank you for the compliment!
Let me know if I can help you out. It's always nice to save eight or nine hundred dollars on a pipe dream.
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Re: CARB CHANGE EXPECTATIONS??!!!
[Re: Labratt]
#859341
11/24/10 12:29 PM
11/24/10 12:29 PM
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Joined: Nov 2003
Posts: 2,131
New Lenox IL
cudadon
top fuel
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top fuel
Joined: Nov 2003
Posts: 2,131
New Lenox IL
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"AND NOW FOR SOMETHING COMPLETELY DIFFERENT!!" Is E-85 available in your area?  It would probably be best to wait til late spring when the ethanol percentages get higher. Plus the tracks will be open and you can have results. But.... I have an E-950 you could test after you sort out your carbs and THEN see what E-85 can do! Don
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Re: CARB CHANGE EXPECTATIONS??!!!
[Re: Labratt]
#859345
11/24/10 02:07 PM
11/24/10 02:07 PM
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Joined: Nov 2003
Posts: 2,131
New Lenox IL
cudadon
top fuel
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top fuel
Joined: Nov 2003
Posts: 2,131
New Lenox IL
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Quote:
Thanks Don! Not sure if e-85 would work all that well in my 10:25 440,especially just running a Holley GPH110 mechanical fuel pump! But....I'm game to give ANY carb a try-out!  Thanks for the offer..would be intriguing,though!
Randy the compr. wouldn't be a problem, but the fuel system may not be up to the 30% volume increase to be safe.
Happy Thanksgiving!
Keep us posted on your results, Don
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Re: CARB CHANGE EXPECTATIONS??!!!
[Re: Labratt]
#859346
11/24/10 02:28 PM
11/24/10 02:28 PM
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Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
BradH
Taking time off to work on my car
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Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
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Quote:
Brad...I believe that! Even if it does decrease it by 100cfm...it would still flow more than BOTH,the 850,and the 950! 
The problem, IMO, is advertised carb "sizes" these days don't seem to match up to actual CFM capabilities. I'd have to dig 'em up, but IIRC some actual wet flow #s that BG provided when the Gold / Silver Claws came out (predecessors to the Demons) showed that the 1.56" venturi w/ annular boosters flowed no more (maybe less?) than a 1.42" venturi w/ downleg boosters.
I've tried the 1.56" w/ annular boosters configuration, which is basically what a Mighty Demon 850 Annular is, and it didn't run any better on the track than the 1.42" w/ downleg config that is listed as an 825, and it actually ran much crappier on the street.
The only way I'd try the annular booster config again w/ a 4150 would be w/ the 1.59" venturi, since that extra .030" in venturi size -- according to that same BG data I mentioned above -- seemed to free up a few CFM.
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Re: CARB CHANGE EXPECTATIONS??!!!
[Re: Labratt]
#859348
11/24/10 09:03 PM
11/24/10 09:03 PM
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Joined: Mar 2003
Posts: 9,099
Rogue River, OR
Jeremiah
master
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master
Joined: Mar 2003
Posts: 9,099
Rogue River, OR
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Quote:
Jeremiah,that's a favor that's hard to pass up!  Like I stated earlier in this post..winter is upon us,and I won't be able to do any dragstrip testing until the spring,but still plan on taking the X down the road on 50*+ days..whether they're in December..February...or April!  I'd really like to have an idea whether the 1050 is going to be feasable in my STREET car that I race..with a goal of going 10's....and still be able to drive anywhere,within a reasonable distance! The 4:56 gears somewhat limit cross-country jaunts,however!  Again..Thank You for your generous offer! I'll PM You my address!
Give me an idea what air bleeds, jets, and PV's, squirter's, etc. you want in it and get me your address. If you want I can send some tune up parts to try as well. Maybe putting everything back to stock will be the best way to go? There is enough ice on the streets here that my car won't move until March. If I need to beat up on the locals on I'll toss on my 850 for some street action. 'Hope you like the smell of 110!
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Re: CARB CHANGE EXPECTATIONS??!!!
[Re: BradH]
#859349
11/25/10 03:33 PM
11/25/10 03:33 PM
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Joined: Mar 2003
Posts: 9,099
Rogue River, OR
Jeremiah
master
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master
Joined: Mar 2003
Posts: 9,099
Rogue River, OR
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Quote:
Quote:
Brad...I believe that! Even if it does decrease it by 100cfm...it would still flow more than BOTH,the 850,and the 950!
The problem, IMO, is advertised carb "sizes" these days don't seem to match up to actual CFM capabilities. I'd have to dig 'em up, but IIRC some actual wet flow #s that BG provided when the Gold / Silver Claws came out (predecessors to the Demons) showed that the 1.56" venturi w/ annular boosters flowed no more (maybe less?) than a 1.42" venturi w/ downleg boosters.
I've tried the 1.56" w/ annular boosters configuration, which is basically what a Mighty Demon 850 Annular is, and it didn't run any better on the track than the 1.42" w/ downleg config that is listed as an 825, and it actually ran much crappier on the street.
The only way I'd try the annular booster config again w/ a 4150 would be w/ the 1.59" venturi, since that extra .030" in venturi size -- according to that same BG data I mentioned above -- seemed to free up a few CFM.
Brad, thank you for giving your insight. It's fun to read your tech info and always helpful for a "poser" like myself. You reasoning is exactly why I decided to try an annular carb over my downleg 850. I also wanted to see if the annular booster ran better on a single plane at 4000' altitude. Carbs do strange things out here in the desert.
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Re: CARB CHANGE EXPECTATIONS??!!!
[Re: Jeremiah]
#859352
11/25/10 06:35 PM
11/25/10 06:35 PM
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Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
BradH
Taking time off to work on my car
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Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
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Quote:
... I also wanted to see if the annular booster ran better on a single plane at 4000' altitude. Carbs do strange things out here in the desert.
I didn't realize K-Falls is that high up. One of my brothers worked in that area for quite a while before ending up in Idaho. Yeah, I'm sure the proper tune for those conditions would be significantly different from what I use here near sea level in the Mid-Atlantic.
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Re: CARB CHANGE EXPECTATIONS??!!!
[Re: Labratt]
#859355
11/25/10 11:04 PM
11/25/10 11:04 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Not sure what the altitude is here,but I know it's nowhere near 4000'!
Randy we are about 950' round figure... the first floor
at Chrysler (CTC) is 930'
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Re: CARB CHANGE EXPECTATIONS??!!!
[Re: Labratt]
#859358
11/26/10 12:56 AM
11/26/10 12:56 AM
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Joined: Mar 2003
Posts: 9,099
Rogue River, OR
Jeremiah
master
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master
Joined: Mar 2003
Posts: 9,099
Rogue River, OR
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OK...I failed my carb measuring/recon mission today. 'Went out to the shop after work to fire up the heater and realized my power wagon was the last unit in the first bay. It dropped so much dirt and dust I was afraid to turn on the forced air heating system in fear of a dust storm. I spent the afternoon sweeping, putting patio furniture in the back room, and cleaning up from the last three rush jobs. Don't you hate it when you have to get cought up to start the next mission? I'll pull the carb off and measure/etc hopefully Saturday. To follow up K Falls is a tad under 4200 and it goes up up up in any direction out of the basin. Brad, we too are looking to get the hell out of here in the next six months so I can't blame your brother. The DA changes so drastically when the sun goes behind the clouds or you pass by a cold mountain run off fed lake it blows my mind. Sometimes you can actually feel the car surge a little and then the cold air comes rushing in the vents. It is really noticeable driving over the Willamette pass during early summer on a 100 degree day when you pass Odel Lake. My theory behind using the annular was two-fold. I was hoping the better atomization of the annual booster would help make the carb more consistent performance wise (pipe dream on my part, right?) and the 1050 main body would be comparable to an 850+ cfm downleg carb. I'll say that I really love that old beater 850, it has righteous throttle response on my combo! 'Sorry about the hold up. I'm hoping Larry with the Blue 4-speed '68 RR chimes in as he runs a QF 1050AN and could provide us with some insight.
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Re: CARB CHANGE EXPECTATIONS??!!!
[Re: BradH]
#859359
11/26/10 12:15 PM
11/26/10 12:15 PM
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Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
BradH
Taking time off to work on my car
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Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
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Quote:
... I'd have to dig 'em up, but IIRC some actual wet flow #s that BG provided when the Gold / Silver Claws came out (predecessors to the Demons) showed that the 1.56" venturi w/ annular boosters flowed no more (maybe less?) than a 1.42" venturi w/ downleg boosters...
OK, found the data I was talking about in that previous post. These are the #s that BG listed for their Gold Claw series in different venturi & booster configurations. All these are w/ 1.75" butterflies, slabbed shafts & CNC venturi inserts:
Venturi -- Booster - 1.5" Hg ==> Model
1.562 --- Annular -- 875 ==> "750"
1.425 --- Downleg -- 980 ==> "825"
1.500 --- Downleg -- 1036 ==> "975"
1.590 --- Annular -- 1017 ==> "950"
1.562 --- Downleg -- 1084 ==> "1025"
The Model designations they used at the time don't make much sense to me. The spec sheet had a footnote saying "Model sizes are based on median flow rates observed on a range of engine sizes and RPMs suited to each carburetor."
Regardless, the point I'm trying to convey is the booster configuration can have a major impact on the effective flow rate of any given venturi size.
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Re: CARB CHANGE EXPECTATIONS??!!!
[Re: BradH]
#859360
11/26/10 01:18 PM
11/26/10 01:18 PM
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Joined: Feb 2005
Posts: 4,313
Prospect, PA
BSB67
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master
Joined: Feb 2005
Posts: 4,313
Prospect, PA
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Regardless, the point I'm trying to convey is the booster configuration can have a major impact on the effective flow rate of any given venturi size.
....and, not all "downleg" boosters are the same either.
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Re: CARB CHANGE EXPECTATIONS??!!!
[Re: BradH]
#859363
11/26/10 11:08 PM
11/26/10 11:08 PM
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Joined: Mar 2003
Posts: 9,099
Rogue River, OR
Jeremiah
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Joined: Mar 2003
Posts: 9,099
Rogue River, OR
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... I'd have to dig 'em up, but IIRC some actual wet flow #s that BG provided when the Gold / Silver Claws came out (predecessors to the Demons) showed that the 1.56" venturi w/ annular boosters flowed no more (maybe less?) than a 1.42" venturi w/ downleg boosters...
OK, found the data I was talking about in that previous post. These are the #s that BG listed for their Gold Claw series in different venturi & booster configurations. All these are w/ 1.75" butterflies, slabbed shafts & CNC venturi inserts:
Venturi -- Booster - 1.5" Hg ==> Model
1.562 --- Annular -- 875 ==> "750"
1.425 --- Downleg -- 980 ==> "825"
1.500 --- Downleg -- 1036 ==> "975"
1.590 --- Annular -- 1017 ==> "950"
1.562 --- Downleg -- 1084 ==> "1025"
The Model designations they used at the time don't make much sense to me. The spec sheet had a footnote saying "Model sizes are based on median flow rates observed on a range of engine sizes and RPMs suited to each carburetor."
Regardless, the point I'm trying to convey is the booster configuration can have a major impact on the effective flow rate of any given venturi size.
Excellent information sir, thank you for sharing!
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Re: CARB CHANGE EXPECTATIONS??!!!
[Re: Labratt]
#859371
12/02/10 12:53 AM
12/02/10 12:53 AM
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Joined: Jan 2003
Posts: 9,146
Now - Port Orange,Fla. Former...
MIKES_DUSTER
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Joined: Jan 2003
Posts: 9,146
Now - Port Orange,Fla. Former...
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GTX currently has a borrowed Bigs Holley 950HP on it! Runs Real strong with it! Unfortunately,won't be able to do any track testing until April or so! I've got a few more carbs being sent to me to try out! One 850,and a couple of ProForm 1050's...one downleg booster...the other an annular booster!
I wish I had some friends that would lend me some carbs like you!!! Ok,I just wish I had friends!!!  LOL
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Re: CARB CHANGE EXPECTATIONS??!!!
[Re: Labratt]
#859373
12/02/10 01:32 AM
12/02/10 01:32 AM
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Joined: Jan 2003
Posts: 9,146
Now - Port Orange,Fla. Former...
MIKES_DUSTER
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Joined: Jan 2003
Posts: 9,146
Now - Port Orange,Fla. Former...
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Thanks Jeremiah! Good to know the baseline set-up! I'll probably have to change the squirters! The 950 has a 37pri. and a 40sec. Won't really know until I try it out! Mike..it REALLY took me by surprise how many GRACIOUS and TRUSTING people are members here! I have personally only met 2 of the 6 loaners! THANK YOU ALL for your HELP...You guys make me VERY PROUD to belong to such a Mopar Brotherhood!
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Cab..I really can't test the carbs out at the track until next spring..when my neck has more time to heal from the surgery! If time's an issue,I can send the 850 back this week. If not,I'd like to test it out in the spring! Please let me know! 
It's all I can do to tune one carb..let alone 2 of them! 
Warsteiner 
