Re: Maxium Power Through 6-Pack Induction w/500 inches
[Re: DaytonaTurbo]
#1731245
01/16/15 09:27 PM
01/16/15 09:27 PM
|
Joined: Jan 2004
Posts: 8,637 fredericksburg,va
cudaman1969
master
|
master
Joined: Jan 2004
Posts: 8,637
fredericksburg,va
|
Quote:
How is it that nobody makes a good single plane 6 pack intake?
Try a Weiand S/S intake, tunnel ram-single plane type. End carbs are like the size of a 800 dp and i guess the middle should be close to a 600. So 800 + 300 = 1100 would be more likely, unless those four barrels don't flow what they advertize either. I would say six barrels should flow a lot more than any four barrel except the dominator. Good test for you flow bench guys, just flow half of a four barrel, say an 850 then the six pac two barrel at the same rate to clear the air. ,
|
|
|
Re: Maxium Power Through 6-Pack Induction w/500 inches
[Re: VincentVega]
#1731246
01/16/15 09:33 PM
01/16/15 09:33 PM
|
Joined: Jan 2003
Posts: 28,096 Irving, TX
feets
Senior Management
|
Senior Management
Joined: Jan 2003
Posts: 28,096
Irving, TX
|
Quote:
On a large enough engine, with a big enough draw, who is to say it won't pull 3 inches? or even more? If it does that, then the 1350 capacity is now reality. I would say on a big enough engine, with cam, and high rpm, it should be possible.
So what is the point of the discussion? to talk theory, or application?
It doesn't work that way.
The carbs are rated for flow using specific pressure differences across the throttle. A high vacuum below the throttle will draw more air.
The 2 bbl got its rating with a higher draw. That means you can't compare the numbers directly with a 4bbl.
If tested like a 2 bbl, a 750 CFL carb would get a 1050 rating.
We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind. - Stu Harmon
|
|
|
Re: Maxium Power Through 6-Pack Induction w/500 inches
[Re: Dunnuck Racing]
#1731251
01/17/15 01:33 AM
01/17/15 01:33 AM
|
Joined: Sep 2004
Posts: 6,906 IL, Aurora
ademon
master
|
master
Joined: Sep 2004
Posts: 6,906
IL, Aurora
|
Quote:
Here is an easy way to TRY and explain it. I am building a hot street 440 with a six pack. The carbs are here now. The venturi and butterfly measurements of the two 500 cfm two barrels carburetors is exactly the same as the customers current 850 four barrels. So whatever the 350 carburetor would flow compared to a four barrels is the only gain. I will make a post later about the intake, porting, etc Keith
But isn't the 850dp slabbed throttle shaft with thin throttle blades? And original 6 pack carbs full shafts with thicker throttle plates sandwiched in the middle?
|
|
|
Re: Maxium Power Through 6-Pack Induction w/500 inches
[Re: AndyF]
#1731252
01/17/15 10:18 AM
01/17/15 10:18 AM
|
Joined: Feb 2005
Posts: 4,333 Prospect, PA
BSB67
master
|
master
Joined: Feb 2005
Posts: 4,333
Prospect, PA
|
Quote:
Understanding the 6 pack CFM is one of the hardest things for Mopar guys. A really big percentage of them will never figure out the whole 2bbl flow rating thing. I gave up correcting people a few years back but I'm glad to see that you're still putting up the good fight!
The equiv flow rating of 900+ cfm is enough to make really good power, it is the twists and turns inside of the stock intake that kills the combo. Especially at high rpm and/or lots of cubic inches. But the setup can easily make 600 hp on a healthy short block so it does work really well up to a point. And that point is more power than what 99% of the folks need on a street car anyway.
These comments bundle it up pretty nicely. My limited testing show that a stock 6bbl intake starts to give way to other manifolds above 550 peak hp, and average power not much after that. I'm not suggestion that I won't go 650 hp.
I'm really surprised that carb manufactures have not started to give air flow curves at multiple pressure drops, say from .4" to 2.0" Hg., not that guys like me lower on the food chain would need to know anything much above 1.0" Hg.
|
|
|
Re: Maxium Power Through 6-Pack Induction w/500 inches
[Re: cudaman1969]
#1731258
01/18/15 05:34 PM
01/18/15 05:34 PM
|
Joined: Jan 2003
Posts: 27,421 Balt. Md
383man
Too Many Posts
|
Too Many Posts
Joined: Jan 2003
Posts: 27,421
Balt. Md
|
Quote:
Quote:
How is it that nobody makes a good single plane 6 pack intake?
Try a Weiand S/S intake, tunnel ram-single plane type. End carbs are like the size of a 800 dp and i guess the middle should be close to a 600. So 800 + 300 = 1100 would be more likely, unless those four barrels don't flow what they advertize either. I would say six barrels should flow a lot more than any four barrel except the dominator. Good test for you flow bench guys, just flow half of a four barrel, say an 850 then the six pac two barrel at the same rate to clear the air. ,
I know a guy who runs the Mod Man six pack setup on an Indy headed 440 stroker in a 69 Bee. I have seen him run 10.50's but I really dont know alot about his eng build other then it has Indy parts. I wonder how the Mod Man 6 pk compares up to the stock intake ? Ron
|
|
|
Re: Maxium Power Through 6-Pack Induction w/500 inches
[Re: 383man]
#1731262
02/01/15 12:01 AM
02/01/15 12:01 AM
|
Joined: Jun 2006
Posts: 5,173 CT
GTX MATT
master
|
master
Joined: Jun 2006
Posts: 5,173
CT
|
I usually think of it this way; if the build would be a good fit for a performer rpm it'd be good for the 6 pack. The Eddy 6 pack intake works/worked really well for something designed in 1969.
A buddy has a stock stroke 440 with a 260 @ .050 cam, Super Comps, Indy SRs, etc. 601 horse on the dyno with the 6 pack. He was worried about the engine when he bought the car but it has been reliable as can be. I'd like to see what it'd do with a Victor and an 850 on it.
Now I need to pin those needles, got to feel that heat Hear my motor screamin while I'm tearin up the street
|
|
|
|
|