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Quick Fuel Carb 750 Annular ON A 318
#1350373
12/12/12 03:44 PM
12/12/12 03:44 PM
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Joined: Sep 2012
Posts: 82
Cape Coral
65 DODGE POST
OP
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OP
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Posts: 82
Cape Coral
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I am running an odd ball setup....but wanted to try it anyway. Last month I ported my stock exhaust manifolds and ran the car with a vacuum secondary 650... The outlet on my exhaust manifolds were 1 3/4"  The largest jets I had were 73 primary 78 secondary...went 13:90 @97 MPH. So I coughed up the $$ and bought some TTI headers and opened up the flanges a little to match my W2 ports. These are 1977 heads with the stock exhaust bolt pattern only. I also bought a 750 annular carb. I found out from others that I should probably lean the carb out so I went with 70 jets front and 78 rear.... Took it to the track and it ran a low 14 at 75 mph....surging...( I should have got out of it, but you know how it is) I switched to 83 rear jets and tried again and got 94 MPH out of it. Testing was over...drove home bummed out, and threw some 72 jets in the front on the way home....felt a little stronger... Having read everything off the internet with annular boosters I was thinking I did not have to jet up....but with a large intake with a 3/4 spacer ( Nitrous) large runners from the W2's and only 322 cubes I did. Installed 76 jets front and 87 rear took the car for a ride and it felt like it had 75 more horse...A little closer to what I'm used to. I still felt a little lean miss from 5000 to 6200...but it pulls strong from 3500 to 5000... I am just going to reduce the HSAB from .031 to .029 and try that. Tracks are closed by me and I do not have a wide band.. I really want 400 horse out of this little guy... I have seen 4 or 5 other builds with less head make 400 ponies... It feels like it has about 350 right now.... My last two cars ran high 11's and this one just doesn't feel that strong yet...But to try and get it there with a 318 is fun. 
Last edited by Jims340; 12/12/12 05:02 PM.
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Re: My New Quick Fuel Carb 750 Annular
[Re: Dragula]
#1350375
12/12/12 05:51 PM
12/12/12 05:51 PM
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Joined: Sep 2012
Posts: 82
Cape Coral
65 DODGE POST
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Cape Coral
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Makes sense..helps explain my larger jets a little also.
65 DODGE CORONET 440 INDY EZ HEADS STRANGE S60
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Re: My New Quick Fuel Carb 750 Annular
[Re: 65 DODGE POST]
#1350379
12/12/12 06:21 PM
12/12/12 06:21 PM
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Joined: Jan 2003
Posts: 11,725
Portage,michigan
B3422W5
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 11,725
Portage,michigan
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Quote:
Quote:
I wouldn't mess with the HSAB until you get the WOT jetting correct. It's not there at all if it's falling off above 5000.
Fuel delivery a possible issue?
Yes it is actually....stock ( NAPA ) mechanical pump 6.5 psi at 23 gph....It fills the bowls pretty quick.....but it's definitely not enough....I was just doing first and second gear pulls....but I bet that is my problem.
if you are using a stock fuel tank it could also well be you are uncovering the pickup while racing it.
I made the mistake one time at a big event having the tank only half full( compared to the normally topped off) and the car died about 1/2 track, let off and it would pick up again.This with a stock tank and 3/8 pickup.
Check that as a possible issue, it could be the mechanical pump the previous poster mentioned as well, but that seems more unlikely to me, but its certainly possible as well.
69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight
418 BPE factory replacement headed stroker, 565 lift solid cam
Best so far, low 10.30’s 1/4
1.41 best 60 foot
6.56 at 104.17
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Re: My New Quick Fuel Carb 750 Annular
[Re: B3422W5]
#1350381
12/12/12 06:28 PM
12/12/12 06:28 PM
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Joined: Sep 2012
Posts: 82
Cape Coral
65 DODGE POST
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member
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OP
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Cape Coral
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if you are using a stock fuel tank it could also well be you are uncovering the pickup while racing it.
I made the mistake one time at a big event having the tank only half full( compared to the normally topped off) and the car died about 1/2 track, let off and it would pick up again.This with a stock tank and 3/8 pickup.
Check that as a possible issue, it could be the mechanical pump the previous poster mentioned as well, but that seems more unlikely to me, but its certainly possible as well.
You know what....It did cut out on me at the track in 3rd gear....with less than a 1/2 tank. Thank you for this tip. I could not figure it out....I was thinking to my self this thing can't be sucking that much fuel that the pump cant keep up for 13 seconds?
I have a brand new 1/2 inch pick up and a 3/8's pick up to install. I'm not sure which one I should install... I was going to wait to get an electric pump and install everything at once.
65 DODGE CORONET 440 INDY EZ HEADS STRANGE S60
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Re: My New Quick Fuel Carb 750 Annular
[Re: 65 DODGE POST]
#1350382
12/12/12 06:30 PM
12/12/12 06:30 PM
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Joined: Jan 2003
Posts: 5,444
Indiana
YO7_A66
master
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master
Joined: Jan 2003
Posts: 5,444
Indiana
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If you are starving it at the top end due to the fuel flow, then you may need to rejet again after you have the proper fuel flow.
When my fuel pump was going bad, It was going lean on the top and I could not put enough jet in it to change the A/F at WOT. Then once I found the fuel pump problem, it was too rich and I had to jet it back down.
Are your float levels in the middle?
Glad to see that it is running better for you!
1970 YO7 A66 [Canadian Export] F8 Challenger
340 (Currently in shop for stroker assy.)
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Re: My New Quick Fuel Carb 750 Annular
[Re: 65 DODGE POST]
#1350385
12/12/12 07:08 PM
12/12/12 07:08 PM
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Joined: Aug 2003
Posts: 43,285
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,285
Bend,OR USA
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Quote:
Quote:
If you are starving it at the top end due to the fuel flow, then you may need to rejet again after you have the proper fuel flow.
When my fuel pump was going bad, It was going lean on the top and I could not put enough jet in it to change the A/F at WOT. Then once I found the fuel pump problem, it was too rich and I had to jet it back down.
Are your float levels in the middle?
Glad to see that it is running better for you!
That is what I'm thinking..... I bet the jetting is real close I'm going to wait till I install the new line and pump.
Floats are in the middle...Thanks for all your help Dave....
Since I'm going to spray this thing I am going to get a HP holley electric pump with a regulator... 3/8 line with either a 3/8 sending unit or 1/2 "
Dude, your hooked on going fatser now so put the 1/2 pickup and line on it now  Also make sure and buy the correct electric fuel pump, not one that might work  Way cheaper to do it once than to do it over and over, like some of us dummys   Don't start with a Holley or Mallory 140 or 140 pump, jump up and put your big boy pants on and buy a 250 or bigger pump to start with I like and use Magnfuel pumps, make sure and follow there instructions on line size a fuel filer micron size and location also IHTHs
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: My New Quick Fuel Carb 750 Annular
[Re: 65 DODGE POST]
#1350387
12/12/12 07:17 PM
12/12/12 07:17 PM
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Joined: Jan 2003
Posts: 6,266
Renton Washington
Triple Threat
master
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master
Joined: Jan 2003
Posts: 6,266
Renton Washington
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I went 12.30@107 with stock tank, pick up and fuel lines in a /6 car. Only change was a Carter fuel pump. Other people have gone much faster. Change the pump and try again.
-Dustin
67 Dart, 9 second, 392" G3 Hemi
68 Barracuda 340 F/SA
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Re: My New Quick Fuel Carb 750 Annular
[Re: 65 DODGE POST]
#1350389
12/12/12 07:22 PM
12/12/12 07:22 PM
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Joined: Jan 2003
Posts: 11,725
Portage,michigan
B3422W5
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 11,725
Portage,michigan
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Before you throw a lot of money at it, next time at the track just make sure your tank is completely full, so as to help eliminate the fuel slosh problem.
Jets can effect the tune , no doubt about it, but the issue you are having is more catastropic than jet changes alone would make..unless something is ultra wrong with that carb..float adjustment way off, etc, etc
Btw, it wont matter at your current power level which pickup you install,( i went mid 10's with a 3/8 pickup and stock tank) but understand, no matter the pickup size, if its getting uncovered by slosh, it will cut out on you. Your fuel line going to the engine is still gonna be the same size, and the bowls are still gonna be the same size, as are the needles and seats
69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight
418 BPE factory replacement headed stroker, 565 lift solid cam
Best so far, low 10.30’s 1/4
1.41 best 60 foot
6.56 at 104.17
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Re: My New Quick Fuel Carb 750 Annular
[Re: 65 DODGE POST]
#1350391
12/12/12 07:30 PM
12/12/12 07:30 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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Quit guessing... when doing ANY TESTING you need some gauges to verify what is REALLY happening... put a gauge on the fuel before the carb... tape it to the windshield if you need to... see if you are running out of fuel... also that carb has a .110 needle and seat so after you test with a gauge it will either so a big pressure drop with your currant set up or it wont and if it shows good pressure change to a .120 N/S 
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