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Author Topic:   Few Cleavland questions
Wulfgar
Gearhead

Posts: 193
From: SAn diego, CA, USA
Registered: Oct 99

posted 11-11-2002 12:00 AM     Click Here to See the Profile for Wulfgar   Click Here to Email Wulfgar     Edit/Delete Message   Reply w/Quote
Couple things I would like your opinions on guys. I fixed a backfiring problem I was having caused by to lean of a mixture. But I am still getting sluggish response from out of the hole(hesitation before pickup is noticable).
At the moment Im running a holley 750 DP w/mechanical secondaries and what I beleive to be properly functioning 30cc accelerator pumps(they may not be though, gas kinda has a tendency to dribble out of em on acceleration testing and there is slight hesitation). Im running a stock fuel pump(could this be the problem?) on a modified 351C 2V. Good amount of work done to the engine and heads to increase flow.
Ive advanced the timing a little. Im currently running 38 degrees of total timing with 12 initial. Comp Cam is .510"/.536" 214/224 {292/302}. So it is pretty hot. Intake manifold is the Weiand Xcelerator 2V.

So questions are thus. What psi electric fuel pump should I run to properly fuel this car(I was thinking the Holley "red" P/N 12-801 which is rated at 7 psi and 97 GPH)? But Im open to suggestions. Also, What can I do to help with the hesitation? New accelerator pumps(50cc)? Any other ideas? What may cause this?

Thanks guys

nick

[This message has been edited by Wulfgar (edited 11-11-2002).]

[This message has been edited by Wulfgar (edited 11-11-2002).]

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64FalconF-16
Gearhead

Posts: 191
From: Republic Of Texas!! Temporarily living in KY
Registered: Feb 2002

posted 11-11-2002 07:43 AM     Click Here to See the Profile for 64FalconF-16   Click Here to Email 64FalconF-16     Edit/Delete Message   Reply w/Quote
You need a Holley Blue. Or better yet a Black. The Red will not give you enough on the top end and will run your engine lean.
If you don't like the noisy Holley fuel pumps get a 140 Mallory. You will need a fuel pressure regulator for any of these except the Red.

I would put a 50 on the secondaries and leave the 30 on the primarys..

Do you have a vacumm leak? That would be where I would start.

------------------
64 Pro-Street Falcon
351C 4V 8.1s in 1/8
79 Ford Bronco 4 X 4 Lifted 6"
400 9.9s in 1/8 :)
70 Plymouth Cuda'
440 Magnum. 2600#
Race Car 6.90 in 1/8

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Clevo377
Gearhead

Posts: 312
From: Blackburn, Victoria, Australia
Registered: Nov 2000

posted 11-13-2002 05:13 AM     Click Here to See the Profile for Clevo377   Click Here to Email Clevo377     Edit/Delete Message   Reply w/Quote
Try increasing your shooter size.

Paul

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Dusty Kiser
Gearhead

Posts: 126
From: Bethel,Oh USA
Registered: Mar 2002

posted 11-14-2002 08:39 AM     Click Here to See the Profile for Dusty Kiser   Click Here to Email Dusty Kiser     Edit/Delete Message   Reply w/Quote
Wulfgar. There is absolutely no reason in the world why a good stock pump can't supply enough fuel for your engine. It sounds like your problem is on tip-in anyway, so unless your float level is way too low, should not have a dramatic efect on performance. You say gas is dribbling out on the squirters on accelleration testing? Do you mean with the engine running? The fuel may be broken up by the air stream and appear different. You don't need the engine running to check accellerator pump performance and squirter volume. there are so many adjustments that can be made to your DP to change response characteristics, unless you know what you're doing, you can jack it out of sight. Sounds to me like too much cam for the convertor and gear vs vehicle weight. You can compensate by introducing a lot of fuel at low speed to cover lean condition caused by low signal (pressure equalization between carb boosters and float bowl). 50cc pumps front and rear with proper cams and larger squirters, proper size power valves and main jets. You may want to hire an expert to help. Godd luck.

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Wulfgar
Gearhead

Posts: 193
From: SAn diego, CA, USA
Registered: Oct 99

posted 11-15-2002 02:07 AM     Click Here to See the Profile for Wulfgar   Click Here to Email Wulfgar     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by Dusty Kiser:
Wulfgar. There is absolutely no reason in the world why a good stock pump can't supply enough fuel for your engine. It sounds like your problem is on tip-in anyway, so unless your float level is way too low, should not have a dramatic efect on performance. You say gas is dribbling out on the squirters on accelleration testing? Do you mean with the engine running? The fuel may be broken up by the air stream and appear different. You don't need the engine running to check accellerator pump performance and squirter volume. there are so many adjustments that can be made to your DP to change response characteristics, unless you know what you're doing, you can jack it out of sight. Sounds to me like too much cam for the convertor and gear vs vehicle weight. You can compensate by introducing a lot of fuel at low speed to cover lean condition caused by low signal (pressure equalization between carb boosters and float bowl). 50cc pumps front and rear with proper cams and larger squirters, proper size power valves and main jets. You may want to hire an expert to help. Godd luck.

Without the motor running the streams from the accelerator pumps are strong. But like I said..there is still some slight hesistation on the tip-in. I think maybe Ill write holleys tech guys a letter telling them my current set-up and see what those guys reccomend as far as the size of the cam, squirters, main jets and my power valve.

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