Re: Drag Strip Failure Help Needed

It's a 440 with an 800 cfm Edelbrock (NSS rules). Fresh Engine, dynoed at 501 HP at 5600 rpm. Cam:254/258 607/621solid lifter. 10.5 compression, Edelbrock Performer heads. The car is a '65 Belvedere, 3700# with driver. Fuel system is 3/8, stock tank, Carter P4600 pump (100gph). Torker 2 Intake.

Akron Don Gallimore

From: "tothperformance@xxxxxxxxxxxxxxxx" <tothperformance@xxxxxxxxxxxxxxxx>
To: 1962to1965mopars@xxxxxxxxxxxxxxxx
Sent: Saturday, July 9, 2016 7:24 AM
Subject: Re: Drag Strip Failure Help Needed

Don tell me a little more about what motor yo are running and what you are running it in.

----- Original Message -----
From: Donald Gallimore <dongallimore@xxxxxxx>
To: The 1962 To 1965 Mopar Mail List Clubhouse <1962to1965mopars@xxxxxxxxxxxxxxxx>
Sent: Sat, 09 Jul 2016 06:30:56 -0400 (EDT)
Subject: Drag Strip Failure Help Needed

I can’t make a good run at the strip. Symptom is surging
from the almost from the time I leave the line and won’t run past 3-3,500 rpm
or so. Fuel pressure drops from the recommended 6.5 to 3.5 psi. Engine will usually
cut off down track like it’s out of fuel. I can eventually restart it.
Sometimes it runs enough to get me off the track, again, at the reduced rpm,
other times, it stalls out again and can’t be restarted till I get back to the pits.
This engine and carb made 500 HP on an engine dyno and hasn’t been messed with
since then.

I gone completely though the 3/8” fuel system from the
pickup to the regulator. Was pumping 100 gph out of the pump, 80 gph just
before the regulator and 45 gph at the carb – I upgraded the regulator as a result
of that to no avail. I added filters 9 a 100 micron filter before the pump and
a 40 micron before the regulator.

We did notice that the electric fuel regulator would take 30
seconds or so to get to full pressure or 6.5 psi and did it in spurts. The mechanical
gauge on the regulator was very slow to react. Based on that, our guess at this time is that the Carter P4600 fuel pump is
worn out. The fuel pump I don’t have a spare and I’m hesitant to throw money at the thing and buy another pump without some more rational reason.

We also think that the carb needs rebuilt/replaced. I have a 750cfm Edelbrock
and an 850cfm AED Holley that we will try next time.

Any ideas ?

Akron Don Gallimore

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Please address private email -- email of interest to only one person -- directly to that person. That is, email your parts/car transactions and negotiations, as well as other personal messages, only to the intended recipient. Do not just press "reply" and send your email to everyone using the general '62-'65 Clubhouse public email address. This practice will protect your privacy, reduce the total volume of mail and fine-tune the content signal to Mopar topic. Thanks!

1962 to 1965 Mopar Clubhouse Discussion Guidelines:
http://www.1962to1965mopar.ornocar.org/mletiq.html and http://www.1962to1965mopar.ornocar.com/general_disclaimer.html.
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