Akron Don,
Yes, as Rich said, I think your problem source is fuel related. As I
read and re-read your list of troubleshooting...it appears you are not receiving
a timely & consistent delivery of fuel. Your fuel pump analysis seems
to be logical. There could be other issues at play such as ignition but
you have not mentioned any issues that hint at reduced spark delivery so I would
focus on the fuel pump. However, unless you can “borrow” another pump for
testing, I would try removing your fuel filters as a restriction test and check
the floats & needle/seat in your carb; as Rich said, a pressure surge could
have messed up your floats...do the “free & simple” diagnosis without
spending money on a new pump first. Gary P.
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.
Sent: Saturday, July 09, 2016 8:46 AM
Subject: Re: Drag Strip Failure Help Needed
Surging is an indication of a lean mixture as a general rule. You
said you have an Eddy carb so I'd check the floats. You need volume more than
pressure with your carb and 6.5psi is max for the Eddy. I always run about
5.5psi for good luck and never had an issue. A pressure surge could've messed up
your floats if your regulator is dubious.
On Jul 9, 2016 10:27 AM, "Akron Don" < dongallimore@xxxxxxx> wrote:
The prior problem was it just stopped pulling past about 5300. Engine
builder and I chalk that up to weak springs and lifters.
This surging is a totally new problem. This new motor, on the dyno, ran
up to 6400 with no problems even at that rpm. New solid lifter cam, springs,
and heads. (Cam specs are home and I'm doing a make up day at the office now).
I'm thinking the extra 100 HP has maxed out the P4600 Carter pump.
Akron Don
Sent from my Verizon Wireless 4G
LTE smartphone -------- Original message -------- From:
'skafouse' via The 1962 to 1965 Mopar Mail List Clubhouse < 1962to1965mopars@xxxxxxxxxxxxxxxx> Date: 07/09/2016
10:57 AM (GMT-05:00) To: 1962to1965mopars@xxxxxxxxxxxxxxxx Subject: Re: Drag
Strip Failure Help Needed
Wasn't this the same problem you had before? Engine wont rpm etc. Is your
tach good? Try disconnecting it could be shorting out your
ignition. In my opinion which im sure ill be told is wrong. You
dont havr enough compression with the aluminum heads. Did you deck the block
and set the quench area correctly. Use the 850 a good 1 inch spacer and
a team G 7534. Just out of curiosity where is the intake valve close at
50?
Sent from Samsung
Mobile.
-------- Original message --------
From: Donald Gallimore
Date:07/09/2016 8:32 AM (GMT-05:00)
Subject: 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
Don tell me a little more about what motor yo are running and what you
are running it in.
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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