All;
-My personal experience & my HOLLEY service manual states there is
supposed to be a "little" space between the Accel. pump lever &
adjusting nut. I've run anywhere from .040" to .080" depending on
track conditions. Take off the air cleaner and manually tweak your
throttle. If you have it snug, just a miniscule amount of throttle
change constantly dribbles in gas...not good for mileage and fouls
plugs sooner with lots of stop-and-go traffic. HOLLEY also sells
many different tension springs and diaphragms to dial in your
accel. pump(s) properly.
-Another area to check is POWER VALVES. They come with different
numeric set points to open at different vacuum settings. Buy 3-5
& experiment with them.
-A good friend of mine in the '70's had a very succesful bracket racer
we ran at Fremont dragstrip every Wednesday during "grudge-racing"
season. (A Smokey Yunick 1/8" stroked 350 in a '55 Studebaker!!)
Times were consistently 12.50-12.70. This was an every day driver & got
15-20 miles/gallon on the highway. I spent LOTS of time dialing in the
850 cfm we ran.
Phil
______________________________ Reply Separator _________________________________
Subject: Re: carb question
Author: Doug Pruitt <dopruitt@ENH.NIST.GOV> at ~INTERNET
Date: 4/11/96 6:07 AM
At 04:07 PM 4/10/96 -0700, you wrote:
>I've just managed to figure out that my car came with a 600 cfm Holley
>4-barrel. I think that might explain why the engine wants to bog down
>when I start out in first, and also why it stumbles on occasion when I
>stick my foot in it at low RPMs.
>
>I've can get a good deal on a 450 CFM Holley, and am wondering if I
>ought not just go ahead and swap rather than trying to make the 600 CFM
>work better. Any thoughts?
>
>Also, I've got a weird speedometer problem. The speedo doesn't
>register, but when I disconnect the cable, I can see it turning when
>the car is moving. I also can make the speedo register with a variable
>speed drill. But when I connect the cable to the speedo, it doesn't
>work. I've got a spare speedo, which also works with with the drill,
>but it doesn't work when i hook up the cable. So, I've got two speedos
>that appear to work, and a cable that appears to work, but, hook 'em
>up, and no dice. What gives?
>
>Joe
If it is a vacuum secondary (eg. list 1850) make sure the
accelerator pump is working and adjusted properly. It must be checked every
time the front float bowl is removed. There must be no slack between the
spring loaded adjusting bolt and the lever on the accelerator pump, but it
should just touch so that you get full travel of the lever.
I had a speedo cable that was to long for its housing and it would
push the spinning disk forward until it jammed. Perhaps I was missing a
gasket or something in the housing. Has anyone else had a similar problem?
Doug Pruitt (301) 975-6419
Maryland
Narf! Zort! Poit! Gat! Fjord!
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