carb spacer ??
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carb spacer ??
what kind of gains would i see with a carb spaser? and what kind do you guys like and why? it would be going on a mild built 390 with headers single 3" pipe edelbrock rpm intake and 670 truck avenger . im just looking for a little more lower end after going with the 35" MTR's
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From: Montana
If you want to keep low end torque use a spacer with 2 holes or 4 holes so left and right sides of intake manifold plenum are kept seperate. Doing this keeps the plenum volume smaller, so vacuum signal felt by carb is stronger. With my rpm manifold I am using a Mr. Gasket 4 hole phenolic spacer to help with the vacuum thing, and insolate the carb from all that heat the aluminum intake soaks up. It almost eliminates the hot start problems and greatly reduces the fuel boiling in the carb during hot soak after engine is turned off. Make sure to use a good electronic igniton system too. It will help from start up to full throttle. JMO, hope this helps.
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thanks FEmtnmax, that is the stuff i was looking for, i do have a good MSD igniton, one more ? how thick is the spaser 1"-1 1/2". also will i gain lowend torque or just keep what i have if i didnt gain in power i problem wouldnt do it because i dont have a hot start
problem.
problem.
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From: Montana
I'm using a 1" spacer. I dont' think you will gain any low end torque, will gain some mid-top end power with larger plenum volume. Sort of like going from 428 cj intake to 428 PI intake with a little more plenum volume. IF you have an open spacer under your carb now you should see an improvement going to the 2 or 4 hole spacer.
Post Fiend
Joined: Mar 2004
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From: Union, Washington
Originally Posted by FEmtnmax
I'm using a 1" spacer. I dont' think you will gain any low end torque, will gain some mid-top end power with larger plenum volume. Sort of like going from 428 cj intake to 428 PI intake with a little more plenum volume. IF you have an open spacer under your carb now you should see an improvement going to the 2 or 4 hole spacer.
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Postmaster
Joined: Jul 2003
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From: iowa
they say the 428cj and pi are physically the same but they are not. The 428cj is 4 hole and pi are divided into 2.
Carb spacers imho, only add plenum volume which helps mid and top range. They claim they help lowend, improve signal draw, etc,etc....
Carb spacers imho, only add plenum volume which helps mid and top range. They claim they help lowend, improve signal draw, etc,etc....
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From: Montana
FordPower is right about the 2 hole and 4 hole difference. I have a C80E CJ intake, and a C6AE-H PI intake. The PI stands a little taller at the carb mounting flange. Maybe about 1/4 inch taller or a little more. I measured the plenum volume for one side of each intake. The Cj held 2000 cc and the PI held 2100 cc if I remember right. I'm not where my notes are.
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