Carb Spacer Advice?
Thread Starter
Melting Slicks
Joined: Nov 2000
Posts: 2,738
Likes: 53
From: Bogart GA
Carb Spacer Advice?
I have been running a 2" 4 hole spacer with a 750 Holley on a Edelbrock RPM air Gap manifold. I swithed to a 1" open plenum type but it seems I lost a little punch in the off idle acceleration. Any advice?
Drifting
Joined: Dec 2002
Posts: 1,946
Likes: 28
From: Long Beach CA
Makes perfect sense. You were sucking air through those individual holes in the spacer, so you had a fairly high air velocity through the carb and into the runners at idle. That helps to keep the fuel droplets in suspension. Now you have a big open chamber under the carb. Air velocity at idle is lower, and I would bet the fuel is not staying in suspension as well. An open chamber spacer like that is great at high rpm, but hurts the low rpm.
Thread Starter
Melting Slicks
Joined: Nov 2000
Posts: 2,738
Likes: 53
From: Bogart GA
I have an air/fuel ratio meter and I noticed that when I gun it, it briefly goes lean. It did not do that before. I will purchase a couple of jet sizes up and play with it a bit. I like the low end punch for around town but would like to pick the top end some as the car will see some track time as well. Thanks!!
Thread Starter
Melting Slicks
Joined: Nov 2000
Posts: 2,738
Likes: 53
From: Bogart GA
Originally Posted by Mr Fanuc
What hood are you running? Just wondering because I plan to put an air gap RPM on mine with no spacer and figure to only have about 3/8" between air cleaner cover and hood.
