Rockchester Carb
Dr. Detroit
Joined: Mar 2012
Posts: 10,097
Likes: 4,027
From: New Braunfels Texas
Tech Contributor
Joined: Aug 1999
Posts: 14,380
Likes: 6,391
From: At my Bar drinking and wrenching in Lafayette Colorado
Bench-setting of the cold fast idle is as follows (as outlined in my Q-Jet Setup Paper):
Fast Idle Bench Setup
The fast idle screw is located on the passenger side of the carb, on the primary throttle shaft just below the choke linkage. An initial fast idle setting can be done as follows:
You don't adjust the screw by turning it counter clockwise. That would turn it out, eliminating fast idle. The screw is turned clockwise for fast idle adjustment.
Lars
Fast Idle Bench Setup
The fast idle screw is located on the passenger side of the carb, on the primary throttle shaft just below the choke linkage. An initial fast idle setting can be done as follows:
- Back out the idle speed screw on the driver’s side of the carb 3 full turns.
- Crack the throttle open and rotate the fast idle cam so that the cam follower is on the top (fastest) part of the cam (simply lift the cam all the way up).
- Hold the throttle blades firmly closed and back the fast idle screw out until the cam follower just barely looses contact with the fast idle cam. Find the adjustment point where the follower just barely touches the cam with the throttles fully closed. From this point, turn the fast idle screw in (clockwise) 2-1/2 turns.
- Re-establish your driver’s side idle speed screw by turning it back in 3 turns to the original setting.
- Start the engine cold and fine-adjust your fast idle screw to the fast idle speed of your preference. A good fast idle speed is 1250 rpm.
Lars
Last edited by lars; Jul 26, 2019 at 09:50 PM.
Tech Contributor
Joined: Aug 1999
Posts: 14,380
Likes: 6,391
From: At my Bar drinking and wrenching in Lafayette Colorado
I'm not getting the joke on the "Rockchester" thing. Never heard anyone call it that before, and I've been in this business for almost 50 years now. Is that a new slang thing that I should be hip to..? Or is that what you guys are calling them out on the East Coast now..?
Lars
Lars
