Running lean ??
Thread Starter
Racer
Joined: Feb 2003
Posts: 331
Likes: 0
From: El Cajon CA.
Running lean ??
65' vert 327/365, fresh motor,trans,distributor, Holley carb....seems to be running a bit lean- QUESTION: When trying to adjust the "lean-ness" (couldn't think of another term at the moment), which way do I turn the large brass screws on either side of the front bowl of the carb? clockwise or counter clockwise?? Thanks for any replies....
Race Director
Joined: Jan 2003
Posts: 17,693
Likes: 3,682
From: Central Arkansas
65' vert 327/365, fresh motor,trans,distributor, Holley carb....seems to be running a bit lean- QUESTION: When trying to adjust the "lean-ness" (couldn't think of another term at the moment), which way do I turn the large brass screws on either side of the front bowl of the carb? clockwise or counter clockwise?? Thanks for any replies....
Thread Starter
Racer
Joined: Feb 2003
Posts: 331
Likes: 0
From: El Cajon CA.
Recently had distributor/timing dialed in...carb is completely rebuilt and set for the rebuilt motor. When I started the car cold the other day and tried to drive it onto ramps (not warmed up yet) it backfired 2 times thru the carb. Thought that might be a sign of running a little lean........
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Drifting
Joined: Apr 2008
Posts: 1,540
Likes: 51
From: Lexington Park Maryland
Recently had distributor/timing dialed in...carb is completely rebuilt and set for the rebuilt motor. When I started the car cold the other day and tried to drive it onto ramps (not warmed up yet) it backfired 2 times thru the carb. Thought that might be a sign of running a little lean........
Melting Slicks
Joined: Oct 2004
Posts: 3,345
Likes: 87
From: Northern MN
St. Jude Donor '13-'14-'15-'16-'17
One other thought is that the accelerator pump discharge may not be set correctly. The engine will lean out when you step on the accelerator and will backfire until it catches up when the added fuel gets to the cylinders.
Just a thought.
Steve
Just a thought.
Steve
Instructor
Joined: Oct 2005
Posts: 187
Likes: 0
From: TRAILER RENTALS - Florence Twp. NJ
The mixture screws only affect the mixture while the carb is in the idle curcuit ( car idling )........
The plugs should be a light brown when you have your tune up right...[ plugs will be a white color indicating a lean condition].....
Last edited by J.K. Cooley; Oct 21, 2008 at 08:35 AM.
