holley carb,,,,,too rich???????
Thread Starter
Racer
Joined: Jul 2003
Posts: 401
Likes: 0
From: texas,, at last
holley carb,,,,,too rich???????
guys,
just fitted a holley 600 vac sec carb last week,
it's a brand new carb that has only ran a few times on my camaro,
thing is,,,,,,
i can start the car up in near freezing conditions with no choke and it runs fine,
i have the mixture screws out 1 1/2 turns,
any ideas????
thanks,
neil
just fitted a holley 600 vac sec carb last week,
it's a brand new carb that has only ran a few times on my camaro,
thing is,,,,,,
i can start the car up in near freezing conditions with no choke and it runs fine,
i have the mixture screws out 1 1/2 turns,
any ideas????
thanks,
neil
Safety Car
Joined: Jul 2002
Posts: 3,770
Likes: 3
From: St Louis MO
Re: holley carb,,,,,too rich??????? (camaroneil)
guys,
just fitted a holley 600 vac sec carb last week,
it's a brand new carb that has only ran a few times on my camaro,
thing is,,,,,,
i can start the car up in near freezing conditions with no choke and it runs fine,
just fitted a holley 600 vac sec carb last week,
it's a brand new carb that has only ran a few times on my camaro,
thing is,,,,,,
i can start the car up in near freezing conditions with no choke and it runs fine,
Brett :thumbs:
Thread Starter
Racer
Joined: Jul 2003
Posts: 401
Likes: 0
From: texas,, at last
Re: holley carb,,,,,too rich??????? (Brettmc)
it drives great hot and cold without any choke,
seems to be using a bit more fuel,
i was thinking of pulling the plugs tonight and see what they look like,
neil
seems to be using a bit more fuel,
i was thinking of pulling the plugs tonight and see what they look like,
neil
Tech Contributor
Joined: Aug 1999
Posts: 14,377
Likes: 6,377
From: At my Bar drinking and wrenching in Lafayette Colorado
Re: holley carb,,,,,too rich??????? (camaroneil)
The Holleys are set up just a tad on the rich side, but this is usually not a problem. If you lean them out you will often get into an off-idle stumble problem.
You might do 2 things:
First, check your idle mixture screws. Most stock Holleys will idle best at about 1/2 to 3/4 turn out on the screws. 1-1/2 sounds a bit much, so try leaning it out a tad after the engine has warmed up.
Second, make sure the secondary adjustment screw has been properly set. The primary throttle blades (idle speed screw) should be adjusted so that about .020" of the transition slot in the throttle bore is visible below the throttle blades. The secondary throttle screw then needs to be set to give the secondary blades the same throttle opening as the primary. This will flow a slight amount of air through the secondary side and will assure that your mixture runs correctly.
You might do 2 things:
First, check your idle mixture screws. Most stock Holleys will idle best at about 1/2 to 3/4 turn out on the screws. 1-1/2 sounds a bit much, so try leaning it out a tad after the engine has warmed up.
Second, make sure the secondary adjustment screw has been properly set. The primary throttle blades (idle speed screw) should be adjusted so that about .020" of the transition slot in the throttle bore is visible below the throttle blades. The secondary throttle screw then needs to be set to give the secondary blades the same throttle opening as the primary. This will flow a slight amount of air through the secondary side and will assure that your mixture runs correctly.
Race Director
Joined: Mar 1999
Posts: 10,258
Likes: 1
From: Calif.
Re: holley carb,,,,,too rich??????? (camaroneil)
I think 1 1/2 turns out on the idle screws is just one of those rule-of-thumb, ballpark kind of adjustments--the car will idle like that and it gives you plenty of room for fine tuning. My Holley generally likes its idle screws about 1/2 turn out. (At least that's where they always wind up after I'm done fiddling with it.)
