a litte Holley help please
Thread Starter
Pro
Joined: Jan 2002
Posts: 624
Likes: 0
From: Marietta ga
a litte Holley help please
since i got my car it has never totaly accelerated smooth... untill today..... after countless trial and error i dialed in the mixture screws and adjusted the float level.... and this time it finaly worked pretty good..... next is the accerator pump....and jets and so on.... Anyways my question is regarding the idle mixture screw.. i have read on a post that you start at 1 1/4 turn and then adjust from there.... I have mine at about 7/8 of a turn out.... do you guys think that is too little.. i am just scared it might be running a bit too lean and i don't want to crack a piston or do any other damage associated with lean condition. What is the best method of adusting the mixture scews? the way i did it was turing them in untill the RPM's started to drop then i turned them out about a 1/8 a turn or a little less... what do you think? :seeya :chevy
Thread Starter
Pro
Joined: Jan 2002
Posts: 624
Likes: 0
From: Marietta ga
Re: a litte Holley help please (Cory1970)
Help... I need somebody... help... not just anybody... help... won't you please please help me...... (beatles)
Come on guys...... there has got to be a holley expert around here somewhere
Come on guys...... there has got to be a holley expert around here somewhere
Le Mans Master
Joined: Aug 2000
Posts: 6,362
Likes: 7
From: Brazos TX
Cruise-In IV Veteran
Cruise-In V Veteran
Re: a litte Holley help please (Cory1970)
The 1 1/4 turns is just a baseline to get you started. You have used the correct procedure to set the idle mixture. 7/8ths does seem like it's too little but if the throttle blades aren't open too far (about .030" of the transfer slot showing) and the power valve is correct (1.5 to 2" of vacuum rating below idle vacuum) then things should be cool. Check your plugs if you are still concerned. If they look white or things are melting, enrichen it a little.
Racer
Joined: Apr 1999
Posts: 422
Likes: 3
From: Oxford MI
Re: a litte Holley help please (redwingvette)
remember, these are "idle" mixture screws. They only influence the air fuel ratio when the idle cicuit is in action. My experience has been that most Holleys seem to run better coming off idle when you are set a touch on the "rich" side, which means you could set highest and steadiest vaccum at idle and then go 1/8 turn more open or rich.
Advanced
Joined: Aug 2002
Posts: 52
Likes: 1
From: MA
Re: a litte Holley help please (Cory1970)
check out this link, it has lots of tuning info on holley's http://www.bob2000.com/carb.htm
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Safety Car
Joined: Feb 1999
Posts: 3,631
Likes: 14
From: Fountain Hills AZ
Re: a litte Holley help please (Cory1970)
Cory, the manifold vacuum port is on the front passenger side of the carb below the metering block. If you have vacuum advance connected to it and want to have vacuum advance while you make the adjustment you'll need to install a tee.
