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Old 05-14-2003, 06:15 PM
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Post what is a good fast/initial idle for SBC?

I just finished getting my 327 up and running, and it has a new Edelbrock 4106 Performer carb on it w/electric choke. When I start the motor, it hovers around 2000 RPM's- is that high for the initial idle? Also, will it drop down on its own after some time (and about how long?)?

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CHEV66JB

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Old 05-14-2003, 06:56 PM
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Intial idle should be around 1500 rpms.
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Old 05-14-2003, 06:57 PM
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Chev66, That is a little high. If this is a new engine you should check out knowledge base right here on this site for different ways to break in an engine. I think you should be around 750 to 1000rpms when operating temp is reached.
Let us know how it go`s.
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Old 05-15-2003, 02:53 AM
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When engine is cold and you turn the ignition on; kick the gas pedal once to 'set' the choke. The high seed idle cam will also rotate when the choke is set this way. You should not have to pump the gas to start. Set the high speed idle so that you have about 1500 RPM. The choke will slowly open fully in about three minutes with the factory setting. The time can be adjusted easily if required. The idle will still be high if you haven't 'kicked' the pedal. Once the engine is warmed up enough to idle normally, kick the pedal to reset the fast idle cam. The idle should now drop down to around 900-1000 RPM in Park and will drop to around 700-800 in Drive. If you have a standard trans, the idle will drop down to around 700-800 in Neutral. You may have to re-adjust the throttle stop screw to achieve the RPM you want at idle AFTER the choke has fully opened and you are no longer on the fast idle cam.
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Old 05-15-2003, 04:25 AM
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Thanks guys-

Actually, I knew that for the initial break-in that the motor should run around 2200 RPM, which I actually got to do last week when my throttle linkage wasn't adjusted right 8^] Tonite I have to change the oil, and I'm going to work with the idle. The 2000 RPM just sounded a little high when it first fired up, but didn't know if that was just me or not..

Just to confirm, the "fast idle" screw is the one below the regular idle, right? If I'm guessing correctly, it's the one that points back toward the driver side seat and goes upward on like a 45 degree angle?

Thanks again to all who replied!

Regards,

CHEV66JB
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