rpm drop when ac engaged.

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Jul 31, 2011 | 02:26 PM

scyzoryk23

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From: new york city ny

rpm drop when ac engaged.

My idle speed is set up to 900 rpms. When I turn on the ac (compressor clutch engages and my electric fan goes in to HIGH speed) the rpm drops from 900 to around 500 and the car bearly idles.
Any suggestions to fix the problem?
S
Ps. I have build 355 with 6 speed and 100amp alternator.

Jul 31, 2011 | 03:02 PM

scyzoryk23

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From: new york city ny

I forgot to add. I have 670 holley street avanger and 276hr comp cam.

Last edited by scyzoryk23; Jul 31, 2011 at 04:14 PM.

Jul 31, 2011 | 03:08 PM

Manuel Azevedo

Burning Brakes

Joined: Jan 2007

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From: Concord Calif

Quote:

Originally Posted by scyzoryk23

I forgot to add. I have 670 holley street avanger and 282hr comp cam.

What you have is normal. It takes power to turn that compressor and a big load to the alternator when that fan kicks in. In stock form there was a step up solenoid on the carb that would open the butterflies some when the air was turned on. Either fine a stock one or I believe Holley even had one in their acc. cat.

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