Vacuum tool.

[Dbeck002]

Where can one get a tool used to measure vacuum of the engine at idle. Not a gauge that is permanent. i just want a tool to tell me the vacuum reading of the car at idle.

i hear that 25-30 inches of water is normal. am i correct?

 

[MrKwik]

Whats "normal" would probably depend on your cam and other variables. I have a hand held vacuum guage that I think I picked up at NAPA or O'Reiley that works pretty well. I use it to set idle mixture on my carbs. I think my 92 with an E-cam and big valve heads only had about 16" at 900rpm and my 93 with a B-cam is at about 18" if I remember correctly.

 

[jrichker]

Any good auto parts store will have them. Price will range from $20-$30.

See http://www.actron.com/product_detail.php?pid=16176 for more info

Normal engine vacuum at idle will run from 16"-19" at 650-725 RPM. Thers figures are for an engine with a stock cam and no forced induction.

 

[HISSIN50]

One could also use a Mitivac, which has other uses as well.

 

[Dbeck002]

thanks guys.

 

[silverstripes]

Where can one get a tool used to measure vacuum of the engine at idle. Not a gauge that is permanent. i just want a tool to tell me the vacuum reading of the car at idle.

i hear that 25-30 inches of water is normal. am i correct?

It will not pull that much vacuum. The most vacuum that can be pulled here on earth is 26".

 

[90mustangGT]

10" is a good idle factor, but it should increase with higher rpm and low throttle.