cam vacuum isues
#1
cam vacuum isues
i recently refreshed an 88 350 tpi and put a slight cam in it. ever since i put the engine in my brake pedal is hard like it has a vacuum leak. open my oil cap and vacuum is in valve covers as well?? possibly intake???? help by the way the car is an 86 iroc
Last edited by black89rs; 09-16-2010 at 03:24 PM. Reason: forgot info
#4
Before you go that route, you may want to check that the valve clearance is correct, cam and ignition timing is correct, and for vacuum leaks, as any of those can result in low vacuum. You mentioned the cam is fairly mild, so that should not cause your problem.
#7
What size cam did you put in? A radical cam will affect the vacuum and you will need a reservoir.
I had a 86 cutlass that I put a 400 SB in it with a radical cam. The brake pedal was hard as a rock until I put a reservoir in it for vacuum. It helped as it allowed you a couple of brake presses before turning hard again. It would soften after building some vacuum.
I am sure it is your cam, sometimes degreeing the cam will help greately.
I hope this helps.
I had a 86 cutlass that I put a 400 SB in it with a radical cam. The brake pedal was hard as a rock until I put a reservoir in it for vacuum. It helped as it allowed you a couple of brake presses before turning hard again. It would soften after building some vacuum.
I am sure it is your cam, sometimes degreeing the cam will help greately.
I hope this helps.
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