kevleetee

I am running a carburated Ls1 with a victor jr intake, Z06 spec cam in a 1st gen camaro. I only have 13hg of vacuum. This seems low for such a small cam. I am running stock 98-02 f-body brake mastercylinder and booster and have a stiff pedal like not enough vacuum. Is anybody else running a similar combo with vacuum numbers to compare? I think its a very mild combo to have vacuum problems.

i r teh noobz

iTrader: (4)

I have 18" with a 224/228 112LSA cam 5.3, so I'd say you should have much more vacuum.

I'd start by checking the booster for a bad diaphragm.

bczee

iTrader: (12)

Disconnect everything and plug the ports.. then take a reading.. if still low.. you might have vacuum leaks then.

have you checked for vacuum leaks by spraying carb cleaner at any suspect areas ?

BC

kevleetee

Thanks for the advice gentlemen. I'm specifically looking for others that have used the victor jr. carb intake to compare the vacuum #s.

kevleetee

I finally fixed my problem. I checked leakdown, compression, pressurized my intake to ckeck for leaks and found nothing wrong. The fix was in the carburetor. Seems the deal I got at on a new 750cfm 4150 carb was not so good. I had a lot of slop in the throttle shafts, even though it doesn't have any miles on it. I got a billet throttle plate and put the carb back on and 20in hg vacuum! What a relief. Engine idles so smooth and will idle as low as 500 rpms.

bczee

iTrader: (12)

Great news.. Wish it was the simple for my low vacuum problem.. I know mine is the cam.. LOL