is 20 vac. normal?
 

hey everyone when my car is idle the boost/vac gauge reads 20 vac..is that normal? so far the from the feed back i got ive been told that 10-12 vac is the norm :-\

Re:is 20 vac. normal?
 

Mine reads 20 at idle

Re:is 20 vac. normal?
 

20 is normal.

Re:is 20 vac. normal?
 

thanks guys

Re:is 20 vac. normal?
 

20 here too 8)

Re:is 20 vac. normal?
 

I get 21 at idle (750rpm). I think the more vac you have, the better your rings are (someone told me this), any truth to this?

Stan

Re:is 20 vac. normal?
 

Damn you for breaking the chain! We are all at 20!

Re:is 20 vac. normal?
 

I'm at 10 but I'm autometer gauge is way off :P

Re:is 20 vac. normal?
 

I'm at 18 but my idle is messed up :D

Re:is 20 vac. normal?
 

i would like to know also

Re:is 20 vac. normal?
 

Im at 24 on a 40k block. But its got a spun bearing now.
Idle at 750. Y8 block/Y7 head

Bro's Gsr is 24 also at 750-800.

Re:is 20 vac. normal?
 

yep 20 here

Re:is 20 vac. normal?
 

was at 16 vac 2 days ago and now 21 vac after valve adjustment

Re:is 20 vac. normal?
 

21-22 at idle, 24 on decel...use to be 20 all the time till i broke a piston...then it started pulling more vaccum? even with new pistons....Autometer gauges are gay (but damn for the price a couple inchs/PSI +/- who cares?) ...

Re:is 20 vac. normal?
 

I've heard that aggresive cams give a lower vac reading. ???
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Re:is 20 vac. normal?
 

Really ?

Why do you think all the big cam V8 guys get electric vacuum pumps to run power brakes ?

Re:is 20 vac. normal?
 

i've got 14 on mine, maybe my valves need an adjustment ???

Re:is 20 vac. normal?
 

is it just me or it happend to all the autometer boost gauges.
in hot weather the needle always stays BELOW 0 with the engine off
in cold weather the needle always stays ABOVE 0, the colder it is the futher it gets, this few day it sits at like 2 to 3 psi with the engine off. so my idel reads like 17 inches. (but it is still 20 after u do the math :P)

Re:is 20 vac. normal?
 

I'm not a "big cam V8 guy" so I don;t know. :P
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Re:is 20 vac. normal?
 

Haha.

Well if you were.. lol

Yea anyway. When I get my 272 cam for my y7 head ill let you all know the difference.