I think I fixed my vacuum leak, and my gauage now reads like 16 in. per HG at idle. I spoke with a few other people and they said this was a good level, but I just want to double check.

 

i had a similar question before.
do a search on"negative on boost"
danno, explained it clearly on this thread.
goodluck

 

I see that, but that does not tell me what it should read at idle. What does your gauge read at idle?

 

Mine seems to come in 15 inches at idle, and I have been over the car 100 times trying to find any other leak...

 

Good vacuum with a well sealed engine is around 15-22 in.HG (depends upon exact idle-RPM also). If you've got less than 12 in.HG, the engine's getting worn and isn't sealing as well anymore.

 

I get 18 inches HG on my VDO meter at idle (950 rpm). It jumps to 22+ when engine braking. I guess I can stop replacing vacuum line connectors.

 

I get about 14-15 on a cold engine.
18 at idle when warm. 22 on engine braking also.

 

I get about 14-15 on a cold engine.
18 at idle when warm. 22 on engine braking also.

 

17-18 inches here on a warm engine.

 

14-16 here, i guess it's safe to say that my car is running well?

 

18-19 on warm and this was before I discovered I had completely smoked valve guides. How is that possibly?

 

18 at idle here, but im loosing coolant somewhere, and it aint on the damn ground...eek!

 

20 at idle...

hey sam sounds like a new headgasket is in order.How much coolant are you loosing a week? i was just curious cause i have the same problem and i want to know how long i have until i have to change the headgasket myself.....especially since i am pushing 16 psi!!

 

From what I've seen, 17"-19" is what you get with a 951 with a stock cam, engine and tuning in proper condition.

With a big cam, the vacuum should be at about 11"-12", and the engine in good condition tuned properly.

15" is too low on a stock cam 951 engine.

 

what does everyones vacum read when the A/C is turned on...mine goes to about 12?? when off a good 16-18