What is an average vacuum reading?
#1
Three Wheelin'
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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.
#5
Race Director
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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.
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#13
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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!!
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!!
#14
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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.
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.