whats the psi of a stock motor in good shape or recent topend job? and at how many psi should you get worried and check things over?
compression question
- Thread starter borednstreched
- Start date
On the gf's old blaster i built and traded for my shee i got 137psi on a .050 wiseco and stock gaskets.
Id settle for nothing less than 120psi on a new rebuild.
Id settle for nothing less than 120psi on a new rebuild.
Agree with above^^^^^^^^. A good rule is to compression test your motor before you fire it up, after break in they usually gain a few PSI when the rings seat properly, and then i check at least once a season. You should re ring when you get 10% less of what you started with.
Example new build is 130 PSI, 10% of that is 13 , 130-13= 117 should put new rings on!
Example new build is 130 PSI, 10% of that is 13 , 130-13= 117 should put new rings on!
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As a rule of thumb (BUT IM PARANOID) i do a compression test any time ive messed with jetting,modded anything on the engine,when i do a tune up.
I probably go overboard with them but a compression test and the the plug are like looking glasses into the engine and how it is running and will tell you alot.And since i have to work for,buy,build and maintain my own toys i dont take any chances.
Compression tests take far less time than a rebuild.
I probably go overboard with them but a compression test and the the plug are like looking glasses into the engine and how it is running and will tell you alot.And since i have to work for,buy,build and maintain my own toys i dont take any chances.
Compression tests take far less time than a rebuild.
