Whats the compression roughly supposed to be on a 2.5 fully forged engine ?
cause mine is reading around 152 ish give a little !
is this about right ?
thanks in advance

 

All depends on what compression ratio the forged engine was built with.
Factory spec for a standard engine is around 142 ~ 171 psi, with a minimum of 128 psi and less than 7 psi difference between the cylinders.

Mick

 

difference across them is the more important figure to worry about.