My Leyland Workshop Manual quotes the high comp engines (9.0:1) as having a
compression pressure of 175 to 190 lbf/in for European 18V engines for 1976
on. The earlier 18G engines had 8.8:1 and 160 lb./sq.in. Some have
disputed the higher figure saying that 190 represents a significantly higher
comp ratio than 9.0:1, but that is what the book says. Planing the head
will increase the comp ratio, if the engine had been hotted-up before you
got it the head and block could already have been machined, and your planing
of the head has made it even higher.
PaulH.
----- Original Message -----
> Anyway I think I have blown the gasket again. Odd sounds, hard to start
> and when I checked compression bad news. Now when I got the engine I had
> been told that it had a "hot" cam and that it was high compression. When I
> put in the gasket I didn't check compression but today the readings are
> 1-4: 40 psi; 30 psi; 190psi ; 50 psi.
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