[DeTomaso] compression, oil question
JDeRyke at aol.com
JDeRyke at aol.com
Fri Jul 3 16:42:24 EDT 2009
In a message dated 7/3/09 9:18:52 AM, chrisvkimball at msn.com writes:
> I can't imagine what else it could be that would cause the blowby.....
>
Broken or collapsed ring from wear or whatever. A leak-down test may show
more than a simple compression test, especially if the cylinder is already
oil-soaked. Only a teaspoon of oil in a worn cylinder normally picks up a
compression test 50+ psi.
FWIW, after a leak-down test on all cylinders, the results can be:
2%= a fine, tight engine giving max power for the components
used
5%= a normal street engine with miles on it
8%= a worn engine that begs for some attention
10% or more= there's metal missing somewhere in that cylinder
If it is a bad ring and the broken ends have not left a deep scratch in the
cylinder wall, you might get lucky with a carbide ball-hone in a half-inch
drill and a thoroughly cleaned stock piston. Good luck finding ONE ring
set....BTW, an extra #2 ring will not work in #1 position and vice-versa.
Cheers- J Deryke
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