[T3] Crate running better...

[Jim Adney]

On 16 Aug 2012 at 20:45, Keith Park wrote:

> Question, if the compression is low because the rings are worn, does the
> compression RATIO start to come down too?  In other words, are worn out
> domies as sensitive to gas octane as good ones?

The functional compression ratio also varies with the RPM and goes up 
as engine speed increases. This is because there is less time for 
leakage and less time for heat to soak into the head and piston 
crown. From the numbers you gave, however, my guess is that you have 
pretty normal P/Cs in there. Otherwise, I'd expect some of your 
pressures to be higher. They never all wear down together. 

What you show looks like a couple cylinders with normal pressure and 
a couple with poor compression.

Any chance you have a borescope at work that you could slip into a SP 
hole and take a look?

-- 
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Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA
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