<<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>>
          <<  Lancair Builders' Mail List  >>
          <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>>
>>
The problem with early Continental cylinders is related to oil control ring
tension.  Too little oil is allowed to lubricate the upper cylinder.  This can
be confirmed by Low oil consumption and increasingly  high nickel and iron oil
analysis in the initial stages of use.  Later, oil consumption rises,
compression goes down.  My last two flights on the old cylinders were /3 hours
-1 quart  / 2:45 -10 quarts.

Compensating for this by running full rich seems to be a method of choice by
some. Excess fuel will provide some lubrication. Another method might be to
use Marvel Mystery Oil in the fuel.  Or perhaps, the extreme measure of
pulling the cylinders, and changing the oil control ring.  

Continental has redesigned its cylinder manufacture.  It is a much better
cylinder than the original for several reasons.  Including a lowered oil
control ring tension!

My "old design" cylinders operated 532 hours.  The cylinders were worn
out/past service limits.  My "Top Care" cylinders are going past 500 hours,
and having good oil analysis/compression readings.  I fully expect them to
make TB0.

Charlie Kohler