Bill Freeman:

I strongly disagree with your statement that there is any material difference
(read improvement in either design or reliability) in the engine series you
cited.  ie E-185, E-225 and O-470.

Do you want to discuss the IO-520?

As an addendum I recently priced a set of piston rings for a Lycoming O-290
at a local repair station.  They wanted $1,000.00 for them and a wait of 3
weeks.

There is a racing supplier which produces one off rings sets called Superseal
to your requirements for about $60.00 per hole.  Takes 4 days for delivery.

Did not bother to check a local auto supplier for the price of 4 cylinder
ring sets.

Hank Huddleston

Hank, are those Cummins diesel engine valves really interchangeable with 
the Lycoming valves?

Paul Lamar
 
The AirCraft Rotary Engine NewsLetter.              Powered by Linux.
ACRE NL web site.
http://home.earthlink.net/~rotaryeng/            http://www.linux.org