wrote in message
oups.com...
Only 650TT? Unless there's serious corrosion or a burnt valve,
there should be no problems with exhaust valves. Why does the engine
need work already?

Dan


Bottom ends on those engines are usually good for 2,000 hours. The tops
start going at 500. Same for any of the small Continental engines and the
O-300. The jugs just don't last.

$500 is a good investment in exhaust valves. After 500 hours they start to
neck down. They aren't sodium-filled like Lycoming exhaust valves, but of
course they don't run as hot either.

I have seen a few of these Continental jugs last as much as 800 hours, but
they are the exception, not the rule.

Now watch and see if someone doesn't jump in here claiming a thousand hours,
and counting, on his cylinders.