The cylinder bores are steel. You might pull all of your plugs (top and
bottom) and rotate the prop by hand so you can get a good look at the
pistons and part of the cylinder walls. Shining a flashlight through one
plug hole and looking through the other hole works pretty well.

The obvious place for aluminum is the pistons or the piston wrist pin caps,
and you cant see the caps without pulling the jug.

KB


"Robert M. Gary" wrote in message
om...
I've had slightly high aluminum for the last year. I'm not happy about
it but everyone says its not high enough to spend real money pulling
cylinders or boroscoping. I'm curious what the group thinks...

IO-360-A3B6
SFNEW 682
At each 50 hours change I've had...
7, 10, 25, 13 (short sample), 24, 23 ppm

I don't think I have an alumimum dip stick (at least my A&P says I
don't). I'm not finding anything in the filter.

I'm in California so everything is pretty pricey. Should I spend a
grand or so having the cylinders boroscoped?

-Robert