Can "Lexan" be used to stuff a crankcase in a Homelite motor. The specs I found say it is ok up to 280 degrees F. I don't think the cankcase would get hotter than this, am I wrong?

It would probably be alright, but if it warps the crank is going to smack it and make a mess. Better to use aluminum.

AV8TOR

Didn't think about warping [&o] Well that's what forums are for. Thanks av8tor

That Homelite's a 2-stroke, right? Constant fresh charge through the crankcase, should remain under about 180F. A fourstroke, on a hot day, oil might reach 250F.

Lexan is used for windows into prototype engines regularly. Lots of small screws (with flat washers) around the perimeter, about 2cm spacing between screws. Use RTV sparingly to seal.

Good luck,
Dave Olson

The "plug" that is in the motor now has a slight taper on it, making it narrower than the crankcase. I had planned on cutting the lexan to fit the crank case, adding JB Weld and a screw to the back, then filling in the void made around the original "plug". So in theory the Lexan would be held in place around the edges with the epoxy.

Aluminum will work great and last forever, Lexan may not.

Why risk it?

What do you guy's mean by stuffing the crack case. What does it do?[&:]

Basicly stuffing reduces the volum of a crankcase and improves air flow.

In general you leave just enough room for the crank shaft to rotate.