well, I've done the no-preheat thing on a 30 degree day and the prop
didn't spin all that fast (barely started). With a preheat on a
20 degree day the prop spins a lot faster. Preheating does something
for my engine.

Ditto that.

We've got the oil pan and cylinder heaters, and a cowl blanket. Pre-heat,
and the thing pops right over. Don't pre-heat, and it cranks like an old
meat grinder.

Which sounds like a friction thing to me. And I guess I always assumed that
friction was a bad thing inside an engine.
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"