"ChuckSlusarczyk" wrote in message
...
In article , Roger Halstead
says...
I wonder why they use such a low compression ratio? Even car engines
running regular usually run 8:1. This one is 6.3:1.
It would reduce the stress on the parts, allowing less expensive
materials than a reliable high compression engine.

I guess they can also use lower octane fuel as well.

Chuck


6.3 to 1 is the compression ratio for the Continental A-65, which loves 80
octane avgas when it can find it.