Diesels
Well, actually, the SMA is supercharged, for starting, and turbo charged for running. It is a super/turbo charged engine.
Vibration shouldn't be anymore of a problem than with any other 4 stroke engine, particulary given the slower RPM's used.
What the folks at Riley told me is that they are waiting for a larger engine. I don't understand why, given that 230 HP for take off is more than the IO-360 (the engine they are replacing) is 210 for takeoff.
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