wrote

3600 or 3800 RPM on the highway is a LOT different than
3600-3800 in the air. The highway vehicle is using about 25-35% of its
power capacity. Its throttle is maybe half open at the most. Check
yours again and see. In the airplane, 75% is more like it and the
throttle is three-quarters of the way open.

Not necessarly true in the case of the Sameri. It is a boxy little car,
with tons of drag, and a little engine. He said it was near wide open, and
that would not surprise me.

That said, Raven Redrives have a couple of Suzuki conversions.

It seems to have proven itself, fairly well, in airplanes.
--
Jim in NC