Hey Dawgie,
Lots of engineering required. Auto engines HATE running for long times at constant RPM. The lube system relies on RPM changes to lube the cylinders for a start.
That's why Subaru boxers aren't converted to fly much. An outstanding engine but need RPM change to survive. I've been running highly tuned Subis for many years and this is well known. An hour on the freeway with no traffic can be risky when you're pulling 200Kw at the wheels. Constant RPM is a no-no. Maybe keeping the speed limit would help??
