Increase /Decrease keys for radiator - Request for 4.11.1 or 4.12

[Luno13]

It may be worth mentioning that sudden reductions in power could cause shock-cooling, and cracks in the cylinders.

Also, one could destroy his engine in a heartbeat if RPMs were set too low while manifold was too high. For this reason some planes had a stopper to prevent the throttle from moving past the RPM lever.