Yes there is, Dave. You cannot compress air without heating it somewhat. The rise can be mild to extreme, depending on your compressor efficiencies. Also adding to the air temp is the fact that you are pumping it through a hot crankcase (in the YS engines).

I don't see why you couldn't supercharge a model diesel engine, but I have no firsthand diesel experience to base that on, just general engine knowledge. The intake air temperature would be consistent once the engine was warmed up, so you could probably account for it in your timing setting, though.


Mark