I can throw something into the mix here that AJ probably already knows and that is the crankcase on a Glow Engine runs much cooler than the cylinder area but on a model Diesel engine the crankcase runs at the same or nearly the same temp as the cylinder and head. I can only assume this is because the methanol does a much better job of removing heat as it evaporates in the crankcase. The volume of ether in the Diesel fuel is much less than the volume of methanol in glow so is not as effective at removing heat. That's my theory anyway.