Strokers run warmer???

67Dart273 said

Horse manure. If you took an all iron engine, what you are saying is the iron WOULD NOT BE ABLE to transfer heat into the coolant. What this implies is that the IRON engine would run hotter, because it would not be able to reject the heat.

What are you going to claim next, that the iron radiates it's heat into the air?

If the aluminum rejects more heat into the coolant, all this means is that the engine is going to run COOLER because it is getting rid of more heat that "was" in the engine. If it actually runs hotter, this is because the cooling system is too small.

Aluminum does not produce heat. What goes on in the combustion chambers does.

I'm no expert on theoretical thermodynamics, but I did spend not quite 15 years in the HVAC / R repair / maintenance field.

Click to expand...

Let's see if I can word it better...
It's about cause and affect. Assuming the same head design and engine parameters - the heat in the chamber is the same between the two materials. The material of the head/chamber is a huge influence on the rate of conduction of heat from the chamber into the coolant. Iron is less of a conductor than aluminum. So while the heat in the chamber is the same the amount of heat the cooling system get's into it is greater for an aluminum head engine vs iron. This is assuming there are no coatings to further reduce the rate of conduction from the chamber. How that manifests itself is the radiator has to transfer more heat from the collant to the air. The cooling system has to deal with more of a load... i.e. it "runs hotter". Sorry if that was understood as me re-writing physics.
With all your years experience you don't fully grasp how materials affect operating temperatures and performance? Try replacing an aluminum condensor coil with an iron one and tell me how well they perform the same job.