2021 Ram 3500 H.O.

4x4ord wrote:
Your claim that v engines require more cooling capacity than inline engines is confusing me. I might believe that heat management in a V engine is more involved. I can see why a v engine might tend to run a little hotter (which could mean less demand on the cooling system). What exactly do you mean saying a V engine require more cooling. Are you simply meaning that the greater surface area of an inline engine can radiate a little more heat directly into the engine compartment vs a more compact v engine?

It's actually not a claim. It is the truth according the PB/KW/PACCAR engineers and is one of the reasons why engines CAT 3408 or Detroit 8V92 is no longer around in the class 7-8 trucks anymore. The cooling system requirements were greater than the comparable inline 6 engines and added more weight which is a hot commodity on a commercial truck. The other main reason was that it was a fuel hog. As far as the exact or scientific reasons why V engines tend to run hotter, I have am not 100% sure.


I would still check that cap and the system for boost leaks.