Posted by jimg.allentown on December 29, 2017 at 05:18:19 from (173.49.133.204):
In Reply to: OT duramax posted by schrade on December 28, 2017 at 18:57:56:
Diesels operate on a different principle than gassers in regards to air and fuel. Gassers operate on a surplus of fuel and air is throttled. Diesels operate on a shortage of fuel and surplus of air so fuel is throttled. This means that the engine is operating mostly as an air pump with unrestricted air flowing through it. this tends to cool the engine at low RPM and no load conditions. Diesels tend not to warm up until you put them to work. Also, since a diesel will generate a lot of heat when under load, it will have a lot of cooling capacity in the cooling system. Another thing is that diesels are built heavier to withstand the higher stresses that their necessary high compression and high torque demand. This makes for a lot more mass than a gasser. Add all of this together, and it explains why a diesel will not warm up quickly (if at all) while idling.
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