|
A diesel is an engine that gets more efficient with the more excess air it ingests. That is why they do not put throttles on them. Outside of decreasing warm up time, a warm air intake on a diesel does absolutely no good .
The more air ingested into the cylinder the higher the percentage of fuel energy that goes to heat it instead of the cylinder walls. Not only that but excess air also increases the specific heat ratio of the combustion gasses that further increase efficiency. Further more it promotes more complete combustion.
An intercooler improves the efficiency of a diesel by several mechanisms. It reduces the heat lost to the cooling system. It reduces the work needed to drive the turbo. Lastly it increases the specific heat ratio of the combustion gasses.
An intercooler that is prevented from doing its job is just dead weight and a restriction in the intake path.
__________________
|