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Originally Posted by Christ
I'd agree with you, if we were talking about an engine that was designed for anything more than bench testing theories.
Regardless of what you think of the results, engineers and engine builders alike both know that hotter intake air will decrease efficiency of diesel engines.
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My apologies -- I had in my mind that your control of injection timing was not that accurate from this initial statement (
my emphasis):
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Originally Posted by question
Were you holding the fuel injection timing as a constant parameter?
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Originally Posted by answer
Engine speed was constant, and the engine was just a bench motor, so I'm going to have to say yes, we were. The engine wasn't designed to rev up and down, it was designed to hold a constant speed for test purposes.
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Your answer then changed to:
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Contrary - due to lack of control, the fuel timing was set non-optimal from the beginning, so that at it's normal operating speed, it was being injected at TDC or as close to it as possible, to prevent this very occurrence.
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In a review this would be a bit suspect, i.e. you're appearing to alter the controlled conditions of the experiment to fit your data: a certain hypothesis. I know you mentioned you did the experiment some years back. Rigorously, I think my answer also fits the data you initially presented. It is a confound you have not removed.
You also just revealed that you did not test whether heated fuel and/or a heated cylinder would affect the results of heated air being used. Nor did you investigate what would happen to efficiency if heated fuel, a heated cylinder and an over driven supercharger was used that compressed the same number of mols of heated air into the cylinder as would be found in room temperature air.