Quote:
Originally Posted by Andyman
I found a couple of mistakes.
1) Advancing ignition timing: If you increase power without increasing fuel flow, you will decrease the BSFC, not increase it. The goal is to minimize the BSFC, which is a measure of the amount of fuel used to do a certain amount of work.
2) Hot / warm air intake: I think that a higher air intake temperature will increase the heat transfer through the cylinder walls because of the increased temperature difference between the air and the cylinder during the power stroke. Also, hot intake air doesn't change ignition timing unless the engine starts to knock (or ping) and the engine is equipped with a knock sensor. If the engine is not equipped with a knock sensor then somebody may need to retard the timing to eliminate knocking. You may want to mention that power will probably go down with hot air intake because of reduced air density.
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On newer vehicles there is what is called an IAT sensor. It measures incoming air temperature and helps the computer adjust the ignition timing. Hotter air>retarded timing>better fuel economy.