Quote:
Originally Posted by abently
That's correct.
Re-read what the Old Mechanic said;
Same power with less fuel.... lol
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No, it didn't help that he phrased his statement the way he did.
He mentioned stuffing more air into the cylinder with less percentage of fuel. Holding the amount of fuel steady while stuffing more air into the cylinder would result in the same amount of fuel being burnt as before, thus getting the same energy out of a power cycle as before.
Along with that, if you get more air into the cylinder, then that means a lower engine vacuum, which implies a more open throttle. Thus, both throttling and pumping losses are reduced. As a result, a larger percentage than before of that work being developed, as described in the paragraph above, can be used to actually do something useful, and it will cause the vehicle in question to accelerate unless the fuel flow rate was reduced. It then becomes necessary to reduce the fuel flow rate a little bit to maintain the same vehicle speed as before.
Therefore, with lean burn you get the same power with less fuel.