Quote:
Originally Posted by oil pan 4
It would appear the MAN diesel and Cummins are saying close to the same thing.
Man diesel was claiming air temps lower than 30'F to 40'F hurt fuel milage and cummins recomends staying above 20'F.
I knew cool air was good to a point, but never new what those numbers could be till now.
Cool air above 40'F and intake harmonics are the way to go.
Cold air intakes are good more often than not, just have to keep the air going into the enigne after the intercooler above 40'F.
I have a -40'C to +40'C temperature probe on order to put down in the intake manifold to get some real numbers.
I have the problem of 0'F temperatures in winter here.
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My fuel economy on my diesel goes to crap in the cold, but I have no edea how much of it is idle time & warmup and hom much is the lower energy content of diesel and how much is intake temperature. I do have some -30C highway runs recorded but wind direction is a vairable as well. I do know that it is significant for me though.