Posted by jdemaris on July 27, 2010 at 13:50:36 from (67.142.130.14):
In Reply to: Diesel Air Volume ? posted by M-MAN on July 26, 2010 at 22:39:57:
At max flow, there is no difference between the gas engine and the diesel. If there is no turbo, and the bore and stroke match, and the RPMs are the same, so is the air draw. It's based on engine speed and volumetric-efficiency. Most older NA diesels and gas engines are 60% efficient. So, calculate your bore and stroke along with RPMs to figure how much physical volume is moved -and then take 60% of that and it is your air-flow.
As already mentioned, most diesels run wide open air intakes (but not ALL). I have several IH diesels with air-throttle plates. This does not mean, however, that they take in much more air then gassers. This only happens at certain RPMs and throttle positions for a gas engine. If a gas engine is running low RPMs with a closed throttle - the air draw is close to a that of a diesel. If a gas engine is running high RPMs with a closed throttle (thus creating engine vacuum) then it does take in substantially less air then the diesel would.
Seems in your case, all you need to know is the most flow needed so the air cleaner won't restrict flow. That will be basically the same.
I recently went though all this when I was trying to find an air-cleaner assembly to fit my 6.2 diesel motorhome after I installed a Banks turbo. I got reading many air-flow specs for factory installed air filters. Gas or diesel made no difference. Horsepower and max RPMs did.
The air filter for a GM 2.8 will flow more air than the OEM Ford tractor filter ever did. That because the 2.8 can run much higher RPMs.
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