Posted by Indiana Ken on October 04, 2014 at 18:19:57 from (66.249.228.8):
In Reply to: Homemade Super Charger posted by 60 acre hillside on October 04, 2014 at 05:57:12:
Quoting Removed, click Modern View to see
The air flow through an engine can be estimated by the following:
CFM = ((Displ x RPM) / (k x 1728)) x Efficiency
Where:
CFM = Cubic Feet per Minute (intake air flow)
Displ = Engine displacement in cubic inches
K = 1 for two stroke engines and 2 for four stroke engines
Efficiency = A measure of how well the engine fills the cylinder on each intake stroke, in percent. A very high performance engine may be 80 - 100 percent. A tractor may be more like 50 percent. This is pretty much a guess unless you have data or data on similar engines.
Most engines should be able to handle 3 to 4 Psi of boost without problems however, this is not a guarantee. I would not expect a vacuum to output any where near this pressure level but, I have not seen your vacuum cleaner.
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