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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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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