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Old 02-01-2012, 09:19 AM
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subzali subzali is offline
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Location: Denver CO
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Originally Posted by DaveInDenver View Post
Asks the E.I. studying for his test... :-)

Okay, so quick napkin calc:

SD-510 has approx. 10 cu. in. displacement.

I had my engine idling at about 800 rpm. Assuming the compressor pulley is approximately the same diameter as the crank pulley:

At 800 rpm, compressor output = 4.6 cfm with no backpressure

If the discharge connection is 3/4", then that is approx. 21 ft/s discharge velocity. Yeah, I guess that's about what I felt.


At 2000 rpm, compressor output should be about 11.6 cfm with no backpressure, so looks like I need to figure out a hand throttle
Matt Miller
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