# discussion time

**URL:** <https://forums.speedlife.net/t/discussion-time/19352>\
**Category:** NYSpeed Automotive\
**Created:** [October 27, 2006, 1:54am UTC](https://forums.speedlife.net/t/discussion-time/19352 "2006-10-27T01:54:13Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![Fry](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/fry/32/7284_2.png) [@Fry](https://forums.speedlife.net/u/Fry)\
**Post date:** [October 27, 2006, 6:46am UTC](https://forums.speedlife.net/t/discussion-time/19352/3 "2006-10-27T06:46:44Z")

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OK lets do some rough calculations:

-lets say it’s a 2.5L motor spinning at a redline of 6500 RPM.  
-It’s a 4 stroke so it passes those 2.5L 3250 times per minute  
-That works out to 8125 Liters/Min  
-But wait, they’re claiming 6 psi! So lets apply the ideal gas law to our air/fuel mixture  
-8125_20.7=X_14.7  
-X = 11,441 Standard Liters Per Minute of airflow, or 404 SCFM (404, isn’t that ironic? 404 gains not found.)

For comparison’s sake, a Toro Ultra Blower Vac 51598 leaf blower flows 385 CFM and requires 12A x 120V = 1440W. (Keep in mind this is an open-flow rating, at 6 PSI the power draw would be MUCH higher.)

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-So we’ll linearly extrapolate to 404 SCFM. 385/404 = 1440/X  
-X = 1511 Watts  
1511W/14.4V = 104 amps

That’s with the blower at open flow. With pressure built up to 6 psi, you’re probably looking at double or triple the power draw. Think your alternator can push 300 Amps?

Roughly.

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