Increased rpm = increased cfm?

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Forum topic by AKAndrew posted 12-20-2011 01:28 AM 968 views 0 times favorited 2 replies Add to Favorites Watch
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53 posts in 3286 days

12-20-2011 01:28 AM

If you spin the impeller faster by adding a pulley, does it increase the cfm?

2 replies so far

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51 posts in 2882 days

#1 posted 12-20-2011 02:00 AM

And if you get outside the intended CFM range the impeller will start to stall and you will actually decrease intake performance. This is a common problem in diesel trucks when you start modifying them. You get outside of the turbo’s designed pressure map and start to have turbo stall.

-- Mark - Pueblo, Colorado

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7 posts in 3182 days

#2 posted 12-20-2011 02:25 AM

From my Navy days
Pump (Fan) Laws:
Flow is proportional to Speed
Flow is proportional to Headloss squared(Friction or Drag… pressure drop)
Flow is proportional to Power cubed
So if you double the flow you use 8 times more power.

-- Chris, Canterbury, CT

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