Increased rpm = increased cfm?

  • Advertise with us

« back to Power Tools, Hardware and Accessories forum

Forum topic by AKAndrew posted 12-20-2011 01:28 AM 758 views 0 times favorited 2 replies Add to Favorites Watch
View AKAndrew's profile


53 posts in 2196 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

View Brickman's profile


51 posts in 1791 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

View Maniteee's profile


7 posts in 2091 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

Have your say...

You must be signed in to reply.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics