air flow #s ?

Kevin Panzino · 07-12-2013, 07:39 PM

Yes, Take the square root of the pressure difference (28"/22") and multiply that with the flow number.

Example:

You have a set of heads that flows 215 CFM at 22". They would flow 242.6 CFM at 28"

And by the way, I contend the 'standard' is still 25"...
28" only came to be because of unscrupulous head companies that were looking to be able to advertise more CFM than their competitors, with the idea that most folks wouldnt understand the difference between 28" and 25".....

And testing at 28" offers no advantage at all over 25" , or even as low as 10" for that matter (the average cyl, head port easily has fully developed flow even at 10" H2O.....)

Kp

07-12-2013, 07:39 PM	#2
Kevin Panzino Senior Member Join Date: Oct 2002 Location: Pittsburgh Posts: 575 Likes: 298 Liked 747 Times in 136 Posts	Re: air flow #s ? Yes, Take the square root of the pressure difference (28"/22") and multiply that with the flow number. Example: You have a set of heads that flows 215 CFM at 22". They would flow 242.6 CFM at 28" And by the way, I contend the 'standard' is still 25"... 28" only came to be because of unscrupulous head companies that were looking to be able to advertise more CFM than their competitors, with the idea that most folks wouldnt understand the difference between 28" and 25"..... And testing at 28" offers no advantage at all over 25" , or even as low as 10" for that matter (the average cyl, head port easily has fully developed flow even at 10" H2O.....) Kp