Tractorsport Flowbench Forum Archive

Posted: **Thu Sep 22, 2005 8:55 pm**

How do I go about calculating the required airflow,
if I know cylinder displacememt and rpm range ?

Putting big ports on a small motor won't get the effect I want.

I'm sure I had a link to a airflow calculator,but can't find it now.

Thanks.

Ian

Posted: **Fri Sep 23, 2005 12:03 am**

Ian,

Here's an online calculator
[URL=http://www.wallaceracing.com/flow-rpm.php[/URL]

Posted: **Fri Sep 23, 2005 12:11 am**

Here's a couple from Superflow that should come in handy.

RPM= [2000/CID] X CFM@10"
For a full out racing engine use 2200 instead of 2000.

HP=.43 X CFM@10"

Safe Peak RPM = 22,000 / in. stroke
Max Peak Power RPM = 27600 / in. stroke

The last two use 3700 ft.\min piston speed as the safe limit.

Larry

Tractorsport Flowbench Forum Archive

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