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 Sf110 int-ex flow difference 
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Joined: Tue Sep 13, 2016 1:12 am
Posts: 2
Hi all im a newbie woodduck lookin to pick the collective brains for an answer. I have a 110 yea sorry.....ok i have upgraded the motors and it has a pt black box with temp sensors.so when i flow the test plate ie 5/16 & 1 7/8 hole on int mode with correction factor i got 152.9 cfm @10" flip the test plate over flow in ex mode 165.4 cfm @ 10". Is this an inherent problem with this style of bench? I feel that it is a bit of a difference but am i just being too pedantic? Any input would be appreciated.
Thanks scotty.


Fri Feb 24, 2017 4:31 am
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Joined: Tue Sep 13, 2016 1:12 am
Posts: 2
Sorry ....forgot to mention leakage on tests was under 1 cfm on both sides so not a bench leakage problem.


Fri Feb 24, 2017 4:58 am
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Joined: Fri Jan 08, 2010 3:35 pm
Posts: 1664
Location: Pennsylvania
Welcome to the Forum!

Seeing a difference in CFM between intake/exhaust is typical due to how the measuring orifice is "seeing" the airflow. The path the air is taking is not the same in intake/exhaust. That style flowbench is heating the air either after or before your test piece so temp has to be accounted for in the math to derive CFM

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Who . . . me? I stayed at a Holiday in Express . . .


Fri Feb 24, 2017 7:24 am
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