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 Dip in exhaust flow curve 
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Joined: Wed Mar 03, 2010 11:31 am
Posts: 29
Location: Suffolk, England
Hi All,

I have been noticing a trend during exhaust flow testing that I don't know if anyone else has had experience with. With the heads I test (normally four cylinder engines 1.3L-2L in size) when I do a range change about midlift I get a dip in the flow curve. This is a recent example below;

Lift (mm)/ Orifice dia (in)/ Percentage %/ Raw CFM
4mm/ 1.26"/ 73.5%/ 43.3
5mm/ 1.26"/ 88.75%/ 52.3
6mm/ 1.494"/ 53%/ 43.9
7mm/ 1.494"/ 61%/ 50.5
8mm/ 1.494"/ 68.5%/ 56.7

The attached picture shows the range of the plates used in the test. I'm not sure what is going on. Any ideas?

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Wed Dec 06, 2017 9:14 pm
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