Hood Proping?

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06-25-07, 12:32 PM

#26

toplessFC3Sman

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any air pressure gauge will do it, as long at its not having air forced into it (due to vehicle speed, radiator fan etc). So by putting a baffle on the end of an ordinary pressure gauge, you could measure static pressure

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06-26-07, 05:25 AM

#27

NZConvertible

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Quote:

Originally Posted by toplessFC3Sman

if you jack up the rear of the hood on a TII with a top-mount, wouldnt it be very counterproductive by un-sealing the hood vent with the top of the intercooler, no longer forcing air thru?

Very true. A lot of the air would take the easier path around the core rather than through it, reducing its efficiency and effectiveness.

Quote:

Originally Posted by MmSadda

NZ Convertible, how does one measure static pressure?

By running a hose from a pressure gauge out to your location to be measured, and sticking the hose to the hood with the open end of the hose at right angles to the airflow (i.e. pointing to the left or right). If you placed it pointing straight ahead you'd measure dynamic pressure.

Quote:

Originally Posted by toplessFC3Sman

any air pressure gauge will do it...

Not true at all. The pressures involved are very small, so you need a gauge that can read very low pressures, both positive and negative. Magnehelic gauges are designed specifically for this, and one than measures from -1 to +1inH2O (0.036psi!) is ideal for this application. These are easy to get from Ebay, but FC owners don't tend to get enthusiastic about this sort of testing.