RAM air intake mesh pitch - Suzuki GSX-R Motorcycle Forums Gixxer.com

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post #1 of 5 (permalink) Old 04-15-2019, 08:21 AM Thread Starter
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RAM air intake mesh pitch

A car guy at work commented on my made up air intake grill that it might restrict air flow too much.

On an old Sport Rider test with a ZX9R, they tested 131 BHP with RAM air vs. 123 without.

But I'm wondering if the grill size will make much if any difference at the top speeds typical for a GSXR.

I'm pretty certain it won't make that much difference, but interested in any opinions.



VS.





Last edited by Afro; 04-15-2019 at 08:23 AM.
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post #2 of 5 (permalink) Old 04-15-2019, 08:29 AM Thread Starter
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Re: RAM air intake mesh pitch

Btw the aperture size difference is approx 3.5mm
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post #3 of 5 (permalink) Old 04-15-2019, 10:10 AM
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Re: RAM air intake mesh pitch

I highly doubt it makes any difference and id be hard pressed to think if it made a difference it would be noticeable. Id get a couple more opinions though.
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post #4 of 5 (permalink) Old 04-15-2019, 10:24 AM
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Re: RAM air intake mesh pitch

Probably does have a negative impact, but I highly doubt anyone short of a fully tooled race team could measure it. If you're worried about it, put an absolute pressure gauge on the dirty side of the airbox and see if it reads higher or lower than ambient.
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post #5 of 5 (permalink) Old 04-15-2019, 04:54 PM
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Re: RAM air intake mesh pitch

Calculate the percent open area from the wire size and mesh spacing. It should give you an idea of how much blockage is there. With that and an estimated intake opening size, you could compare that with the opening through the screen on the air cleaner. There ought to be figures that provide the pressure drop through mesh screens for a given flow rate. But in a quick search, I couldn't find one.

P.S. The perforated screen over the K5/K8 air filter has a 51% open area. But it's across a 278 cm² area. I calculated that the pressure drop across it at red line is around .1 inch of water (.0036 psi), which is small enough to ignore. Your woven screen looks like it's around 50% open. But I'm fairly sure that the area of both inlets is much smaller.

Also see this. Comparing pics of OEM screens with info from expanded metal suppliers suggests that the OEM screens are 80%-85% open (should be straightforward to calculate).

Last edited by BillV; 04-16-2019 at 12:51 PM. Reason: Added P.S.
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