eznfrank
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| posted on 13/5/09 at 09:50 AM |
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Guide to calculating max BHP rating and flow rate of K&N filter
I've been busy with the cardboard and sticky tape in the garage mocking up an airbox for the Indy, trying to take into account the seemingly
endless number of factors mentioned in previous threads.
Anyway, I'm happy with my design and whilst researching air filters I spoke to a decent bloke at K&N who told me how they calculate the max
BHP rating and air flow capabilities of their filters.
On their site you can search by dimensions which is handy too.
Anyway, Length (mm) x Width (mm) x 0.005 = Max BHP rating. he said they add on 80% if it's for a turbo motor.
Air flow is BHP x 1.6 to give a measurement in cubic feet per minute.
[Edited on 13/5/09 by eznfrank]
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BenB
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| posted on 13/5/09 at 10:16 AM |
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Handy info! I guess it's all about cc/min requirements and the engine BSFC.
In one of my geekier moments I got Graham A.Bells book "forced induction performance tuning" (or whatever it's called) and worked
out equations for throttle body diameter vs BHP for NA / blown / turbo installations. Each actually has quite a simple equation. Of course I totally
ignored the recommended throttle body and went for one twice the size 
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