I didn't know that ram air speed was as important as slowing the air down and having pressure pushing the air into the carburetor. The difference between my manifold pressure when the carb heat is pulled and when it is not is about .75" at 160 KIAS. I believe that .75" is about all of the ram air pressure increase that you could expect at 160 KIAS.
At the 2004 Redmond Labor Day race, I had the fastest 320. Pictures of its' RV4 filter follows:
I am putting Grove wheels on and doing my condition inspection as we speak. My BC-100 battery still looks good. I will not change it this year.
Lorn
Gents, perhaps you contact their engineering staff and get Van's A/C data to support the "equivalent" MP. data with and without the K&N Filter. My conversation was with their chief engineer at the time over coffee and a knapkin drawing. The entire design was run thru an A & I with over 25 years of engine experience, and suffice that this aircraft won it's heat at the Redmond Labor Day races 4 years running (235 Modified).. Don Skeele N320J
Date: 2005/06/20 Mon PM 09:29:38 EDT Subject: [LML] Re: Induction air filter
In a message dated 6/20/2005 3:08:31 P.M. Central Standard Time,
With that filter configuration - I don't see how any MP gain is possible.
Matt,
I agree. But, I would love to measure MP, pre-induction air speed, pressure, etc. Maybe there is a sophisticated explanation. I am already devising experiments. Remember, certain race car induction systems were improved by merely imparting a spin to the incoming air (wish I could remember the reference).
Scott
-- Lorn H. 'Feathers' Olsen, MAA, DynaComm, Corp. 248-345-0500, mailto:lorn@dynacomm.ws LNC2, O-320-D1F, 1,100 hrs, N31161, Y47, SE Michigan
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