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Posted for Don Skeele <dpske@wvi.com>:
Re: Ram Air- K&N Filter--Design by "Van"
Concur with all your post, had same data from "Vans" a few years ago, the only difference , I made mine out of Aluminum, with a carb heat, alternate air additions.. The factory and Vans carb boxes were not made fireproof- therefore a big induction fire was a real problem.. Maybe they've changed ..??
I clean the K&N Filter each year--quite a bit of dirt and I operate only off paved surfaces.. So I don't concur with the post to use unfiltered ram air, it doesn't give you more MP.. Don Skeele 235/320 N320J with 650 hrs..
Bypassing the filter at altitude may be a
reasonable thing to do,
Or maybe not. "Van" claims they ran a RV6 with and without a K&N Filter to
determine the difference. They use a straight in plenum (aprox. 3" opening
gradually expanding to about 7" wide) which required the induction air to
turn 90 degrees about 14" behind the inlet to enter the updraft carburetor.
The result was a significant increase in MP at all cruise and climb
airspeeds, confirming the K&N claims.
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