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I have been working with motorcycles/racing/tuning most of my life, and as you all know motorcycle engines are small displacement engines that produce a lot power. Visit your nearest dealer and he will introduce you to a 600cc(0,6 litres) motorcycle producing near 115 HP(normal aspirated, carburetted stock engine that is). These engines revs up to 14.000 rpm. The last ten years the development on air induction have been enormous on motorcycles.
I've seen Lancairs and other high performance aircrafts with only a 2 1/2 inch pipe all the way from the cowling-intake to the throttlebody with a "T" on it for filtered air! Try running as fast as you can a couple of miles breathing trough a 12 inch long and 1/2 inch thick garden hose. You'll feel like these guy's Lycomings probably do -Restricted!
My advise to fellow builders:
1. Make a airbox as big as possible(volume is more important than form).Be sure to seal it 100%. I am planning to use the bottom engine cowl as a part of the box.
2. Use a LARGE area, high flow airfilter (K & N) and please do not mount it directly on the throttle body.
I would prefer a flat type (still K & N)filter made for a car with at least the same displacement as your
engine. I would also leave about 1/4 to 1/3 of the airbox volume behind the filter. And as Tom Giddings wrote; Put in a springloaded alternate air door just for piece of mind.
3.(Optional but recommended) Make a adjustable (telescopic)" velocity stack" with the same bore as your throttlebody.(If you make it "in flight" adjustable one testflight is enough to give you a perfect tune).
4. Keep in mind when building BIG airbox: Make airfilter easy to inspect and service, if not it would be like the Suzuki motorcycles: TDBSE (Total Dismantle Before Servicing Engine)
Regards,
Roy Valvik
Norway
360 FB 25%(I hope.)
For brake fluid reservoir, use a rear brake reservoir from a Kawasaki or Honda motorcycle. These are made of transparent plastic,breathable screw on lid with a diaphragm and can go inverted without leaking. And the best part ; They are almost weightless and cost nothing(almost).
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LML homepage: http://www.olsusa.com/Users/Mkaye/maillist.html
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