> Gentlemen,
 >
 > Iâ??ve been following these discussions regarding the slide throttle
and
 > wondered if anyone knows about the slide throttle that BMW made for the
 > M3â??s back in the late 80â??s early 90â??s in the DTM series in
Germany.
 >
 >
http://e30m3performance.com/tech_articles/engine-tech/dtm_slides/index.htm
 >
 > I canâ??t figure out from the pics how the mechanism works. It appears
 > that the sliding component is a metal (aluminum or SS) plate with some
 > Teflon coating?
 >
 > Also found another link to a discussion on slide throttle and barrel
 > throttles. Can someone elaborate on the barrel throttle and how it
 > operates.
 >
 > http://www.ten-tenths.com/forum/showthread.php?t=89467
 >
 >
 > Paul C
 >
 > Here are some 3D barrel throttles I have been fooling with.
 >
 > Paul Lamar ...No rotor no motor.
 >
 > Paul,
 > Here's an idea for your cylinder barrel throttle. If you made the end of
 > the cylinder the inlet, like a log manifold, you could do away with the
 > long slots in the barrel. You would only need the bores leading to the
 > intake tubes. I've attached a example. The part could be made simpler,
 > but I have shown coped inlet tubes and bell mouthed tubes. A Teflon
 > sleeve on each end, or 2 Teflon encapsulated o-rings could be the
 > bearing surface.
 > Bill Jepson
 >
 > You have a two tube P-port configuration shown.
 > Best used on a four side port engine as the plenum is out near
 > the end. You need the slide throttle in near the rotor housing
 > on a p-port to minimize the storage of exhaust contaminated
 > intake air.
 >
 > Here is a possible 3D application for the combined plenum and
 > barrel throttle.
 >
 > If you really want to make it easy operation you could use
 > the ball bearing trick on each end we used in the LAEV prop
 > rather than Teflon. Last dwg.
 >
 > Paul Lamar

Bill Jepson,
What about the tube slide throttle that Harley Davidson use? Is there any
advantage in this type of set-up?
I guess it's similar as yours and Paul's suggestion, would there be any
advantage in sliding it back and forth rather than around?
Back and forth could be sprung, then again having it go around could have
bearings as Paul suggested.
I guess your both saying the whole plenum would be your slide throttle?
tube
in tube would be simpler!
George (down under)

Yes George the entire plenum would be the rotating barrel for the
throttle. Not sure of what your refering to on the harley. The typical
motorcycle carb has used a round slide throttle. The reason was for
carberation reasons, which would require a LOOOOONG explaination here. I
havent seen anything beside the carb slide or butterfly throttle though
George. Have any pictures?
Bill Jepson

Bill,
The round slide throttle IS the one I was referring to!
I believe they have altitude compensation as well - can you comment on that?
George ( down under)

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