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
<http://www.ten-tenths.com/forum/showthread.php?t=89467>


Paul C

Please right click on the pictures and "save as" jpgs.
Send the jpgs as it is too hard sometimes to find the
things you are talking about.
-- Paul Lamar ...No rotor no motor.

Paul C,
The barrel throttle could be thought of as a butterfly throttle  turned
inside out. There is a solid cylinder that has the intake shape bored
through it. The body of the throttle has a cylindrical bore through it
like the shaft of a butterfly but huge to contain the barrel. This type
of throttle is normally only used for racing since the two opposite
edges cause higher pumping losses at all but wide open throttle. For
racing though you are not worried about minor losses, (poorer mileage),
at mid throttle openings. If the engine runs tractably in mid-range and
screams at WOT then your good to go. It would work on an aircraft, but
would be harder to manufacture than the slide throttle, especially as
Paul has configured it currently.
Bill Jepson



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