Backward Running Engine

mbremer216 wrote:
: Cherokee w/Lycoming 0360-A4A

: Normal flight in all respects. When shutting down, pulled throttle to idle
: and mix to idle cut-off. Engine took just a little longer than normal to
: run down. Just as it should have stopped, it caught and actually ran
: backward for a couple of turns before stopping.

: Any ideas as to why?

Completely WAG, but extra-rich idle mixture pooling in exhaust system, gets
sucked in on the final "bounce" and either preignites from hot heads and/or mags
firing at normal 25 "BTDC" (now ATDC).

Like I said, completely WAG.... getting fuel into the thing running backwards
is the tough part to explain.

-Cory

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* Cory Papenfuss *
* Electrical Engineering candidate Ph.D. graduate student *
* Virginia Polytechnic Institute and State University *
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