Ignition leads

Those compression numbers sound like our Lyc 0320 E2D powered 172M.
It never has had particularily good compression since it was new 25
years ago. If we get one that won't make 60/80, we check it again 5
or 10 hours later and it always is up again. It has been doing this
to us for 20 years.

I've always felt that a moderately (say 50/80)low compression number
without any other obvious cylinder trauma isn't automatically a reason
to pull a jug, at least not without a later recheck. If there are
other signs like high oil consumption, plug fouling, or rough running
etc then I could see pulling it.

wrote:
: I've always felt that a moderately (say 50/80)low compression number
: without any other obvious cylinder trauma isn't automatically a reason
: to pull a jug, at least not without a later recheck.

If the compression is that low (basically, anything under 70/80), there's a
definitive REASON for it... leaking valves or leaking rings. Neither one is a good
thing, but the valves in particular are a very bad thing. Rings may be gunked up or
never seated, but there's something wrong if compression is that low.

-Cory

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