Hey Paul,
Ask a guy who currently has 2 cylinders in the back seat of his Chevy Tahoe
about low compressions #1 and #2 on our left engine were under 20 lbs
when we checked them this weekend after being in the mid 70's last year.
JPI data didn't show anything significant during cruise, but we see some
excessive EGT drop with major power reductions on the #1. Valves move well
and look good, but there's plenty of buildup. So we'll send them in to have
everything cleaned up, the seats ground, valves lapped, guide reamed, and
what ever else they recommend. These are Lycoming nitride, what cylinders
are on the club Lance?

dieing on rollout. I've had this occur twice with the Aztec, it makes a
twin fun to taxi. Both times it was the right engine after normal approach
and landing on a very hot (+90) day. I asked a couple A&P's about it and
they both said that if the rpms at idle are normal when the engine is warm,
then suspect fuel pressure.

No answers, just general questions.
Do you normally turn the electric fuel pump on for maneuvers and leave it on
for touch and goes? Can you discern any relationship between the electric
fuel pump operation and the engine dieing, such as it dieing shortly after
the pump is switched off while at low rpm? When was the last time the fuel
pressure was checked on the electric pump? Any sign of fuel leaking from
the mechanical pump's vent/drain? Could your mechanical fuel pump be weak?

I've got a Lance manual in this PC somewhere. If you need any specs let me
know. When I have a minute, I'll look at the troubleshooting sections.

Jim

"Paul Tomblin" wrote in message
...
Our club's PA32R-300 has an IO-540 with lots and lots of hours on it.
After 20+ years, at this year's annual the compression was down a few
pounds on a couple of the cylinders, and the mechanic said he really has
his doubts about it passing next year's annual. That might be
significant, or it might not.

Twice this year, while people have been flight training in it (I was doing
a BFR this spring, another pilot was checking out in the plane for the
first time a few weeks ago), the engine has been running fine and on
rollout afterwards the engine died and couldn't be restarting. Both times
it was after doing some air-work (stalls, steep turns, etc) and then a
couple of touch and goes. Nobody has had any problems in a normal point
to point flight, although we've had the normal problems with hot starting
that's endemic to fuel injected aviation engines.

The last time it happened, the engine died at the airport where our
mechanic is based, and he pulled the plugs and said they weren't fouled
and they were dry (so the problem restarting wasn't that he flooded it).
Based on a suggestion here, I had them check the fuel pressure, and it
seems fine. Could it be vapour lock? Any other suggestions?

--
Paul Tomblin http://blog.xcski.com/
"Once you have an emergency, the airplane belongs to the insurance
company.
Concentrate on saving people on the ground, your passengers, and yourself,
in that order. Saving the plane is not on the list."