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Subject: RE: [LML] Teardown and check TSIO550?
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Bob,

There are only 375 hrs on the engine during which time I had not a spec of =
problem except for one cracked cylinder seat (Performance replaced the cyli=
nder at NC). =20

I take off with the aux pump on, and I have tested the aux and know it is w=
orking.  Not surging, but power seems reduced. =20

Prof. Klaus has offer a couple suggestions and I will have him check the EI=
 before I do anything truly expensive.  Thanks for the note about "idle" fo=
r restart.  Changing shorts in flight is a hassle. =20

Robert
ES-P N301ES

-----Original Message-----
From: Robert R Pastusek [mailto:rpastusek@htii.com]=20
Sent: Monday, September 9, 2013 1:04 PM
To: Lancair Mailing List
Subject: RE: [LML] Teardown and check TSIO550?

Robert,

You did not say how much time you had on your engine, but if it's not yet t=
o recommended overhaul--which you imply by suggesting an inspection rather =
than an overhaul, AND the temps/oil pressure are normal,  I'd look for the =
cause of roughness. =20

The first suspect for me would be the magnetos, and after that, the rest of=
 the ignition system. Then the fuel system. Problems with either will cause=
 variations in the CHT/EGT/TITs, but they might be subtle. The ignition sys=
tem is more highly loaded/stressed during high power climbs; if the mags, s=
park plugs or wiring are breaking down under this load, any of these compon=
ents will cause the engine to run rough, and it should be a "steady" roughn=
ess. An in-flight mag check during roughness will isolate this quickly, but=
 be careful. If the engine quits during this check, you need to pull the th=
rottle to idle before turning the mags back to both. Not doing so will caus=
e a very loud bang, and could damage the engine/turbos/exhaust system.

If the engine "surges" rather than exhibits steady roughness, suspect the f=
uel system. Turning the boost pump on low, if it's not already on, should h=
elp isolate a fuel issue. If it is on, try high boost...but you may need to=
 lean the mixture to keep the engine running.

I don't want to discourage you from finding/correcting the problem...and fe=
rrying it around to different shops with a known problem is just not smart!=
 There are things that warrant teardown and inspect/overhaul. What you desc=
ribe, given that I am not there/don't have specifics, suggests some good lo=
cal troubleshooting before tearing the engine apart however...

My two cents.

Bob


My engine started to run rough on climb out, cleared up, and ran rough agai=
n. =20
All the inflight temps and flows were completely in line with previous flig=
hts.
Ran a new conditional and found nothing amiss.  Compressions good, plugs cl=
ean, oil filter had no metallic. =20
Ferried it to Kelly Aerospace for work on the A/C and de-ice (mice in the w=
ing!) and the 45 minute flight was uneventful.
However when Kelly flight tested the plane it seemed sluggish and it ran ro=
ugh again.

Thinking about a tear down and inspection but not expecting a complete rebu=
ild. =20
Anyone recommended who could be within 1 hr or so of central Ohio?