wrote in message
...
Hey all. As some of you may recall, about a year ago I posted a question
regarding two different power loss issues I was having
with my PA-28-140 with an O-360-A4A 180hp upgraded engine. I'll summarize
what's transpired and figure to get some opinions on what I
might try next.

Basically, I had an intermittent slightly low power on about 1 in 25
takeoffs. Not enough to make you abort, but enough to realize
upon climbout that it wasn't quite doing what it usually did in terms fo
FPM. Never rough, did mag checks, fuel pressure good, EGT
correct, CHT correct, etc, etc... just a little low on power, and after a
minute or so it would quietly come back. After checking cam
lift and lifters, etc, I realized that the dry tappet clearance was too
much on about 5 of the 8 pushrods. I fixed that, and the problem
has not come back after a year.

snip

Some of the things that might be helpful to specify are the conditions you
are experiencing this condition. For instance, you mentioned your airport
is 2100 MSL, but what was the density altitude? What FPM are you getting?
Are you leaning at all prior to takeoff or during the climb?

You mentioned EGTs on all cylinders, so I'm assuming you have a full engine
analyzer. Most of these have a download function. What I suggest you do is
take a normal flight and carefully note all the conditions of your flight,
then do a download of the data. You might try shooting an email to Walter
Atkinson over at advancedpilot.com. Walter participates in a number of
forums and he's quite helpful.