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Date: Thu, 21 Jun 2012 13:07:35 -0400
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From: Lorn H Olsen <lorn@dynacomm.us>
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Subject: Re: New TSIO 550-X break in - need suggestions
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Bob,

It sounds like you have either 1 of 2 problems.

   1) Your engine is running hot because you are breaking it in.

or 2) Your timing is to far advanced. Advanced timing causes CHT's to be =
hot and EGT's to run cool. Retarded timing causes CHT's to be cool and =
EGT's to be hot.

I found this out from experience in my newly installed O-320. CHT's were =
up to 460=B0F in the climb. I found that the left mag had been set to =
50=B0 BTDC rather than the 25=B0 BTDC that it should have been set at.

If the engine doesn't run cooler after break in, check the mag timing. =
Check it anyway.

Lorn

> From: Bob Rickard <r.rickard@rcginc-us.com>
> Date: June 20, 2012 7:15:53 PM EDT
>=20
> IV-P non turbine Fellow Pilots:
>=20
> I recently received a rebuilt TSIO-550 from Barrett Precision Aircraft =
in Tulsa.  Was quoted 9 weeks to overhaul, took 5 1/2 months (but that =
is another story).  The good news is that the motor is back in the =
airplane, and looks and runs fantastic.  My problem is, its running hot =
inside my airplane.  The bottom line is - I am looking for suggestions =
on how to solve the problem described below- I have about 600 hours in =
my airplane on the previous engine, have taken the GAMI course, and run =
LOP cross-country almost exclusively.
>=20
> Motor installed and test run.  Every effort to try and install exactly =
like it left - only exception is spark plug wires installed below the =
air tubes (they were on top before - I don't know why the mechanic put =
them underneath). No problems with Cowl off. =20
> First flight - one pattern only - Max MAP was set too low, low fuel =
flow - fixed.
> Next flight - 10 minutes - Cylinders 5 and 6 temps run away hot at =
38.5 MAP and 45gph.  Must retard throttle to less than 25gph (25ish MAP) =
to keep under control.
> Third flight  - after checking baffling for hours and scratching head =
- same deal.  Fly for 1 hour full rich at low power settings.  Motor =
very smooth and happy at low settings, but as soon as throttle pushed =
in, cyl's 5 and 6 climb at about 1 degree per second - power always =
retarded not to exceed 390 and cool down in the 350-360 range before =
trying to push up power again.
> Fourth flight - today - a 2.3.  Takeoff WOT and full rich.  Can't get =
above 3000' agl before having to pull power for cal 5 and 6.  Pull power =
to 25gph/25 MAP/Full rich and slowly climb to 10.5k MSL.  Fly there for =
a while, cylinders all look great in the 340-350 range.  After an hour, =
try full power climb, have to stop within 1500' of climb.  So then I =
leveled out, and set my typical speed cruise LOP mode to try something =
different - 34MAP, 2500 RPM, 18-19 gph.  Motor is very happy.  All EGT's =
normal (actually less than previous engine by almost 100 deg), CHT's all =
between 340-365.  I climb with this setting to 16.5 and cruise for =
another hour, no problem.  Return to base, set full rich/2700 rpm, and =
land normally.  At retarded power settings in the pattern, motor stays =
cool and happy.
>=20
> So what to look at?  New motor mounts make the engine sit noticeably =
lower in the cowl, and we are checking the rear baffling to make sure =
there is a good seal, but would that affect the front 2 cylinders (5 and =
6)?  Every other indication (including the other 4 cylinder temps) are =
totally normal.  Any other suggestions out there to look for? =20
>=20
> Appreciate your experience
>=20
> Bob Rickard


--
Lorn H. 'Feathers' Olsen, MAA, ASMEL, ASES, Comm, Inst
DynaComm, Corp., 248-345-0500, mailto:lorn@dynacomm.us
LNC2, FB90/92, O-320-D1F, 1,800 hrs, N31161, Y47, SE Michigan