Engine Mods

The CHTs are too hot. Check your fuel flow, check the baffles. Even
new, you don't want those CHTs that high! That's the recipe for
cylinder problems.

On Mon, 14 Feb 2005 21:11:42 -0500, "Paul Missman"
wrote:


I just had the O-235-L2C in my Tomahawk overhauled, and the 125 HP mod
performed at the same time. Now it is getting 2700 RPM at just under 400
degrees CHT, during break in, and cruising between 100-105 knots. Before
the rebuild, cruise was about 2400 RPM and about 90 knots.

I'm very happy with the engine mod, and would recommend it to anyone getting
an O-235-L2C overhauled.

Paul Missman

Tomahawks are infamous for relatively high CHT's. The modification to 125
hp makes it even worse. I'd say that 400 degree CHT's on a brand new engine
at full power during break-in ain't half bad for a 125 hp Tomahawk.

Paul could post his question to the Tomahawk group in Yahoo, and I think
he'd find that these temperatures are typical or maybe better than typical
for this installation.

KB

"Jon A." wrote in message
...
The CHTs are too hot. Check your fuel flow, check the baffles. Even
new, you don't want those CHTs that high! That's the recipe for
cylinder problems.

On Mon, 14 Feb 2005 21:11:42 -0500, "Paul Missman"
wrote:


I just had the O-235-L2C in my Tomahawk overhauled, and the 125 HP mod
performed at the same time. Now it is getting 2700 RPM at just under 400
degrees CHT, during break in, and cruising between 100-105 knots. Before
the rebuild, cruise was about 2400 RPM and about 90 knots.

I'm very happy with the engine mod, and would recommend it to anyone
getting
an O-235-L2C overhauled.

Paul Missman

On Tue, 15 Feb 2005 21:46:20 -0500, "Kyle Boatright"
wrote:

Tomahawks are infamous for relatively high CHT's. The modification to 125
hp makes it even worse. I'd say that 400 degree CHT's on a brand new engine
at full power during break-in ain't half bad for a 125 hp Tomahawk.

Paul could post his question to the Tomahawk group in Yahoo, and I think
he'd find that these temperatures are typical or maybe better than typical
for this installation.

Never offer up factual information to a demagogue, it's like trying to
teach a pig to sing.

Regards;

TC

"Jon A." wrote in message
...
The CHTs are too hot. Check your fuel flow, check the baffles. Even
new, you don't want those CHTs that high! That's the recipe for
cylinder problems.


Jon,

The engine shop that did the overhaul told me, for the first 10 hours, to
run it full rich, and everything short of either red line or 400 degrees
CHT. With the mod, about 2700 RPM is just below 400 degrees CHT, and the
red line is now 2800 RPM.

I bought the EGT/CHT guage at Ken Blackman's recommendation. He's the
holder of the 125 HP STCs. He recommended the guage, because, he said, in
climb, at 9.3:1 compression, it can get quite hot, very quickly, and not to
exceed 450 degrees.

Normally, the Tomahawk has no CHT/EGT guage. So, I never knew how hot the
cylinders ran before the modification.

Paul Missman

Appreciate the reply, even the blurb from Pope Toecutter the 1st, but
if you have a look at the real data being measured today (the 21st
century) you'll see that the Old Wive's Tales aren't holding any
water. Regardless, you make your own decisions.

http://www.advancedpilot.com/



On Wed, 16 Feb 2005 19:53:19 -0500, "Paul Missman"
wrote:


"Jon A." wrote in message
.. .
The CHTs are too hot. Check your fuel flow, check the baffles. Even
new, you don't want those CHTs that high! That's the recipe for
cylinder problems.


Jon,

The engine shop that did the overhaul told me, for the first 10 hours, to
run it full rich, and everything short of either red line or 400 degrees
CHT. With the mod, about 2700 RPM is just below 400 degrees CHT, and the
red line is now 2800 RPM.

I bought the EGT/CHT guage at Ken Blackman's recommendation. He's the
holder of the 125 HP STCs. He recommended the guage, because, he said, in
climb, at 9.3:1 compression, it can get quite hot, very quickly, and not to
exceed 450 degrees.

Normally, the Tomahawk has no CHT/EGT guage. So, I never knew how hot the
cylinders ran before the modification.

Paul Missman