Percent power altitude

"Allen" wrote in message .. .

..... I was just
commenting to John that I have never seen RAM recommend any particular EGT,
only the 1650 degree max. I agree with the rest of your post.

Allen

I don't have RAM's newest engines, but their power charts for the RAM
Series II and RAM Series IV TSIO-520NBs had columns showing EGT's.
Typical row entries are "Takeoff (full rich) - 1450F to 1550F",
"Cruise Climb (85%) - 1450F Calibration Setting",
three different types of "Cruise - 1550F" entries,
"Normal Descent - 1300F min, 1400F ideal", and
"Approach and Landing - 1200F min, 1300 ideal".

"John R. Copeland" wrote in message
...
"Allen" wrote in message
.. .

..... I was just
commenting to John that I have never seen RAM recommend any particular
EGT,
only the 1650 degree max. I agree with the rest of your post.

Allen

I don't have RAM's newest engines, but their power charts for the RAM
Series II and RAM Series IV TSIO-520NBs had columns showing EGT's.
Typical row entries are "Takeoff (full rich) - 1450F to 1550F",
"Cruise Climb (85%) - 1450F Calibration Setting",
three different types of "Cruise - 1550F" entries,
"Normal Descent - 1300F min, 1400F ideal", and
"Approach and Landing - 1200F min, 1300 ideal".

You may want to call their customer service and get an updated power card.
The one I have justs shows "1650 degrees maximum" for the cruise entries.
They are letting you determine what you want to run at. I think you are
operating them in the proper way limiting the EGT to 1525 or lower.

Allen

The airframe maker often modifies the engine and
accessories, thus the POH is the authority. STC'd systems
modify that. So, if you and I keep posting sound advice,
perhaps the rest of the group will develop a higher level of
learning.


"Allen" wrote in message
.. .
|
| "Jim Macklin" wrote
in message
| ...
| Not exactly. It depends on whether the gauge is
calibrated
| to an exact temperature or whether the gauge is used
only to
| find relative peak and degrees above and below. It also
| depends on where the probe(s) are installed. EGT has
the
| probes about 4 inches past the exhaust valves,
|
| On single-probe EGT systems such as on John's Cessna 340
the probe is
| located toward the tail end of the exhaust riser, well
ahead of the turbo
| but past the 4" point. This was determined (by Cessna) to
be the point
| where the exhaust gas is hottest. Cessna POH for the 340
recommends running
| at peak for many power settings below about 62%. Cessna
designed their own
| exhaust systems on their twins, Beechcraft had TCM design
their exhaust as a
| unit with the engine.
|
| Allen
|
|

Bob Moore wrote:
Bob Noel wrote

Bob Moore wrote:
Works out to 76% at 7,500' and 64% at 12,500', or thereabouts.

OK, I'm confused. Full throttle, 64%, is 12,500' for any engine?
How come my cherokee 140 couldn't even get to 12,500'?
What am I overlooking?

:-) The wing, of course. :-)

Bob Moore

Perhaps you need to pedal faster?

(*chortle*)