914 EGT probes

by Tom Steinbrenner in General Tech Discussion 9 years ago

On the 914 exhaust manifolds it looks like there are bungs welded on each one with a steel cap. It appears these are for EGT probes. If, so, is it best to out a probe on each exhaust (4)?

Re: 914 EGT probes

by Roger Lee » 9 years ago

Roger Lee

126 5.14k 4.58k

It would be the best way, but at least two usually on the back two cylinders.
If you have the ability for 4 on the 914 then I would do it.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell

Thank you said by: Tom Steinbrenner

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Re: 914 EGT probes

by Rob Seaton » 9 years ago

Rob Seaton

3 1.32k 240

I would only use the back two EGTs (or both fronts, whatever is better for your installation/cowl). I will give you a good idea of how the carbs are operating in comparision to each other without increasing the pilot workload.
4 EGTs will always look confusing at various rpm's because of the unequal length induction system.

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Re: 914 EGT probes

by Rhett Mitchell » 9 years ago

Rhett Mitchell

8 99 0

I have 4 probes on a 912 and as Rob said they are at times reading quite different, front cyls to back cyls, in the different states of flight.
Ultimately, they even out in cruise which I imagine is what should happen.
I enjoy having all 4 but if I had to choose 2, I would want one front and one on a back cyl or two rear cyls.
In my application the rear are quite a bit hotter in climb.

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Re: 914 EGT probes

by Roger Lee » 9 years ago

Roger Lee

126 5.14k 4.58k

If you have two or four EGT probes remember these should be regarded as being in the proper range for temps and not absolutes exact temps. These temps will all change with throttle position. They could be equal or they could be 80F+/- difference with different throttle settings.

If you keep the idea of a temp range in your head versus an absolute temp reading you'll sleep easier at night.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell

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914 EGT probes

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