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#1
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CHT recommendations
I had an odd thought while flying yesterday.
Traditionally, we have had CHT info on one cylinder. Now, many planes have monitors that tell us all 4 or 6 cylinders. I have been trying to keep all my cylinders under 400 as I believe most of us are doing. However, I had a thought about that number. Is that a number that is best for all cylinders, or was it a number that had a buffer built in because you never new what the other cylinders were really doing? IOW are we now running too conservatively? My number 2 cylinder wants to run up to 405 or 410 when the rest are at 385 (75 ROP, 1425 EGT). I have done EVERYTHING except take out the jug to figure this out. One AP noted that I would never have been aware of this without the engine monitor and queried whether we were possibly being too worried about it. |
#2
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Same thing here, Cylinder 3 always cruises just about 400 but hits over
that in climbs. Others are about 60F lower. Lycoming factory guy said don't worry about it. I tried baffleing and no change. Dude wrote: I had an odd thought while flying yesterday. Traditionally, we have had CHT info on one cylinder. Now, many planes have monitors that tell us all 4 or 6 cylinders. I have been trying to keep all my cylinders under 400 as I believe most of us are doing. However, I had a thought about that number. Is that a number that is best for all cylinders, or was it a number that had a buffer built in because you never new what the other cylinders were really doing? IOW are we now running too conservatively? My number 2 cylinder wants to run up to 405 or 410 when the rest are at 385 (75 ROP, 1425 EGT). I have done EVERYTHING except take out the jug to figure this out. One AP noted that I would never have been aware of this without the engine monitor and queried whether we were possibly being too worried about it. |
#3
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On Fri, 24 Dec 2004 15:40:02 GMT, "Dude" wrote:
I had an odd thought while flying yesterday. Traditionally, we have had CHT info on one cylinder. Now, many planes have monitors that tell us all 4 or 6 cylinders. I have been trying to keep all my cylinders under 400 as I believe most of us are doing. However, I had a thought about that number. Is that a number that is best for all cylinders, or was it a number that had a buffer built in because you never new what the other cylinders were really doing? IOW are we now running too conservatively? My number 2 cylinder wants to run up to 405 or 410 when the rest are at 385 (75 ROP, 1425 EGT). I have done EVERYTHING except take out the jug to figure this out. One AP noted that I would never have been aware of this without the engine monitor and queried whether we were possibly being too worried about it. Just a thought -- have you looked at air flow patterns inside your cowl and how they cool each cylinder??? You may be getting less airflow around that cylinder than the others. Or some of the fins may be gummied up, keeping that cylinder from cooling as efficiently as the others. I've found that air flows and cooling can be a very difficult problem to pin down. Chuck |
#4
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Dude wrote:
: IOW are we now running too conservatively? My number 2 cylinder wants to : run up to 405 or 410 when the rest are at 385 (75 ROP, 1425 EGT). I have : done EVERYTHING except take out the jug to figure this out. One AP noted Does this cylinder have a sparkplug washer CHT probe? These indicate 30 to 50 deg hotter than the well-type CHT probes with the same actual cyl temp. If this engine monitor is an add-on (even a factory add-on) it may have a washer CHT probe. The tip-off would be a single-point CHT gauge in addition to the engine monitor. -- Aaron C. |
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