I'm breaking in my new engine, and of course I'm totally stressed about CHT. I spent the last few days reading most of the relevant posts.
My engine shop has been great, and they indicated that my spark plug ring temp probes should read 15-20 degrees higher than a true bayonet probe in the head. I saw temps first flight around 438 on the hottest cylinder, second flight was going to be yesterday, but I saw 458 on the hottest cylinder. Of course, I put the nose down, made sure I was full rich, and temps came down into the 440 range, but I went ahead and landed and pulled the cowl to check everything.
Google (the most dangerous phenomenon known to facts) shows people claiming that the spark plug style sensors can be as much as 40 or 50 degrees hotter than the bayonet style. If THAT is true, I shouldn't have much to worry about.
My engine guys have been awesome, and I don't want to second guess them, but I'd sure have more peace of mind if someone had firsthand experience of running a bayonet AND a spark plug thermocouple and knew real numbers of how much they vary?
I didn't find any real concerns with baffling or anything, so I'm gonna go back up this weekend for a long x-country if all goes well. Would love to not be sweating the temps!
Thanks!
My engine shop has been great, and they indicated that my spark plug ring temp probes should read 15-20 degrees higher than a true bayonet probe in the head. I saw temps first flight around 438 on the hottest cylinder, second flight was going to be yesterday, but I saw 458 on the hottest cylinder. Of course, I put the nose down, made sure I was full rich, and temps came down into the 440 range, but I went ahead and landed and pulled the cowl to check everything.
Google (the most dangerous phenomenon known to facts) shows people claiming that the spark plug style sensors can be as much as 40 or 50 degrees hotter than the bayonet style. If THAT is true, I shouldn't have much to worry about.
My engine guys have been awesome, and I don't want to second guess them, but I'd sure have more peace of mind if someone had firsthand experience of running a bayonet AND a spark plug thermocouple and knew real numbers of how much they vary?
I didn't find any real concerns with baffling or anything, so I'm gonna go back up this weekend for a long x-country if all goes well. Would love to not be sweating the temps!
Thanks!