RickB
Guru
- Joined
- Oct 20, 2007
- Messages
- 3,804
- Vessel Make
- CHB 48 Zodiac YL 4.2
It would seem to me the distance from the closest exhaust valve to the "elbow" would vary considerably and give various results. Dosn't varying the distance from the "fire in the hole" to the pyrometer vary the results? I would think the position of the thermocouple would effect the readings. I put a custom aftermarket SS high rise exhaust on Willy that may have moved the "elbow" 8 or so inches "down the pipe" (up) from where it was.
The temperature away from the exhaust valve is hotter than where the manifold connects to the head, particularly on turbocharged engines.
It doesn't matter what the exact temperature is, you just want to know what it is where you are measuring it when the engine is working at maximum load. Once you know what that temperature is you will be able to tell when you have exceeded normal maximum load. You are looking for relative temperatures, changes to the normal, unexpected deviations. Most of us here are not thermodynamicists, you might be but I am not.