Yr Right:
**it will be at its hottest as it passes though to get to lop buy that time its already started to be damaged**
1) So, at what mixture is the exhaust valve the hottest?
2) And, is exhaust valve temperature related to EGT?
Ozgrade3:
Yes, the reason Piper went to the smaller circular cowl openings was to address what I posted earlier about airflow under a cowl.
Brian:
There are a couple of minor errors in the post you made… mainly because we can now measure things a bit better than we could when that was written. Over all, it's a good treatise on valve health.