LettersFromFlyoverCountry
Well Known Member
I just finished with Mike Busch's excellent advanced leaning webinar from EAA (I'll write up notes and share them on the blog later), but this one section caught my attention.
Here's what he said:
That surprises me because I think I bought my engine in 2008 from Mattituck and I'm pretty sure (I'm not out at the hangar) that it still has a data plate for 25. I've heard nothing about this before that.
Can anyone enlighten me on this assertion?
Here's what he said:
Lycoming originally specified that all of their IO-360 engines be timed at 25 degrees before dead center and they had lots of problems with high CHT. It?s a company that traditionally has said ?don?t worry about CHT? but eventually these high CHT were manifesting themselves in detonation damage so Lycoming respecified all timings to be 20 before TDC instead of 25.
That surprises me because I think I bought my engine in 2008 from Mattituck and I'm pretty sure (I'm not out at the hangar) that it still has a data plate for 25. I've heard nothing about this before that.
Can anyone enlighten me on this assertion?