Quote:
Originally Posted by Topless
Sounds like a Lycoming 0-360 variant. A fine aircraft engine with a very wide tuning window. With an 8.5:1 compression ratio and avgas it will probably purr like a kitten at 18:1 A/F ratio. It won't be making max power though. My father was an aerospace engineer and certified aircraft mechanic. We rebuilt a few of these in our garage when I was a kid. I am guessing you still prefer to do your sea level takeoffs at full rich. 
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IO 360-A1A (8.7CR) to be exact, Most carbed 360s don't like lean ops. I've experimented with full throttle "lean of stoic" take offs and had no issues, performance takes a bit of a hit obviously, but it runs quite cool that way. I prefer full rich take offs because the work load is lighter... but again I digress, this is for another forum!!!
Incidentally the big Turbo'd Continentals will run 90% power all day long when lean of stoic running 34 to 35 inches of manifold pressure.
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