Dyno results!!

[Topless]

Originally Posted by shadrach74

I never said that his number accurate. What I said is that it's unlikely that his engine would not run at an AFR of 18:1.
With an 11:1 compression ratio and pump gas, an m96 motor will ping like a big dog at 18:1 A/F ratio under full load on a dyno. Narrow tuning window. It may run.... for a little while.

And yes, I do much leaner than stoichiometric (14.7:1) all the time when running a 360CI, magneto timed (fixed @25BTDC) air-cooled flat 4 with the throttle wide open. Can you guess the application?

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.

[shadrach74]

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.

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.