Nice, they just published the advance curve. Wonder how this compares to Lightspeed's curve.
Interesting that you only get full 38 degree advance at 2700rpm. Lenny
Only?
This is much more aggressive than Lightspeed. At 2600~2700, a LS won't reach 38 degrees until MP is down to 13". If I read the Surefly illustration correctly, it reaches 38 degrees at 21".
The Surefly map is even more aggressive than an Electroair map.
At high manifold pressure, 25 to 30 degrees was the ballpark for max HP in the only hot-rodded Lycoming "timing vs HP" study I've seen in print.
Might work ok LOP, but it's probably too advanced for ROP operation, in particular near stoich. I suspect it will just raise CHT without going faster.
That's the beauty of the dual map switch on the new SDS ignition, or a homebuilt EDIS....two maps, one for ROP, one for LOP.
In the company blog, Rich says what they heard a lot at OSH was "I just want to get rid of my mags." If I were the Surefly guys, I'd think hard about doing just that...sell a certified EI mag replacement with fixed timing. Sound crazy? Consider...the average schmoo with a Cherokee or a 172 is carbureted, so he has lousy mixture distribution, and can't run LOP with smoothness. He may not run LOP much even if distribution was great; too many scary stories from the local airport peanut gallery. He doesn't fly high either. Those customers would love the easy starting and automotive plugs, but fixed timing wouldn't have a chance of creating a cooling problem. Most of those span cans have awful baffling.