ORIGINAL: cmoulder
FWIW, I am having excellent results with 89 octane pump gas.
The thing I like about my current set-up is that it would be super easy for anyone to replicate... everything off-the-shelf, straight up, no special handling.
Something to be said for K-I-S-S!
Bob is exactly right....It may be time to summarize the findings:
We have
developed a pretty good cookbook
recipe for success with this engine:
Pipe:
ES 30G or 40G; set the baffle at least 27" from the plug center, straight line
Header:
Macs 2 1/4" rise for the OS 140; holes drilled out to 5mm and the clearance holes cut to 8 mm
Fuel:
Regular gasoline with Amsoil Saber pro, or other reputable synthetic, 50:1 to 100:1 mix ratio
Props:
18.1x10 apc; the latest finding is Bob's 15.5x12W; the venerable 17x12 works well also
Ignition:
One may use a separate battery and switch harness but most of us are using Ed Alt's Ignition Battery Eliminator and plug it into a switchable channel on the RX. One turns the ignition on or off using the TX when using the IBEC
It's that simple.
I intend to continue experimenting to try to find the outside edges of the running envelope. But in meantime, anyone who wants to have immediate success with the SAP 180, use the recipe above