T-ster

Years ago when I was flying the 80-100 cc gassers, I used 100LL Avgas. Since the whole 9/11 thing, the airports are much less likely to let you use the stuff outside of an actual full size aircraft.

When I switch over to 93 octane stuff, will I need to richen or lean the mixture?

Tired Old Man

My Feedback: (1)

Likely you won't notice or have a difference.

soarrich

My Feedback: (98)

I think think the only difference is the 100LL can sit forever, I had some pump gas go bad in two months. It when so bad that my snow blower wouldn't even cough, I drain the gas and put fresh gas in, it fired first try. In NJ they put a lot of alcohol in it in the winter, I heard, but can't confirm that's bad for the Walbro carbs.

pe reivers

Octane ratings if obtained by lead additives (like in Avgas 100LL) have no influence on jetting. (no model airlane engine needs such high octane numbers)
If high octane has been achieved by adding methanol, the jetting probably would have to be leaned out.

Jezmo

I don't have to change my G26 when I go from 100LL to 93 and back. I prefer the Avgas because as mentioned above it doesn't go bad as fast. However,,,,if I ain't got no 100LL I'm a goin' flyin' so 93 it is until I get time to go get some more Avgas. I've also run it on unleaded Sunoco 98 octane race gas. It doesn't have any alcohol in it so no carb setting change there either.

wesaysoracing

i wonder what the sunoco 110 race gas we use would do it one, and no it does not have any methanol in it

J17HENRY

I have been running citco 110 have not moved needles plus it dont stink up my trailer.