Where I live it's actually easier for me to drive to the airport for fuel than it is to get ethanol free. If I go to a pump I'm stuck with 87 no ethanol, 91 with a little ethanol, E15, or E85.
This would be specific to the Moster 185 Plus.
Posted Sep 19, 2017, 11:44 AM UTC
The benefit to AV gas is that it's stable longer than pump gas in a gas can. That being said, Vittorazi recommends unleaded gasoline and AV gas contains lead that could potentially cause buildup of lead deposits inside the engine or on the spark plug that could cause fouling.
Ethanol in fuel isn't really a problem for newer motors as long as you burn it within a few days. The problem with ethanol is that it tends to absorb water into the fuel mixture after several days, then phase separate into 3 different layers. That leaves you with a layer of gas on top, ethanol in the middle, and water on the bottom. Engines don't like to burn straight water. If you use 91 unleaded with ethanol try to store it in an airtight container and burn it within a week.
Realistically, you're probably just fine with either unleaded 91 or AV gas, but adjust your carb if you switch between them.
Yeah, I use AV gas in my Thor motor.
Any changes to oil mixture, jets or tuning?
No changes, but tune the carb jets/needles anytime you change fuel. Also, Av gas doesn't smell as bad as pump gas.
What he said, no changes. I'm really thinking about flying this winter, which will necessitate some changes. AV gas doesn't really go bad, like he said, doesn't smell, 10 min later you can't tell it was on your hands even. I love the stuff.
https://www.miniplane-usa.com/tips/fuel.htm
"AVGAS can be used but you will experience more engine maintenance due to deposits forming in the combustion chamber and, perhaps, more wear of the crankshaft bearings (we have not noticed this, however, in our engines)"
"I started flying a Cessna172 at the age of 15. Yes it's great stuff for larger motors as I stated in a few posts, I burn it in my MZ 34. You say you have used it in everything? I'm only talking about it not being a good idea in the Top 80 as I have had enough pistons in my hand with a stuck or partially stuck ring to say No to Avgas in the 80.
Most people don't even know that the ring is stuck! Others say they use Avgas but they sell the motors around 50 or 60 hours, the one that came in today had only 50 hours on it the ring was stuck! I have yet to talk with anyone with a Top 80 that has used Avgas long term without issues."
Personally, I felt that the engine was less testy/sensitive with the avgas. but because of these statements, i made the switch back to ethanol free.
The new synthetic oils we have basically act as a stabilizer to fuel...I parked mine all winter and it fired right up. Had the carb apart and it was clean as a whistle. I try to avoid Ethanol but I don't think it matters that much with these new oils they are making. Use premium unleaded ethanol free gas....but I'd rather burn ethanol than AV gas...there are some seriously small tolerances that lead can build up on, plus the worst place for lead deposits are in your silencer. Those are really touchy. Long live AMSOIL (no I'm not a dealer)
Had 2 Moster Plus motors and the first one HATED AV Gas after about 30 hrs and I was done with it
My experience is the same. Ethanol or not, mixed gas runs perfectly fine even after a few months. These engines don't have the compression ratios to burn AV gas properly anyway, they'll be a bit down on power on AV gas.
Which Amsoil do you run? Red Line or Stil HP Ultra burn really clean and handle heat well.
I run Saber. I used to run Dominator but switched to Saber when some of the paradigm team pilots turned me on to it. It seems to be awesome, I've never heard of Red Line or Stil HP Ultra. Usually I have at least heard of the oil pilots are using. Do you have a group of guys using those oils?
Coming from RC flying and Dominator at 100:1 was less than ideal, people liked Saber though. The other two are the standard for RC in 30-300cc 2 stroke gas group.