I still have 8 gallons of 110 octane left over from race season(the purple stuff). I was thinking of mixing some up for my 850 promac. Anyone have any thoughts on this?
high octane
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In my experience, if an engine isn't high enough compression to take advantage of the octane, you aren't gaining anything other than using it up.
pen
pen
I wouldn't use it in the saw. It was never designed to run that stuff. Mix it a couple gallons at a time with an 87 octane fuel up for your vehicles. You will end up with a 90-93 octane mix (depending on size of tank).
It ain't worth knocking a hole in the top of your piston.
It ain't worth knocking a hole in the top of your piston.
JOHN BOY
Minister of Fire
rowerwet
Minister of Fire
I do miss the smell of good gas. When at a car show, and notice it, I've had good luck asking the driver what sort of plane he flies, and have been told several times if I wanted any aviation gas for the generator or similar, to just stop by! In the other cases, I've heard, "naw, my buddy flies"
pen
I did the same thing last season with my leftover 110. Used it in my 372xp, 5100s, Husky brush saws and without exception they all ran like crap on race gas. Started very hard, wouldn't idle and poor acceleration. Mixed it down with 87 (around 4:1 87 to 110) and everything ran fine and I still got some of that "race gas exhaust" smell. Since octane essentially controls the burn rate of the gas, my theory was that the race gas simply wasn't "explosive enough" for the 2 stroke motors. Just my experience.
rowerwet
Minister of Fire
the lead in avgas slows down the flame front, without lead high octane isn't what the motor is designed for.
From a pure 'technical' standpoint, the higher the octane, the less energy the fuel contains per gallon. Theoretically, if you run higher octane gas in your car you will get worse gas mileage than if you would have run 87 octane. And the higher octane fuel is less prone to detonation (i.e. it doesn't burn as well) which is why it is required for higher compression ratios (think about diesel engines, they have 30:1 or so compression ratios and make a lot of power/torque but lighting diesel fuel with a match isn't like with gasoline). So it really isn't a surprise that running 110 octane gas in an engine designed for 89 octane would be hard to start and run like crap. We just associate higher octane gas as the "premium" gas and therefore think it should have more power and somehow make our normal engines run better which is not the case.
Bigg_Redd
Minister of Fire
Same here. While higher octane in and of itself may do little for the average low compression 2 stroke engine, it has other advantages that make it worthwhile IMO. In addition to the aforementioned, the other advantages include - quicker revving, easier starting, zero carb-gumming, and indefinite shelf life.
Bigg_Redd
Minister of Fire
Same here. Have had zero issues with it and love the fact that i can mix it up and forget about it till I need it. When I need more I just run down to the local small airport and get more, It's pay at the pump and usually nobody is there.
CenterTree
Minister of Fire
rowerwet
Minister of Fire
work for a company that sells it, per faa regs the trucks and tanks must be sumped daily, the guys who sump it leave the buckets for me. I share it with anybody I know who wants it.
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