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I set our engines up to run a 50/50 AV & non-ethanol premium mix. It's easy to get, not too expensive, has decent octane rating and is consistent as I buy from same places every time. Since our bikes are set up for it they run great. But put that same fuel in a high compression engine and it may have problems & in a stocker may lose power.
It's my understanding that the only real "power in a can" is oxygenated stuf but even then your jetting is going to change.
We run the above fuel in TC85, TC105 & a couple of TC125's among other things. Pistons wear great and bikes run stellar............
Non ethanol pump gas and add this octane booster / fuel stabiliser
https://www.nulon.com.au/products/pro-strength-additives/pro-strength-o…
The Shop
I switched to T2 because it’s actually cheaper for me (buying by the drum and keeping a N2 blanket on the fuel so it stays fresh) as I don’t have to add oil. For the same day, just switching C12 to T2 I’m +2 sizes on the main jet, due to oxygenation in the fuel. It makes more power but I feel like I’d be lying if I said it was SUPER noticeable.
I did try 100LL in a Fi 450 once for kicks, no mapping changes, and as to be expected it was noticeably worse than pump.
If you think C12 premixed smells good (I found 100LL to be the same scent), T2 smells heavenly. Could never justify it though if I was paying 70-80$ for 5 gallons though.
All anyone has to do is look at the SDS of any race fuel or Av gas to see 100LL is basically a low lead racing fuel.
Same with garbage octane boosters.
Look at the SDS.
The best octane boosters are found in quart and gallon steel cans at any local hardware store or chemical house on the super cheap.
Whoever posted 100LL has all this lead is wrong.
It has about 1/2 the amount of C12 and 1/4 the amount of say C16 or higher. Which is around the same amount as the old 110/130 and 115/145 Avgas.
Fuels SDS is the truth behind the myths.
Fancy labels sell. 4.25 per gallon Av gas is the best thing going for a non ethanol fuel.
Also, Av gas has no deicers. The fuels ingredients having ~ -70 and colder freeze points are automatic deicers just by being gas.
And it's not made for high altitude.
Guess where a plane uses max power and has a max load on the engine?
At sea level during take off.
Same as you when trying to take flight over a triple out of a turn.
For decades, Av gas was the base fuel for many blends of race fuel.
Just read the white paper from Phillip's 66 who sell Av gas, and sold race fuel under the brands Trick, Phillips, Track-Tek etc.
It's a rip after reading the SDS for it. You can buy a gallon of the active ingredient in it for the cost of 1 bottle at a chemical house.
Plus I have zero need to run kerosene.
I tell everyone to read the SDS for any fuel or junk octane boosters and see what you are really buying. Unless super oxygenated race fuel, there is nothing special about race fuel except the amounts of specific ingredients.
The best octane boosters are available where I posted for super cheap. It's just not labeled "octane booster"
Fools buy octane boosters with fancy labels.
It cannot be used in all airplanes unless spec'ed by the OEM for use so airports with it still sell 100LL.
It is basically 100LL without the lead. It's not available everywhere but my race engines require 93 Min but the OEM preferred fuel is 100LL.
They run at 8-9K for extended times. Plus it smells yummy and costs 4.25-4.50.
The only bike's that I've ever owned that pinged(I've owned dozens) were the 1981 yz465, 1982 cr480 and the 1981 Maico 490. The yz needed some jetting and a little race gas 50/50. The cr ran forever, pinging all the way. The Maico blew up regularly. Every other bike ran just fine on premium unleaded pump gas.
BTW- I am a pilot and Airframe & Powerplant Mechanic ( A&P ).
If they were true, according to the article planes wouldn't start in the cold, and high performance engines would have problems, so that means air race planes would be falling out if the sky.
And it's pretty well known aromatics don't cause rubber problems but alcohol does, which av gas has zero.
Also, where it states there is a chemical package for high altitude, I would love to see that on any brand of Avgas SDS.
Because, well, they are available to anyone and there are no special chemicals.
It is nothing more than a 100 Octane race fuel when you compare SDS sheets showing the ingredients.
In fact, my airport has SDS's available right at the pumps for anyone.
I'm having good luck with UL94 and soon UL102 Avgas will be available.
Probably be more $$ though since TEL is cheap.
You left a lot out:
1. The Maico was gonna blow up anyway
2. The Honda "sorta pinged". It was the '84 500 that REALLY pinged!
3. I thought that Yamaha simply needed "resquishing"?
Great post, well...
Except that part at the end where you admit to not working very hard (Yes, I'm an aviation smart ass, myself).
Pit Row
Yes, I am aware of the UL94 and UL102 offered by Swift Fuels: https://swiftfuels.com/fuel/unleaded-ul94-avgas/
I run 2-strokes, so the 100LL @ 50/50 with E0 90-93 with Maxima K2 @ 32:1 is nice for my CR125s.
There is an airport within 20 miles that has the UL94. Based on approximation with it having a MON of 94, it has roughly a (R+M/2) of around 98 octane.
I am gonna burn up my last few gallons of 100LL and give the UL94 a go to see what transpires.
Post a reply to: 50/50 avgas mixed with 95?