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26
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11/22/2022
Location
Palmdale, CA
US
Edited Date/Time
11/25/2022 12:00am
Hey guys I have a 2014 yz250 2 stroke I had vp T2 in it and it was about just 1 gallon once it finished I out 91pumo gas with castor927 oil mix and it just runs more aggressive and less power more having to shift now and I've been seeing people say I can run 100LL would u guys say yes I can run that for racing and practices at the track?? Because vp is just to expensive and if yes I can run 100LL is it just all 100LL or do I do 50 avgas and 50 my gas mixture with the oil and also at the gas station for avgas is there a option for 2 stroke or 4 stroke gas or it's all the same 100LL works for both bikes??
The lead is bad for you though in the long term. 100LL has lead levels comparable to automotive gas in the 70s, which numerous studies have shown to cause health issues (brain damage, lower IQ, chronic illness and increased mortality, etc). I’d probably just stick with pump gas and race gas blends.
The Shop
You are not going to get the same power as T2 though, no matter what ratio you try.
Jetting and a head mod can make good power on 50/50
If you have ethanol free gas easily available, mix 50/50 with Avgas. Otherwise, run straight Avgas so it's ethanol free and you have no carb gunking issues.
Ditch the Castor-927 and run a good synthetic oil. K2, Super-M, Motul 800, Motorex Crosspower 2T, take your pick.
I'm in AZ and can walk into the local airport and fill jugs or even drive in for a drum fill if I need to refill a drum.
It’s very consistent fuel octane. So great for jetting etc.
Pit Row
Please do NOT post false info. 100LL has about .5 grams per liter, which is about half of VP C12, and 3 times less of say C16 which around 6 grams per gallon(at last I saw a SDS.)
Exxon Mobils 100 LL Spec is
Tetraethyl Lead, mL/L 0.27 Min. / 0.53 Max.
The American Society for Testing and Materials (ASTM) specifications limit the maximum amount of lead contained in 100LL avgas to 2 grams per US gallon, which is equivalent to 0.56 grams/liter.
You can see this is roughly half of VP C12. C16 last I looked was 6 Grams per gallon.
VP and most others have to post this info in their SDS sheets. Easily Verifiable.
If you compare a 100 Octane leaded race fuel you will see it is very much the same as Av gas.
Common info is, AV gas has NO real de-icers. Gasoline itself freezes(slushes) at around -70F depending on the hydrocarbon blend.
Most Av gas, Exxon Mobil, Phillips 66, Chevron, Warter, etc is mostly the same and outside of F1 fuel regulations is one of the most tightly regulated fuels in the world.
Av gas is NOT "Dry" Meaning it runs dry with no lube. Gasoline is dry by itself(Washing parts etc)
The dry term comes from the fact that all pumps, pump trucks etc usually have a dual water filtration system, resulting in a water free fuel.
There is no alcohols in Av gas.
Unleaded Av-Gas is 94 Octane. Swift Fuels is the only one that I know with an approved Unleaded Av Gas for SOME approved Engines.
All refineries are working on an approved 100 Octane Unleaded. They have it, but needs to be approved.
Av Gas is not a high elevation fuel. Airplanes Need Max power, and need to resist detonation at FULL throttle, High Load, at Sea Level. At cruising altitudes, you are not at full throttle.
Warter Still sells 130/145 and 115/130 last I knew.
Av gas is a very stable fuel(2 years sealed can) and again, very consistent anywhere you buy it.
If you have questions, feel free.
Lots of these are found in paint stores and chemical houses(with questionable freshness). There is not a lot of secrecy in blending race fuels until you get into highly Oxygenated, extremely high priced fuels.
Alot of these ingredients can still be found by carefully researching SDS sheets, and or looking up CAS numbers.
Never buy little bottles of "Octane Boosters" without reading labels. Most are an overpriced blend of things(Or one cheap hydrocarbon) you can buy a gallon of for the same price, right in walmart or hardware store.
You could technically blend an unleaded race fuel with simple things from a paint store, but you need to do some research on the amounts used. You could for example take a pinging YZ 125 and quickly blend in enough octane to cover that.
If you look at the ingredients of any refinery brand of Av Gas, the SDS will show the percentage uses. Again, this is a very tightly regulated fuel worldwide.
Some airports do not care about a tail number, as long as they can see you are not filling up a Street vehicle like an old muscle car. That would get them in trouble.
My local airport has no problems with Jugs or even drum. Sometimes you simply have to tell the guy in the FBO or fuel truck it is for your race bikes or whatever.
Lastly, Av Gas WILL make more power than pump gas in a hopped up engine, ie high compression, more timing etc.
Lastly, for the price, you will not find a higher quality, stable, or better fuel for most people, outside of highly oxygenated high priced specialty fuels.
When a magazine tells you that Av Gas is for Low RPM engines at high elevation, I say just compare a SDS to say one from your favorite 105 or 108 Motor Octane high dollar race fuel and see exactly what is the difference.
Again, it won't be long until there are many approved 100 UL Av Gas. Only SWIFT fuels(Until recently that I know of) has a 94 UL which is basically 100LL with Zero TEL.
Without lead, to achieve the same performance you have to exponentially increase price.
This is also been the hangup with 94 UL and 100 UL Av Gas specifically which again, is not yet approved last I checked. Although 94UL where available is pretty reasonable considering the limited engines approved for it currently and only 1 refinery is producing an approved fuel, and only for certain lower compression plane engines.
Most of the extremely high octane race fuels have lead, all the way up to say VP Air Race. Read the SDS info sheets.They are readily available.
Warter Aviations 130/145 or whatever it is now isn't cheap and is intended for P51 type race planes. I don't know of any higher octane fuel or any fuel that is even close being unleaded.
Most hydrocarbons are topped out at around 115 alone. Once blended with others with lower numbers, you now have to add lead to get the detonation protection back up depending on the application.
Lead has it's place, and for 100LL, it is a happy medium between a little bit of lead and a higher cost Unleaded product.
Believe it or not, End User cost is a big deal to plane people, especially now with fuel prices.
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