This is why I threw up the post, so I can get input from those who've done it and know about these types of fuels, so thanks for your input

Has anyone else out there tried the unleaded 100 octane aviation fuel? I'm looking for actual experience and first hand knowledge.

 

Sir, AvGas is no secret mystery fuel. One of my friends has been using AvGas in his Buick GS for over 10 years. If it's safe enough for his classic muscle car then I trust it's safe enough for my EVO on occasion. o2 sensors beware! Plus, it's not like everyone is gonna fill up their car to the top with 100LL on every tank of gas.

 

Glad to be of assistance.

 

Ah, but my point has still been made. A 2003 or newer mitsubishi (or honda or whatever) has a distinctly different engine, fuel mgmt system, etc than some old buick. Basically I just reserved the right to say, "TOLD YA SO!!! " when some dork blows up his engine, kills his injectors, catches the car on fire, and then comes in here whining about his car!!

 

I dont think for 1 tank its going to kill all the gaskets in the car. What are you using the 100 octane for anyways, to putt-putt around in? Nope, your going to be beating the heck out of your car to see the gains you will get from using 100 octane. So, in theory the gas won't be in the tank all that long anyways.

 

i can get some simple Turboblue 115 for $3.65 a gallon in wooster and $4.60 in Massilon so thats what i use.

 

o my.. that made me laugh

 

try it....i bet it wont :lol

 

i have heard that running anything LL is really, really bad. LL means that it contains more lead, than the gasoline that they used to sell in the 60's. i havent tried any of it, but would like to know more, and in a conversation on this board, someone posted that the effects are/could be pretty bad.

 

So since my car didn't blow up, nor did it throw a CEL, and it runs perfectly fine after I put in 100LL, do I get to be the one to say "TOLD YA SO!!!" ??

MY point has been made.

Out.

 

please read the following information before purchasing AvGas:

http://www.idavette.net/hib/fuel/page2.htm


How ’bout AvGas?
The only aviation gasoline of interest to Corvette enthusiasts is "low-lead 100" (AvGas LL100). Because of its antiknock rating and low price compared to leaded racing gasolines, AvGas might seem a good choice for a moderate octane boost, but closer study raises some doubt.

Because of its lead content, AvGas must not be used by engines fitted with modern emissions controls. It renders catalysts useless in short order and will eventually plug them. AvGas quickly damages most oxygen sensors, too.

The sale and use of aviation gasoline is heavily-regulated. Most aircraft fuel dealers refuse to put AvGas into anything other than an aircraft fuel tank. There is a legal gray area that has some vendors willing to dispense AvGas into approved containers if they believe the end use of that AvGas is fueling an aircraft engine. This loop-hole is how some people obtain AvGas for automotive use.

Aviation gas is formulated for large-bore, long-stroke, low rpm engines which run at high altitude. While AvGas’ higher octane is useful, smaller-bore, shorter-stroke, high-rpm, non-cat, Corvette engines requiring 92-98-oct. will perform better on racing gasoline. AvGas has lower volatility so, used in proportions higher than about 40%, part-throttle drivability and cold starts may be compromised. AvGas has a lower specific gravity so it will require a change in air-fuel ratio calibration for the engine to perform at its best. LL100 is blended with a high percentage of aromatics. That reduces throttle response–not really an issue with an aircraft engine but certainly an issue in a high-performance automotive engine.


The "Aviation" antiknock rating system is different than the MON rating. 100-oct. on the aviation scale, equals 98.8 MON. The biggest limitation of LL100, when used in very high-compression or high-boost, race track applications requiring leaded gas is octane. "For those applications, AvGas," Tim Wusz told us, "is short on octane compared to most (leaded) racing gasolines. Many racing engines have more spark advance at low rpm and/or during lean, part-throttle operation than AvGas and even some (unleaded) racing gasolines can handle. The result is detonation."

Bottom line: AvGas is ok in off-road situations were a leaded fuel of no more than 98 octane required, ultimate performance is not important and you can accept possible drivability quirks.


Most small airports that cater to general aviation will sell AvGas through fueling facilities such as this. If you decide to accept the compromises of aviation gasoline, make sure what you buy is "100" or "100LL". Do not use "Jet A". That’s jet fuel, a form of kerosene, and burning it in an automotive engine will cause serious damage. Image: author.

 

That is a good read. I found that last week when I was doing more research on AvGas. Though to me a lot of that article sounds more like theory than fact.

I would like to see a true comparison test between a full tank of 91 octane and a 9gal/91+5gal/100LL mix (which is what I have been using) on a dyno to see the effects that AvGas will have on the EVO's performance.

Will the anti-knock of the AvGas counter the reduction of throttle response? Good question.

In this case their definition of "ultimate performance" is pretty vauge IMO. I think the final outcome of their analysis was that 100LL was not a good replacement for 100 octane unleaded "Automotive Race Gas."

The reason I want to use it is to raise the octane rating on a full tank of gas closer to 93/94 to reduce knock and increase performance to that found in a tank of 91 octane.

 

Ok I work on the line for a Executive Airport in the Bay Area...Basicly I fuel Airplanes for a living.

First off DO NOT PUT 100 LOW LEAD IN YOUR EVO. It will hurt the engine beyond repair.

100 low lead is blue and 100 oct. is green... you'll be able to tell

The nozzels for the Avation Gas (100LL and 100 oct.) will fit into a car but do not have instant shut off so it could overflow....watch it

The nozzels for Jet Fuel will not fit into a car at all...The fuel wont even burn in a car so DON"T try it.

So you know 100 Oct. will run in a car but it puts alot of stress on the engine causing alot of wear and tear. If you want to run 100 oct. you have to find a airport that carries it first off ( most use 100 low lead) and then you have to find a guy that will pump it into your car ( just talk to one of the fueler guys who looks like he'd go for it if he gets a tip) as pumping into any thing but a plane is against regulations.

Have fun but be sure you wont hurt your ride.

 

Just out of curiosity, what makes you say that 100LL will put "a lot" of stress on the engine, hurting it beyond repair? Personal experience?

Like I said earlier, a friend of mine has been using 100LL in his (455ci) Buick for over 10 years. Granted he's got a big cube V8 with no emissions equipment. One would think that the only parts at risk would be those designed for emissions. Do you have any experience running 100LL in your car? I'm looking for facts and personal experiences here, not speculation. Unfortuantely most of what I am hearing on the subject of 100LL is speculation, with the exception of my friend's Buick.

I would not even think of pumping 100LL directly into my car. The nozzle is too large and will not fit into the gas tank. Even if you could fit the nozzle in, I would imagine that if you pump too fast it is going to spray all over the place. I also would not consider running a full tank of pure 100LL. I would definitely mix it up, with no more than 40% 100LL mixed with 91 octane pump gas.

 

if im not mistaken isnt higher octane fuels better on mechanical parts because it burns cooler and knocking is less prone to happen only thing it kills is o2 sensors and stuff like that. it only tears your motor up when u try to push the envelope on it trying to make a dyno queen right?