Does anyone have any idea if I can run 100 Octaine fuel in my Hemi, I cna get the gas from the airport and it isn't much more expensive then running 89. Ifigured it be fun to try adding airplane fuel to the Hemi... Any thoughts?

 

Yeah! Do it! It'll take off and fly!

No, but seriously. You to might want to enhance your 89 octane with it.
But running 100 will probably be out of the parameters of your engines computer causing it to run badly.
Or it'll want nothing else but; and when you run the 89 you'll get that dreaded ping in your engine.

 

As long as it is still unleaded, but I would use half 87 and half 100.

 

If it's a fairly stock hemi there's no reason to run higher octane fuel than 89. If the fuel is oxygenated you'll need a custom programmer for it to run properly.

 

the 89 fuel here is all ethenol ****. otherwise i get 87, and 89 i hate corn fuel....

 

To quote the O/M, "... 93 is not recommended..." 100 won't provide any benefit. I guess if you mix it with ~70% 87, it would roughly equal the 91 that is optimal. I just mix 87 and 93 50/50 at Costco or use mid-grade.

 

Not sure if they have some sort of special 100 octane fuel where you are, but the most common 100 Octane AVGas out there is 100LL Which is "Low Lead". The lead is NOT that low (The same as what used to be in Auto gas) and will damage your O2 sensors, plugs and cats quickly. And by damaged i mean, need to be replaced. It is light blue in color and will be well marked as 100LL Do NOT use it in your truck.

It's not going to give your truck any more performance then 89 unless you modify the engine to take advantage of it. Higher Octanes are used as race fuels becuase those engines are built with very high compression. A Factory Hemi is not. The octane rating tell's you how much energy it takes ignite the fuel, not how much energy it will deliver. That value is essentially the same in regular, mid-grade, and premium gas. You can damage your vehicle if you use a fuel with a lower octane rating than the engine needs, but you won't derive any benefit from using gas with a higher octane rating. You will pick up ZERO performance. Using 100 octane leaded fuel in your truck will not damage the engine, but as i mentioned before, it will wreak havoc on emmisons and plugs.

 

^^ What NV290 said. Most airplane fuel I know is called 100 Low Lead. Not safe for cats.
My buddy has a hanger at the Albany International Airport, and another at South Albany Airport and has acess to the fuel. Both are 100LL.

He's put 5gal in his truck before and mixed it with 15gal of regular blend gasoline. He claimed to notice a difference, but who knows. When you hear old timers saying that their old cars would scream, that is because they were carburated and ditributor cars where the timing could be advance for such increases. Computerized has a set timing and spark curves.
I would love to have a continued flow of 100LL for all my small engines like Lawnmower, snowblower...etc Makes them run great and start super easy and stay cleaner internally. The LL actually provides extra lubrication as well. The spark plugs would need to be refreshed more often due to deposition.

 

thanks for all the info. Just though it would be sweet to run it. We don't even have 91 here. we get 87 or 89 or diesel. thats all our choses.

 

All your truck needs is 89, so you are all set. Even running 92 octane is a waste.