110 octane

[Johnson 225]

Would 110 av gas kill an outboard? I can get 5 10 10 gallons of aviation fuel for free but I don't want to burn anything up.

 

[tashasdaddy]

Re: 110 octane

they like unleaded 87 octane. most likely 110 would burn too hot, and damage the pistons.

 

[Dhadley]

Re: 110 octane

Aviation fuel is probably still a low lead fuel so it won't damage anything but it's an overkill. With stock compression you don't need anywhere near that octane. You'd probably lose a few hunderd rpm though.

 

[Johnson 225]

Re: 110 octane

I thought so Thanks for the reply

 

[d.boat]

Re: 110 octane

Does higher octane gas burn hotter in a low compression engine? I really don't understand, but my simple understanding was that it was designed for higher compression engines, it was designed to take more compression to burn. It therefore would actually burn less efficiently in lower compression engines designed for "regular" (87 octane) gas. In my partially-informed mind, I guess I thought it would therefore not burn hotter, maybe less hot?

I'm looking for edification here, not trying to debate - because I do not know enough to debate!

 

[Sea18Horse]

Re: 110 octane

There are a lot of myths / old wives tails concerning octane, avgas and race gas.

First there is no avgas 110. There are three principle types of avgas. Avgas 100 (also often called avgas 100/130), avgas 100ll (low lead) and avgas 82 ul (unleaded) (very new don't even know if it's readily available yet). Higher octane gas burns cooler than lower octane gas not hotter plus it has greater resistance to detonation. It does not have significantly lower BTUs than pump gas however so you probably will not notice much of a loss of power but it would be an interesting experiment.

Avgas 100/130 is dyed green, avgas 100ll is dyed blue and avgas 82 ul is dyed purple so be sure of what your getting. And keep in mind that even 100ll has significantly more lead that even regular leaded gas from recent years. It won't do any harm to a 2 stroke outboard but it's nasty stuff.

Make sure you have a good fuel filter/seperator. They've got to be giving it away for a reason!

Cheers....................Todd

 

[Johnson 225]

Re: 110 octane

My buddy works on airplanes at a small airport when they work on the plane they have to drain the gas out of them. He is allways coming up with 5 to 10 gals a week just thought if it would work I could run it. I just don't want to burn my motor up. It's good clean gas they don't put back what they drain out (I don't know why)

 

[Dhadley]

Re: 110 octane

It won't hurt your motor other than losing some rpm. However, I'd sure find out why they don't want to use it. That may change everything. If it was still good fuel I'd think they'd be running it in their own vehicles a little at a time.

 

[Johnson 225]

Re: 110 octane

He does run it in his stuff I am just getting his left overs. I guess with the aviation regs they can't. They have drums of it and all the mechanics take some home. The next time Im over there I will look at the color.

 

[mthieme]

Re: 110 octane

Theoretically, octane has nothing to do with performance. It is only an anti-knock rating.
The octane rating of aviation fuel is measured differently.

 

[elhombre]

Re: 110 octane

When fuel is drained from aircraft for any reason it is considered contaminated and cannot be legally reused for flight. Key phrase here "for flight"

 

[karlow1]

Re: 110 octane

I will take it!
Just don't put it in your car. It will kill your cat if it has lead in it.
It would not be legal to use it in your car, or bike.
It is legal to use in your boat, mower, genset...
I guess I should check the local airport and see if they have some of that
"bad" gas. At about 2 MPG, any gas is good gas in my Skippy!
Get about 30 Gal, and we can fish Catalina~!

 

[Benny1963]

Re: 110 octane

i used to run it in my kawasaki triple 750 it washard on carb parts

 

[rjezuit]

Re: 110 octane

How about mixing it with "normal" 87 octane 2:1 ratio. That should help you use it up, and keep problems at bay. With 110 octane that should put you roughly at 91 octane.

 

[Randybeall]

Re: 110 octane

One of the many reasons for getting lead out of gas was to clean up our waters. Running this leaded fuel in your boat is contaminating the water. Please do not use it! The heat problem spoken of earlier is heat in the exhaust from the slower burning fuel exiting the combustion chamber unburned. Aircraft engines are relativly low rpm long stroke engines. They give the fuel much more time to burn before the exhaust valve opens. The long burn time gives smoother power through a longer time period. Our high rpm boat engines will loose horsepower out the exhaust because it does not burn quick enough. Try it in your lawnmower, it is an air cooled low rpm engine. Aircraft fuel is rated on a different system, what we used to have before averaging two different measuring systems. For boats unless you have a low speed, high compression engine it is not a good match.