Aviation Fuel
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Squid
Joined: Mar 2021
Posts: 16
Aviation Fuel
Anyone ever run straight Av. Gas or blended, pump / Av. Gas?
(Av. Gas, 100LL - 100 octane with lead)
”LL” means “Low Lead”, but there is definitely lead.
If so what was your experience?
What bike did you run it in?
-Scott
(Av. Gas, 100LL - 100 octane with lead)
”LL” means “Low Lead”, but there is definitely lead.
If so what was your experience?
What bike did you run it in?
-Scott
Last edited by BluetailHawk; Aug 6, 2024 at 09:51 AM.
Member
Squid
Joined: May 2022
Posts: 35
My experience and opinion is this, if you have a motor that is built to take advantage of cylinder pressure and have adjustable ignition timing, then 100LL would be a suitable fuel.
I've used it in a BMW K bike I used to have; it was the 1200S slant motor of 05-08. The cam in that motor has equal inlet-exhaust profiles of 270 and plenty of overlap; from the factory. It was a 13-1 compression ratio because it could do that with all that timing. It also had primitive sort of vibration/knock sensors on the head that would adjust the ignition curve somewhat for fuel quality.
That being said, running 100LL did quiet down the motor and removed some vibration at all rev ranges. But, I could get the same result by mixing in some syrupy Lucas 3X octane booster in to the fuel if I wanted. So why pay for the extra expense of the Avaition Fuel was my thinking.
Just one more thing; you didn't say why you were asking about 100LL; if you are thinking about using it as a storage fuel then yes, good option. Straight from Shell Aviation Fuels at the local regional airport, Av Gas is what is classed as an extended storage fuel. It will not degrade like other fuels. It is harder on rubber parts than conventional fuel though; harder on, not hard on them. That is one reason why aviation O-rings and the like are so expensive. I've used it as storage fuel(we have just as many riding months as winter months where I live); syphon out the remainder of gas out of the tank, drain your fuel bowls, run the motor a bit with the 100LL, shut off the petcock and whatever else you like to do to the bike and be happy.
I thnk that if you use it in a stock VTR1000F with its low compression engine and comparitively retarded timing then you are wasting your fuel money, probably have less power because the fuel(100LL) burns to slow, and worse of all your head temperatures will probably be higher.
I've used it in a BMW K bike I used to have; it was the 1200S slant motor of 05-08. The cam in that motor has equal inlet-exhaust profiles of 270 and plenty of overlap; from the factory. It was a 13-1 compression ratio because it could do that with all that timing. It also had primitive sort of vibration/knock sensors on the head that would adjust the ignition curve somewhat for fuel quality.
That being said, running 100LL did quiet down the motor and removed some vibration at all rev ranges. But, I could get the same result by mixing in some syrupy Lucas 3X octane booster in to the fuel if I wanted. So why pay for the extra expense of the Avaition Fuel was my thinking.
Just one more thing; you didn't say why you were asking about 100LL; if you are thinking about using it as a storage fuel then yes, good option. Straight from Shell Aviation Fuels at the local regional airport, Av Gas is what is classed as an extended storage fuel. It will not degrade like other fuels. It is harder on rubber parts than conventional fuel though; harder on, not hard on them. That is one reason why aviation O-rings and the like are so expensive. I've used it as storage fuel(we have just as many riding months as winter months where I live); syphon out the remainder of gas out of the tank, drain your fuel bowls, run the motor a bit with the 100LL, shut off the petcock and whatever else you like to do to the bike and be happy.
I thnk that if you use it in a stock VTR1000F with its low compression engine and comparitively retarded timing then you are wasting your fuel money, probably have less power because the fuel(100LL) burns to slow, and worse of all your head temperatures will probably be higher.
Last edited by GreyWater; Aug 6, 2024 at 02:04 PM. Reason: More Info
Thread Starter
Junior Member
Squid
Joined: Mar 2021
Posts: 16
My experience and opinion is this, if you have a motor that is built to take advantage of cylinder pressure and have adjustable ignition timing, then 100LL would be a suitable fuel.
I've used it in a BMW K bike I used to have; it was the 1200S slant motor of 05-08. The cam in that motor has equal inlet-exhaust profiles of 270 and plenty of overlap; from the factory. It was a 13-1 compression ratio because it could do that with all that timing. It also had primitive sort of vibration/knock sensors on the head that would adjust the ignition curve somewhat for fuel quality.
That being said, running 100LL did quiet down the motor and removed some vibration at all rev ranges. But, I could get the same result by mixing in some syrupy Lucas 3X octane booster in to the fuel if I wanted. So why pay for the extra expense of the Avaition Fuel was my thinking.
Just one more thing; you didn't say why you were asking about 100LL; if you are thinking about using it as a storage fuel then yes, good option. Straight from Shell Aviation Fuels at the local regional airport, Av Gas is what is classed as an extended storage fuel. It will not degrade like other fuels. It is harder on rubber parts than conventional fuel though; harder on, not hard on them. That is one reason why aviation O-rings and the like are so expensive. I've used it as storage fuel(we have just as many riding months as winter months where I live); syphon out the remainder of gas out of the tank, drain your fuel bowls, run the motor a bit with the 100LL, shut off the petcock and whatever else you like to do to the bike and be happy.
I thnk that if you use it in a stock VTR1000F with its low compression engine and comparitively retarded timing then you are wasting your fuel money, probably have less power because the fuel(100LL) burns to slow, and worse of all your head temperatures will probably be higher.
I've used it in a BMW K bike I used to have; it was the 1200S slant motor of 05-08. The cam in that motor has equal inlet-exhaust profiles of 270 and plenty of overlap; from the factory. It was a 13-1 compression ratio because it could do that with all that timing. It also had primitive sort of vibration/knock sensors on the head that would adjust the ignition curve somewhat for fuel quality.
That being said, running 100LL did quiet down the motor and removed some vibration at all rev ranges. But, I could get the same result by mixing in some syrupy Lucas 3X octane booster in to the fuel if I wanted. So why pay for the extra expense of the Avaition Fuel was my thinking.
Just one more thing; you didn't say why you were asking about 100LL; if you are thinking about using it as a storage fuel then yes, good option. Straight from Shell Aviation Fuels at the local regional airport, Av Gas is what is classed as an extended storage fuel. It will not degrade like other fuels. It is harder on rubber parts than conventional fuel though; harder on, not hard on them. That is one reason why aviation O-rings and the like are so expensive. I've used it as storage fuel(we have just as many riding months as winter months where I live); syphon out the remainder of gas out of the tank, drain your fuel bowls, run the motor a bit with the 100LL, shut off the petcock and whatever else you like to do to the bike and be happy.
I thnk that if you use it in a stock VTR1000F with its low compression engine and comparitively retarded timing then you are wasting your fuel money, probably have less power because the fuel(100LL) burns to slow, and worse of all your head temperatures will probably be higher.
Gary
Fantastic…
great information.
I work at an airport so i have access to 100LL and have a curiosity about engine performance with LL.
I have 5 gallons of a little less than a 50-50 mix at home. I may for experimental sake, run the fuel through the bike and report back.
Member
Squid
Joined: May 2022
Posts: 35
Thats exactly what you should do; run a gallon of straight 100LL through the bike and get your own experience of how different it runs at various loads and revs. Then run your normal fuel afterwards to verify. Maybe it won't be all that noticable; who knows?
You're not going to hurt anything on the bike by trying it.
Try having a look at the rear spark plug before, during and after testing; see if you can see anything in the way of a temperature difference.
And yes; give us the feedback afterwards.
Happy experimenting.
You're not going to hurt anything on the bike by trying it.
Try having a look at the rear spark plug before, during and after testing; see if you can see anything in the way of a temperature difference.
And yes; give us the feedback afterwards.
Happy experimenting.
Last edited by GreyWater; Aug 7, 2024 at 12:17 PM.
Senior Member
SuperSport
Joined: Mar 2010
Posts: 987
From: Asheville, North Carolina
THREE good reasons that av. fuel ain't a good idea.
1) Aviation is dirty. 104 octane or higher
2)The Superhawk is a 9.5 to 1 , 100hp engine.
3) WHY,? the time of the engine will cause it to run warm to hot,
Truly what the purpose
1) Aviation is dirty. 104 octane or higher
2)The Superhawk is a 9.5 to 1 , 100hp engine.
3) WHY,? the time of the engine will cause it to run warm to hot,
Truly what the purpose
Thread Starter
Junior Member
Squid
Joined: Mar 2021
Posts: 16
Results. Ran just us under a 50-50 mix. Bike had slightly more power. Just a guess here 5% at most…
My normal temperatures on the bike did not increase.
I have a little more mixed fuel that I will run through it to get more experience.
Will switch back to pump gas after.
My thoughts so far is it worth it for the trouble to source, mix and extra money etc. Probably not.
Sure smells good though.
Will check back in later.
My normal temperatures on the bike did not increase.
I have a little more mixed fuel that I will run through it to get more experience.
Will switch back to pump gas after.
My thoughts so far is it worth it for the trouble to source, mix and extra money etc. Probably not.
Sure smells good though.
Will check back in later.
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