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  #1  
Old 10-20-2004, 07:04 PM
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Default Can any one tell me about the fuel you buy at the airport high comp race use ok?

Hi, I have a high compression snowmobile ( my friend wants to know if he can run it in his drag bike also) that needs around 112 to 116 race fuel, I have a airport that sell av gas or ab gas I forgot what the pump said, I was wondering if I could run this in the sled safley, I know people that do run. Thanks a lot
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  #2  
Old 10-20-2004, 07:50 PM
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Default Can any one tell me about the fuel you buy at the airport high comp race use ok?

I have heard about people running airplane fuel in there quads before... Some people do it, if it is good for the engine or not i dont know.
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  #3  
Old 10-20-2004, 08:06 PM
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Default Can any one tell me about the fuel you buy at the airport high comp race use ok?

Read away.....

http://www.groupk.com/tec-gas96.htm
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  #4  
Old 10-20-2004, 08:23 PM
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Default Can any one tell me about the fuel you buy at the airport high comp race use ok?

I JUST RAN SOME IN MY LT LAST WEEKEND ADVANCED THE TIMING AND THEW SOME IN, I HAVE A CUT HEAD SO STOCK TIMING AND PUMP GAS= KNOCK, LETS JUST SAY ITS NEVER PULL UP THAT HARD BEFORE
IN 4 STROKES ITS FINE MAYBE SOME BUILD UP OF DEPOSITS BUT NOT LIKEY IN 2 STROKES THERE ARE "THEORIES" THAT IT IS NOT GOOD FOR 2 STROKES.
I DID SOME RESEARCH BEFORE I RAN THE STUFF
THEORY1 THE ANTI FREEZING AGENTS CAUSE IT TO NOT MIX WELL WITH OIL- IT SEEMED TO MIX JUST FINE WITH THE AMSOIL I'M RUNNING
2 IT HAS ENGINE CLEANING AGENTS THAT SUPOSIVLY CAN TAKE THE OIL LAYER OFF YOUR CYLINDER WALLS AND BEARINGS- WELL ANY ONE WHO HAS MIXED GAS HAS POURED A LITTLE GAS INTO YOU MIXING CUP TO GET THE RESIDUE OFF WELL WE DID IT WITH AV-GAS(100LL) AND THEN WITH 91 PUMP NO NOTICABLE DIFFERENCE.
3 BECAUSE AIRPLANE ENGINES RUN AT A FAIRLY LOW CONSTANT RPM IT IS DESIGNED TO BURN TOO SLOW FOR HIGH REVVING 2-STROKES- WELL THE HIGHER THE OCTANE THE SLOWER AND MORE COMPLETELY IT BURNS AND WHEN I RAN IT I HAD NO LOSS OF TOP END AND NEITHER DID MY BUDDY IN HIS MILD BANSHEE, THE ONLY PROBLEM HE HAD IS IT WOULD HESSITATE JUST BEFORE POWER BAND BUT HE ALSO DOESN'T HAVE HIGH COMPRESSION AND DOESN'T NEED TO RUN THE STUFF.
I DID NOT REJETT TO RUN THE STUFF I HAVE HEARD YOU MAY HAVE TO BECUASE IS HAS A DIFFERENT SPECIFIC GRAVITY, BUT I HAVE HEARD OF MANY PEOPLE WHO DID NOT HAVE TO REJET
IT DOES SMELL QUITE DIFFERNT BECAUSE IT IS A LEADED GAS.
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  #5  
Old 10-20-2004, 09:03 PM
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Default Can any one tell me about the fuel you buy at the airport high comp race use ok?

easy with the caps bud...hard to read
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  #6  
Old 10-20-2004, 09:47 PM
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Default Can any one tell me about the fuel you buy at the airport high comp race use ok?

Quote:
Originally posted by: PlatinumDogg
easy with the caps bud...hard to read
Where did you come from??

Airport fuel doo contain engine cleaning additives.. but next to nothing it will do very little harm to your engine. Mix it with regular to drop the octane just a little and you will run great!!!!!!
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  #7  
Old 10-21-2004, 04:06 AM
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Default Can any one tell me about the fuel you buy at the airport high comp race use ok?

Brace yourself, this is a long reply...

There are several grades of aviation gasoline (avgas) that must be identified before going any farther with this topic.

1. Avgas 80/87: this product is used in low compression ratio aircraft engines, contains little or no lead, is red in color, and should not be used in any engine due to a low motor octane number of about 80. I doubt any of you use this as must av gas sold is around 100 octane and leaded.

2. Avgas 100/130: this product can be used in some 2 and 4-stroke engines. It has both research and motor octane numbers slightly over 100. Avgas 100/130 is green in color, contains four grams of lead per gallon, and is becoming harder to find. Again, i doubt any of you guys actuall use this. Its just for comparison's sake.

3.Avgas 100 LL: the LL stands for "low-lead" which means two grams per gallon, low compared to the avgas 100/130 that it was designed to replace. It has research and motor octane numbers very similar to the 100/130 product previously discussed. The color is blue. This product sometimes has a high level of aromatics which can contribute to lazy throttle response and dissatisfaction of the consumer.

4.Avgas II 5/145: this product was developed for high performance piston aircraft engines used in the Korean war primarily. It is very hard to find anymore due to lack of demand although it is of very high octane quality. The color is purple.

The remainder of this discussion will assume that our basis for comparison with racing gasoline is avgas 100/130 and/or 100 LL since they are both available and have acceptable octane quality for limited applications. When the word "avgas" is used, i will be refering to avgas 100/130 or 100 LL.

Avgas is less dense than most racing gasoline. Instead of weighing about 6.1 to 6.3 pounds per gallon like racing gasoline, it weighs 5.8 to 5.9 pounds per gallon. The racer must compensate for this by changing to richer (larger) jets in the carburetor when changing from racing gasoline to avgas.

The other major difference is octane quality. Avgas is short on octane compared to most racing gasoline. Many racing engines with "quick" spark advance curves or with no centrifugal advance have more spark advance at low rpm than avgas and some racing gasoline can handle. The result is detonation, especially during mid-rpm periods because all of the spark advance is "in", rpm is low, and part throttle air fuel ratios are too lean for the operating conditions. If the rider does not "work" the throttle back and forth, pistons can be "burned" which melts away part of the aluminum piston material. Inadequate octane quality is one of the quickest ways to destroy an engine. Pistons can be severely damaged during one acceleration where detonation is present and the racer may not know what is happening until it is too late.

For maximum performance and power from a racing engine, racing gasoline will normally provide better performance then avgas. Avgas can be a good gasoline for some applications, but since most racers do not know the octane requirement of their engines, they would be better off with a "real" racing gasoline that will give them the overall resistance to detonation that they need to protect their investment. If someone has spent from $2,000 to $10,000 or more on their racing engine, it is foolish to cut corners on gasoline be sure you have a gasoline with adequate octane quality
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  #8  
Old 10-21-2004, 05:30 AM
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Default Can any one tell me about the fuel you buy at the airport high comp race use ok?

I went today to get some A/V gas from a local air field. Its only 100 octane, and it runs better with it.
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  #9  
Old 10-21-2004, 06:05 AM
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Default Can any one tell me about the fuel you buy at the airport high comp race use ok?

thanks beech, knew there was something dif just wasnt sure what it was.
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  #10  
Old 10-21-2004, 08:51 AM
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Default Can any one tell me about the fuel you buy at the airport high comp race use ok?

Beech, My blasty is set up for about 155-160 lbs of compression. I run it at 92 octane and works fine. Would I be safe to use AV gas? The place where I can get it is 100 octane.
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Old 10-21-2004, 08:51 AM
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airport, airports, av, avgas, buchanan, buy, buying, field, fuel, gas, high, octane, race, racing, reading



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