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| Barry_M2 |
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Barry_M2
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feef
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| Barry_M2 |
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Barry_M2
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feef
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 Posted: 12:47 - 29 Sep 2006  Post subject: |
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| Barry_MC21 wrote: | Now your asking.
A friend of mine needs it for a bike he has just brought. NSR250 |
unless it's running a stupidl high compression ratio, it won't need, and will probably melt, if it's running aviation petrol.
I'll assume he'll be looking for Avgas 100/130, or 100LL
Avgas 100/130: this product that can be used in some automotive 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.
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.
Avgas is less dense than most racing fuels. Instead of weighing about 6.1 to 6.3 pounds per gallon like racing fuel, it weighs 5.8 to 5.9 pounds per gallon. Need to compensate for this by changing to richer (larger) jets in the carburetor when changing running with avgas.
The other major difference is octane quality. Avgas is short on octane compared to most racing fuels. 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 fuels can handle. The result is detonation, especially during low speed/low RPM running 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 you don't "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 you might not know what is happening until it is too late.
For maximum performance and power from a racing engine, racing fuel will normally provide better performance than avgas. Avgas can be a good fuel for some applications, but since most people do not know the octane requirement of their engines, they would be better off with a "real" racing fuel that will give them the overall resistance to detonation that they need to protect their investment. If someone has spent thousnds or more on their racing engine, it is foolish to cut corners on fuel.
Avgas is designed for high performance reciprocating aviation piston engines, and is also very volatile. Even a sealed container has a shelf life of 6 months. You might get away with a 50/50 avgas/petrol mix, but even then, unless the engine has been seriously tuned, It'll prolly just melt the pistons.
a
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| Barry_M2 |
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Barry_M2
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| Posted: 13:05 - 29 Sep 2006 Post subject: |
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It does need avgas, its a race bike and it is running very high compression. Hence my question, where can you get it from. I wouldn't ask for it if it wasn't needed. 
I didn't need the lesson in fuel, I know what it does.
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| feef |
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feef
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| Posted: 13:15 - 29 Sep 2006 Post subject: |
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..then you're in the minority 
the number of people I know of, who have bought a bike, whacked a K&N in, a race exhasut and then run it on avgas or equivalent, only to have it melt under them...
well..
no harm in making sure, and maybe someome else will find my post useful,
I'd try your local air-strip
look for smaller ones, where piston aircraft will be the norm.. you don't want jet fuel as that's basically paraffin 
a
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Barry_M2
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| divuk83 |
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divuk83
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| Posted: 12:57 - 05 Oct 2006 Post subject: |
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https://www.aaoil.co.uk/
Not Avgas, but they sell very high octane race fuels.
Dave |
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Old Thread Alert!
The last post was made 19 years, 274 days ago. Instead of replying here, would creating a new thread be more useful? |
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