high octane fuel ?

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richardparker

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So I got gas the other day out of town and was so excited when I seen 100 octane getting sold at the pump of a everyday gas staion.The excitement was for my real car but,It had me also wondering if it would add more performance to a rc engine or not.
100 octane good or bad ?
 
Don't run race fuel in a car not designed for it. You can damage it. High octane fuel will work in RC engines if the engine is set up for it. Usually it requires up to 17:1 compression domes to be beneficial. Most of these small engines are designed to run on 90-93 octane for optimal performance.

Sure you can run it in lower compression engines but the there won't be a huge benefit from it.
 
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You will also heat up the exhaust gasses from unburnt fuel. I personally think you will not see the difference for the cost. A good example would be the users of Naptha or Coleman that say they see no difference from unleaded to Naptha. Naptha is 55 oct. :eek:
 
LOST IN MN said:
Don't run race fuel in a car not designed for it. You can damage it. High octane fuel will work in RC engines if the engine is set up for it. Usually it requires 17:1 compression domes to be beneficial. Most of these small engines are designed to run on 90-93 octane for optimal performance.

Sure you can run it in lower compression engines but the there won't be a huge benefit from it.
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Anything above 11:1 should be running octane higher than 94 in the U.S. Actually 110 would be perfect in an 11:1 motor.

100 would also be beneficial in an iron headed 10.5:1 C/R with a high duration cam.

17:1?? Nothing runs compression ratios that high... R/C or full scale... Alcohol motors run in the high teens, but you weren't talking about that, so I have no idea what you are talking about.. Do you?

Will anything be harmed by running 100 octane? Nope, just your wallet.

Simple science. The higher the octane, the slower the fuel burns.
 
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110 octane in an 11:1 compression 2 stroke motor is pointless the fuel doesn't compress enough to allow a full burn. High compression is needed to have a benefit from it same goes with alcohol. It's not that the fuel burns slower its that it's harder to ignite without being extremely compressed. Any engine builder will tell you the same thing.
Can you run it in lower compression motors? sure will you see a benefit? NO
Putting high octane fuel above 100 octane in a factory 1:1 street car isnt going to do anything but melt your exhaust. Hence the damage
 
I have heard of people melting abs rear bumpers on real car from exhaust being to short but, that's it.Well besides burnt valves.
I was just asking about small engines,I think responses were drifting back and forth:
real-rc. Although I don't mind,I'm a little car crazy.
 
Burnt valves don't come from octane ratings in gas. It comes from fuel/air mixtures wrong, too lean condition or timing issues among others but running a high octane gas isn't going to do it.
 
I'm not saying they won't run ok i'm saying it's a waste of money as really there isn't any benefit in these small motors unless they are set up for higher compression.
Also something else to note alot of race fuel's sold in the US contain Lead. This is extremely important if trying to put this fuel in a modern 1:1 car Leaded gas will also destroy cat coverters.
If your going to run high octane fuel make sure its unleaded!!!
VP 110 octane sells here for $10.05/gal where as premium 94 octane neat is $4.03/gal
 
The other issue with using higher octane with motors not needing it is you will loose power. You want to match your motor with the lowest OCT/RON that you can for your motor to get a complete burn of the fuel.
 
tonystott said:
Cutting through the chaff, the original poster should stick to normal petrol and save his money...
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^ weird.
Thinking of doing so p&p work to this motor.
Worth the time ?
I plenty experiance match p&p'n just not with tiny rc motors.
Plenty of pics for those who question op's ability's.
 
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