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Posts: 242
Location: Madison | One of our local gas stations carries 110 octane. Is that safe to use in a two stroke outboard and would there be any benefits?
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Posts: 3469
Location: Elk River, Minnesota | Hiya,
It would not hurt the engine that I would know of, but you'd be paying a bunch of money for something that is only going to be more stable burning. Unless you have done extensive work on shaving the heads to increase compression significantly, the 110 octane is wasted cash. Higher octane is used in racing engines because the engines themselves have been "hopped up" so to speak...
Even with the mods that yamaha has for it's older 2 stroke engines, the most you would ever had to run is 91 octane...
Steve
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Posts: 307
| Wouldn't hurt the engine at all. But like above you're not going to gain anything and may actually not make as much power since it is a cooler burning fuel that you won't be taking advantage of, unless your motor is heavily modded. |
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| Is it ethanol-free? That might be a benefit. Otherwise, as has been said, it's wasting money. |
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Location: Contrarian Island | waste of money... I don't even think ethanol free is worth it if you use your motor often and run some sea foam or stabil now and again... |
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Posts: 1169
Location: New Hope MN | Octane rating/number is simply the resistance to detonating due to compression. Race engines require this because they typically run higher compression upwards of 13:1. If they ran "pump" gas the engine would predetonate.
Therefore, you should always run engines with the proper octane level they were designed to run off of if you want proper performance. Running higher octane fuels in factory motors can cause fuel to not fully combust and escape out the exhaust. This pollutes our lakes. Furthermore, many high octane fuels contain lead to help lubricate and cool high performance engines. This is not the kind of thing we want in our lakes either... So please don't use it.
Edited by dtaijo174 9/26/2016 2:46 PM
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Posts: 59
Location: Fifield | 2 strokes and 4 strokes are different beasts. I have run race fuel in snowmobiles and chainsaws that were not modified and have noticed BIG power gains. |
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Posts: 1209
| I put 92 in my 250 pro xs and instantly seems to have a bit less roar! Runs smooth and probably cooler but 2 mph top end loss I will return to 87 next time. |
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Posts: 3469
Location: Elk River, Minnesota | Those power gains you might be seeing are more likely due to the lack of ethanol in the fuel. Ethanol or alcohol based fuels do not have the same BTU output as non blended fuels. As such, unblended fuels will produce more power... the higher octane...they burn cooler and burn at a much more even rate. You can hear it in the engine.
But.. I would bet on a side by side hp comparison on a synonym , any gains you might see on a chainsaw or sled would be minimal... unless of course you are modifying in some way... my gut would say hotter plugs might help with that to get better ignition...
Steve. |
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| Fishysam - 9/29/2016 10:27 PM
I put 92 in my 250 pro xs and instantly seems to have a bit less roar! Runs smooth and probably cooler but 2 mph top end loss I will return to 87 next time.
Octane reduces fuels flashpoint. The biggest problem with high octane fuel in engines not designed for it, is incomplete combustion which causes carbon. Not good. |
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Posts: 1209
| I'm agreeing^^^ hence no idling around. The other fuels I had at my disposal were 10% so I avoided it. I am aware 10% will be fine especially with merc additives. |
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