87 or 91 octane fuel for modded nytro?

[Bahr05]

The sled is designed for 87 octane. I believe the sled is designed for 10% ethanol tolerance as well. So there shouldnt be a performance decrease when going from premo gas to regular gas. I never noticed a difference. I just run non-ethanol cause I'm sorta old school like that.

 

[LSXM3]

Lets put this to rest again! Higher octane fuel is harder to ignite than lower octane fuel to reduce the risk of detonation, therefore it will not burn as efficiently as the fuel your vehicle is designed to run on. I can go into great depths on this as i work in the industry but run what it says unless you have changed pistons to increase compression, messed with the timing, or added boost!

On a side not my sled gets 1-2mpg less when I have to run 91 instead of 87!

 

[revster]

Yeah agreed, I see no performance difference between the grades, nor would I expect to. When I am in the middle of nowhere I sometimes have to run ethanol 87 and I don't worry about it at all. But given the choice I avoid ethanol as much as possible and in my area that means running 91. I have been to stations that don't have ethanol in any of their grades and I then run 87. It's not about performance it's about avoiding ethanol as much as possible.

 

[nor'easter]

Yeah agreed, I see no performance difference between the grades, nor would I expect to. When I am in the middle of nowhere I sometimes have to run ethanol 87 and I don't worry about it at all. But given the choice I avoid ethanol as much as possible and in my area that means running 91. I have been to stations that don't have ethanol in any of their grades and I then run 87. It's not about performance it's about avoiding ethanol as much as possible.

X2. Exactly what I believe.

 

[gc_srt]

The engine is built to run gas with ethanol so I do. And with running premium, I don't believe the Nytro can advance the timing to take atvantage of the higher octate like an automotive engine. So to use premium (and take advantage of it), you would have to increase the compression or advance the timing.

(insert clever joke about ethanol and drinks here)

 

[UP bushman]

deffenetly stay away from Junkenal (ethanol) fuel if possible for seperating issues.

 

[revster]

The engine is built to run gas with ethanol so I do. And with running premium, I don't believe the Nytro can advance the timing to take atvantage of the higher octate like an automotive engine. So to use premium (and take advantage of it), you would have to increase the compression or advance the timing.

(insert clever joke about ethanol and drinks here)

So nothing to worry about from ethanol? No problems in the tank, fuel pump ect? Ethanol is just as good for your engine as non ethanol fuel? Just want to clear up what you are stating.

 

[gc_srt]

If the motor is 'designed or tuned' to run off 87 with 10% ethanol than it won't be an issue; older sleds are jetted to non-ethanol 87 fuel, which requires less fuel, thus causing lean conditions and engine failure. Ethanol is fine to burn as long as your sled is jetting for it (which it is). Stoichiometric ratio for conventional fuel is 14.7:1 while it is 9.7:1 for E85.

Issues that you are discussing are related to ethanol absorbing condensation in the tank as opposed to non-ethanol fuel that floats on water. To answer your question, I have never had an issue with fuel pumps or ‘problems in the tank’. If you run your fuel too low, you will have more of an issue – this is why pilot check the bottom of their tanks for water build up. Unless you keep your talk completely full before putting it in the garage thus reducing the air/moisture in your tank.

I discuss using premium fuel with Allen Ulmer and he recommended against it unless you change the timing or compression. The Nytro does not change the timing of the engine (like your automobile) for different octane thus there is no benefit in running 87 versus 91 octane.

You will probably have less issues running non-ethanol fuel than me, but it comes down to convenient. I cannot get non-ethanol 87 fuel in close proximity to me, so I don’t run it.

 

[loudelectronics]

Ditto.. Ethanol will not hurt these engines. 87 with ethanol all the way. Only time ethanol is an issue is if you experience phase separation. This is very unlikely in a sled. It is more of an issue in marine environments under warmer conditions with humidity. Also it is unlikely that your sled will sit for 16 weeks in the winter on the same tank of fuel. Fuel is stabilized to last 16 weeks. After this, its your problem. Add some seafoam and stability increases to 2 years.

Don't be scared of ethanol. It is really just misinformed people spreading the word that it is bad not fully understanding the science behind it.

Kinda like how there was a petition to ban di-hydrogen monoxide and people actually took it to congress. Yup it can be really nasty stuff but boy we cant live with out it.

 

[revster]

Well by all means you guys can run whatever you want and I can run whatever I want, so we don't need to convince each other. We had a couple of horrible seasons of engine failures that resulted in a ton of reading and consulting engine builders that said "do not run ethanol fuel." So it's not an instance of being mislead or uneducated. It actually surprises me that there are guys on here that willing to run it to save a couple of bucks.

As a result of my research my bike and sled only see ethanol when I don't have a choice. (Actually my bike never sees it) We are talking about $3/fill, peanuts compared to what I have invested in the sled.

But to each their own

 

[BADSLED]

The 10% ethanol is not an issue found in fuel but I would be concerned with the moisture it absorbs from atmosphere is what may cause the failure. Try not have your fuel sit in gas tank for a long time and get it from busy gas stations before gong riding... I have yet to see a 4 stroke yamaha fail from bad fuel. It will not want to idle but to blow it up is difficult to believe..

 

[zrcrazy]

this is out of my manual.... is 10% ok???...