what octane/run any additives? - Page 3 - Polaris RZR Forum - RZR Forums.net
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View Poll Results: what grade fuel do u run
87 386 38.37%
89 77 7.65%
91 329 32.70%
93 214 21.27%
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post #31 of 244 Old March 19th, 2011, 05:17 PM
 
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Re: what octane/run any additives?

I run Premium Unleaded (91 Octane here in Utah) in all my OHVs...nothing else.

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post #32 of 244 Old March 19th, 2011, 07:30 PM
 
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Re: what octane/run any additives?

F&L 110

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post #33 of 244 Old March 20th, 2011, 07:10 PM
 
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Re: what octane/run any additives?

87 with no ethanol. Without any ethanol we don't need to add anything when it sits for a month or so since it doesn't absorb water. But it's rare for it to sit for more than a month!
Once we had to put ethanol gas in it so we dumped in 1/4-1/2 can of seafoam. Started it up a month later and it still worked fine.
We've seen people who put ethanol gas into their quads, then let them sit for a month or so..next time out it wouldn't run right so they had to dump out the tank and refill it with new gas.
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post #34 of 244 Old March 22nd, 2011, 12:42 PM
 
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Re: what octane/run any additives?

octane rating would depend on your elevation. at sea level in a stock rzr, 87 is all it needs as long as you dont have any pre-ignition. 93 is not "better", it just needs a higher temp to combust. if you sit on top of the rocky mountains, you can probably do 85 or so...whatever they have there now.

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post #35 of 244 Old March 22nd, 2011, 12:55 PM
 
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Re: what octane/run any additives?

I use 87 in my Toybox tank with Sta-Bil. Every other tank in the Rzr I add a little Marvel Mystery Oil. Works great for me. (Use a little Marvel in my Stinson also!)
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post #36 of 244 Old March 22nd, 2011, 03:35 PM
 
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Re: what octane/run any additives?

Quote:
Originally Posted by Orca View Post
I use 91 pump gas in both of my sidexsides and the main reason is that the higher octane fuel burns cooler and helps keep engine temps down. Since puting the turbo on the "S" I mix 50/50 110 VP with 91 pump.
Quote:
Originally Posted by ADKrzrlvr View Post
run 87, my friend used to run 93 in his honda atv and kept overheating halfway through our trips...he tried some crap you put in your antifreeze called ice and it didnt help...I told him to run 87 because the lower octane helps keep the engine cooler...long story short he changed to 87 and never had an overheat issue again...
These two views are completely opposite. I guess I'll have to do some outside research on this. Just interested to know.
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post #37 of 244 Old March 22nd, 2011, 03:37 PM
 
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Re: what octane/run any additives?

Quote:
Originally Posted by rayb View Post
I use 87 in my Toybox tank with Sta-Bil. Every other tank in the Rzr I add a little Marvel Mystery Oil. Works great for me. (Use a little Marvel in my Stinson also!)
My father used to run MMO in everything. Never really knew why What are you thinking are the benefits in a 4-stroke with FI?
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post #38 of 244 Old March 22nd, 2011, 03:44 PM
 
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Re: what octane/run any additives?

Quote:
Originally Posted by FunRide View Post
Quote:
Originally Posted by rayb View Post
I use 87 in my Toybox tank with Sta-Bil. Every other tank in the Rzr I add a little Marvel Mystery Oil. Works great for me. (Use a little Marvel in my Stinson also!)
My father used to run MMO in everything. Never really knew why What are you thinking are the benefits in a 4-stroke with FI?

Upper end lubrication, maintainance of seals etc. Like your dad, my dad used it in everthing too and it hasn't hurt anything yet... maybe just mental peace of mind!
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post #39 of 244 Old March 22nd, 2011, 04:07 PM
 
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Re: what octane/run any additives?

The owners manual says to use no less than 87 octane fuel. I'm sure the R&D guys who made the motor know a hell of a lot more about what fuel to run. If the motor is making enough compression to run 87 than anything more is just wasting your money. I had a Hemicuda with 11.5:1 compression that would not run without mixing racefuel. Usually I'd mix 93-4 with 110 racefuel and it made all kinds of power. Anything less and I got detonation AND the engine temp went up. I tried 120 racefuel one time and didn't notice a bit of difference. The new gas is junk and has a short shelf life so a capful of Seafoam, Startron, or MM may be a good idea. IMHO.
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post #40 of 244 Old March 22nd, 2011, 04:36 PM
 
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Re: what octane/run any additives?

Quote:
Originally Posted by FunRide View Post
Quote:
Originally Posted by Orca View Post
I use 91 pump gas in both of my sidexsides and the main reason is that the higher octane fuel burns cooler and helps keep engine temps down. Since putting the turbo on the "S" I mix 50/50 110 VP with 91 pump.
Quote:
Originally Posted by ADKrzrlvr View Post
run 87, my friend used to run 93 in his honda atv and kept overheating halfway through our trips...he tried some crap you put in your antifreeze called ice and it didnt help...I told him to run 87 because the lower octane helps keep the engine cooler...long story short he changed to 87 and never had an overheat issue again...
These two views are completely opposite. I guess I'll have to do some outside research on this. Just interested to know.
People with turbos and high boost often use richer mixtures and higher octane to cool things.
Wasteful, but it allows higher pressure and more power.

A lean mixture therefore runs hotter in comparison, in hard use or forced induction.
Higher octane fuels as a rule burn slower/longer, and these are nano seconds, which in turn lower octane burns (explodes) all at once, generating more heat per explosion.

"enjoy your ride"

Dennis AKA "air Walter"
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post #41 of 244 Old March 22nd, 2011, 05:19 PM
 
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Re: what octane/run any additives?

Quote:
Originally Posted by Orca View Post
Quote:
Originally Posted by FunRide View Post
Quote:
Originally Posted by Orca View Post
I use 91 pump gas in both of my sidexsides and the main reason is that the higher octane fuel burns cooler and helps keep engine temps down. Since putting the turbo on the "S" I mix 50/50 110 VP with 91 pump.
Quote:
Originally Posted by ADKrzrlvr View Post
run 87, my friend used to run 93 in his honda atv and kept overheating halfway through our trips...he tried some crap you put in your antifreeze called ice and it didnt help...I told him to run 87 because the lower octane helps keep the engine cooler...long story short he changed to 87 and never had an overheat issue again...
These two views are completely opposite. I guess I'll have to do some outside research on this. Just interested to know.
People with turbos and high boost often use richer mixtures and higher octane to cool things.
Wasteful, but it allows higher pressure and more power.

A lean mixture therefore runs hotter in comparison, in hard use or forced induction.
Higher octane fuels as a rule burn slower/longer, and these are nano seconds, which in turn lower octane burns (explodes) all at once, generating more heat per explosion.
Wonder why ADK's buddy was running so hot on the cooler, slower burning, higher octane fuel. Appears to be directly related to octane rating, but maybe some other factors involved.
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post #42 of 244 Old March 22nd, 2011, 05:47 PM
 
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Re: what octane/run any additives?

Quote:
Originally Posted by FunRide View Post
Quote:
Originally Posted by Orca View Post
Quote:
Originally Posted by FunRide View Post



These two views are completely opposite. I guess I'll have to do some outside research on this. Just interested to know.
People with turbos and high boost often use richer mixtures and higher octane to cool things.
Wasteful, but it allows higher pressure and more power.

A lean mixture therefore runs hotter in comparison, in hard use or forced induction.
Higher octane fuels as a rule burn slower/longer, and these are nano seconds, which in turn lower octane burns (explodes) all at once, generating more heat per explosion.
Wonder why ADK's buddy was running so hot on the cooler, slower burning, higher octane fuel. Appears to be directly related to octane rating, but maybe some other factors involved.
He had a first year honda rincon and after putting on a bb kit he had overheating issues till he went to a lower octane and the overheat light never came on again. He hated putting 87 in it because he likes to use the highest octane he can find for all his machines, I go by the manual because that octane is what the motor is set up for and if I dont change anything motorwise then I feel its just a waste...prices are high enough.
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post #43 of 244 Old March 22nd, 2011, 06:11 PM
 
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Re: what octane/run any additives?

Fun Ride Quote
Wonder why ADK's buddy was running so hot on the cooler, slower burning, higher octane fuel. Appears to be directly related to octane rating, but maybe some other factors involved.

With out knowing more on ADK's buddy's ride I can only guess.... Oxygenated fuel can cause bike/etc to run leaner = hotter. Cleaner air filter when running hi octane = run leaner = hotter. Is it a carburetor fueled quad? Maybe bad gas? Air cooled verse water cooled. Did he ride the quad harder than usual when using higher octane,(thinking he had more power = more heat/ temp increase... the list can go on and on with out having more facts.
Rule of thumb, higher octane will not provide more power if the unit in question was designed for the lower octane. But as an engine heats up it is suppose to get richer, when it's cold it is lean, that's why you choke it.

"enjoy your ride"

Dennis AKA "air Walter"
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post #44 of 244 Old March 22nd, 2011, 07:55 PM
 
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Re: what octane/run any additives?

Quote:
Originally Posted by Orca View Post
But as an engine heats up it is suppose to get richer, when it's cold it is lean, that's why you choke it.
Unless it's fuel injected, then you're not chokin' anything but yur chicken

Thanks, yeah not worth speculating why. Sounds like he made a bunch of mods from factory Honda setup.
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post #45 of 244 Old March 22nd, 2011, 08:13 PM
 
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Re: what octane/run any additives?

its all about compression boys. octane rating is a knock index. aka its resistance to knock. higher octane rating means it can withstand higher compression before it combusts due to compression which is what you hear as a ping or a knock. if your motor isnt knocking or pinging on 87, then stick with 87. you wont gain anything but a higher fuel bill otherwise. heat also contributes to pre ignition from compression. if anyone has or ever had a 90s model dodge truck with a magnum v8 engine, they know what that sounds like. when loading the engine they ping like crazy because when you load the engine you're dumping more air and fuel in. that combined with heat causes a lot of noise. if you replaced the thermostat in those trucks to a 180 from a 195 they would quit pinging. so what happens when you add a turbo? it forces more air in which means higher compression which means you need a higher octane rating. what about big bore kits? more air and fuel in the cylinders means higher compression..........isnt science fun?

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