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Can High Octane Gas help an engine run cooler?


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#1 OFFLINE   312Hydro

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Posted 07 August 2012 - 11:25 PM

I had this mentioned to me the other day and was wondering if there is any truth to it. :eusa-think:

Rich
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1995 520H

                  "I don't often rebuild garden tractors, But when I do, I rebuild :wh: 's. The most interesting GT in the world! Stay RED my friend!"


#2 ONLINE   MalMac

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Posted 08 August 2012 - 04:54 AM

I don't know myself but it is an interesting question. i recently switched over to the high Octane because the lower octane gas we have been getting around here is and has been just plain junk. All of my tractors have been having trouble with real quick gum up and just not running worth a darn. I did notice a rather big change in the way things ran after switching. I notice this especially on the tractors with the Onans. Besides the Onans running better they seem to be using just alittle less gas. Not a huge savings just a noticeable difference.

#3 ONLINE   VinsRJ

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Posted 08 August 2012 - 06:29 AM

I don't know for sertain if they run cooler or hotter but higher octane fuel is typically more stable than lower octane, therefore it prevents detonation a little better.

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#4 OFFLINE   JackC

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Posted 08 August 2012 - 07:43 AM

Don't know about running cooler and by how much.
I do know that the ethanol causes problems and cleaning carburetors is getting to be a pain.
I switched to no ethanol fuel still available in NY state.

States should pass laws allowing it to be sold for off road use (check for availability in your state).

#5 OFFLINE   Duff

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Posted 09 August 2012 - 03:26 PM

I wonder if the shortage of corn created by the nationwide drought will have some [positive for us] impact on the ethanol situation?

Duff :thumbs:
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#6 OFFLINE   smoreau

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Posted 09 August 2012 - 08:46 PM

I wonder if the shortage of corn created by the nationwide drought will have some [positive for us] impact on the ethanol situation?

Duff :thumbs:


If this could only be true! My guess is they will probably import it like every thing else :handgestures-thumbdown: government has gotten out of our control!

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#7 OFFLINE   Hydro

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Posted 09 August 2012 - 09:17 PM

Higher octane means lower ignition temperature. Up here any good small engine mechanic recommends nothing but high octane for small engines mainly because they have not found a way to put ethanol in it. Engines with high test can sit for awhile without use but regular with ethanol is a real problem with engines used infrequently.

Gary

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#8 OFFLINE   JackC

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Posted 09 August 2012 - 09:59 PM

Your engine could run on the ethanol and water that drops to the bottom of your tank which is where the engine draws from.
Bad stuff.
Even worse for 2 cycle engines.

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Buy pure gas if you can find it.

http://pure-gas.org/

#9 OFFLINE   zieg72

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Posted 10 August 2012 - 03:44 PM

For me and my Onans I found a 50/50 blend of Premium/regular got me the best overall yield. Around me it is $.10 per gallon difference between Regular, Mid-Grade and premium. I found no difference between the blend I use and all premium, but I also use it up in a couple of weeks of getting it so I haven't compared shelf life either.

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#10 OFFLINE   tunahead72

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Posted 10 August 2012 - 08:03 PM

...Up here any good small engine mechanic recommends nothing but high octane for small engines mainly because they have not found a way to put ethanol in it...


Am I reading this right?

I haven't checked my local gas pumps carefully lately, but you're saying no high octane gas contains ethanol? Maybe just in Canada? :dunno:
Ed
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#11 OFFLINE   Lars

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Posted 10 August 2012 - 08:18 PM

yes it will runs cooler on high (er) octane. and the sparkplug goes cooler the best fuel is whit lead that u cant get anymore. lead cooled down the engine..
here in norway we have 95,98 and 99 octane gas at the pump.. i have tried to use 99 somtimes on my horses and its a big diffrent from regular 95 gas runs way better on 99 octane.. more power etc..

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#12 OFFLINE   312Hydro

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Posted 10 August 2012 - 08:43 PM

Thanks guys for all the input. Some very good points were brought up about the ethanol. My son has been using a regular blend with ethanol add and he had a problem with the Jeep stalling about a minute after startup. After he switched gas it quit in about a week. Exactly what JackC described.Coincidence? Maybe. I was just wondering if this would help the Onans with the back cylinder overheating on the 520h.. I'm going to try the higher octane like Knusem mentioned.

Rich
1991 312H
1995 520H

                  "I don't often rebuild garden tractors, But when I do, I rebuild :wh: 's. The most interesting GT in the world! Stay RED my friend!"


#13 OFFLINE   ericj

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Posted 11 August 2012 - 01:15 PM

knock on wood, i've always used high test 92 or 93 octane fuel with stabil added when i fill my cans and i have not had any significant problems with any of my tractors or my pick up that sits a lot i wish i could still find snocco ultra 94, that ran real good and could sit for well over a year with out a problem. i have had almost no problems with carbs on my tractors even the ones that sit for months at a time, using 93 octane and stabil

eric j

#14 OFFLINE   rick

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Posted 11 August 2012 - 05:00 PM

I have found that AVGAS, 100 octane low lead, wakes 'em up and smells good, too. I haven't seen any negative effects, from the Onan in my 416H to the trimmers and other two stroke stuff I use and service.

#15 OFFLINE   Hydro

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Posted 11 August 2012 - 08:25 PM

@ tunahead72

In Ontario there is no ethanol in Hi Octane gasoline and that's a fact.

Gary

'97 516C (Custom)16 & Single...Kohler Power.
'88 416-8
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