Jump to content

Nominations for Tractor of the Month
Garden Tractors and Parts on eBay



Photo
- - - - -

High octane gas in small engines


  • Please log in to reply
16 replies to this topic

#1 jggardner83 OFFLINE  

jggardner83

    New Member

  • New Member
  • Member No: 3422
  • 0 Thanks
  • 3 posts

Posted May 17, 2011 - 12:27 PM

Are there any limitations or guidlines for using 93 octane gas in tractors?

#2 NUTNDUN OFFLINE  

NUTNDUN

    Lost in Cyber Space

  • Admin
  • Staff
  • -GTt Supporter-
  • Contributor
  • Member No: 3
  • 10,266 Thanks
  • 15,618 posts
  • Location: Pennsylvania

Posted May 17, 2011 - 12:49 PM

It won't hurt but it isn't really needed. You are better off running ethanol free gas. With that being said we have been getting 93 octane ethanol free for a while but with the way gas prices are going we are just going to start running 87 octane with 10% ethanol and just be more maintenance oriented and make sure we drain the tanks and bowls when we know the stuff will sit for a while.

#3 ducky ONLINE  

ducky

    Senior Member

  • Senior Member
  • -GTt Supporter-
  • Contributor
  • Member No: 564
  • 1,632 Thanks
  • 3,870 posts
  • Location: Freedom, WI

Posted May 17, 2011 - 02:07 PM

It won't hurt but it isn't really needed. You are better off running ethanol free gas. With that being said we have been getting 93 octane ethanol free for a while but with the way gas prices are going we are just going to start running 87 octane with 10% ethanol and just be more maintenance oriented and make sure we drain the tanks and bowls when we know the stuff will sit for a while.

DITTO
A friend of mine uses aviation fuel I think 108 and never has a carb problem. Of coarse no alcohol or water is in that stuff.

#4 1978murray OFFLINE  

1978murray

    diesel mechanic

  • Senior Member
  • Member No: 2523
  • 598 Thanks
  • 1,163 posts
  • Location: harrison city, PA

Posted May 17, 2011 - 03:04 PM

The high octane gas does not burn properly in a small engine because of the lower compression ratio. Runing 93 octane will cause the fuel to not burn all the way and will cause the motor to loose power,

#5 Billygoat OFFLINE  

Billygoat

    Tractorholic

  • Senior Member
  • Member No: 2454
  • 76 Thanks
  • 206 posts

Posted May 17, 2011 - 06:15 PM

Higher octane gas just burns slower than the lower octane stuff. If you are not having any spark knock with 87, there's no advantage to running higher octane. As1978murray said it can lead to less power, and probably higher fuel consumption.

#6 RustyTub OFFLINE  

RustyTub

    Tractorholic

  • Senior Member
  • Member No: 2702
  • 25 Thanks
  • 137 posts
  • Location: Southern Oregon

Posted May 17, 2011 - 07:11 PM

I just run Ethenol Free 91 octane we get around here. The ethenol has been nothing but issue to all of my small engines. I even drain the tanks and run the carbs dry and still have issues.

#7 WQDL753 OFFLINE  

WQDL753

    Bolensholic

  • Senior Member
  • Contributor
  • Member No: 1407
  • 59 Thanks
  • 301 posts
  • Location: Beaver, PA

Posted May 21, 2011 - 09:33 PM

All I know, is my Huskivarna manuals say high octane or they will overheat, and I've always tried to run at least mid grade in an air cooled engine.
They seem yo be happier and give fewer problems when I do.

#8 ducky ONLINE  

ducky

    Senior Member

  • Senior Member
  • -GTt Supporter-
  • Contributor
  • Member No: 564
  • 1,632 Thanks
  • 3,870 posts
  • Location: Freedom, WI

Posted May 21, 2011 - 09:48 PM

Higher octane gas just burns slower than the lower octane stuff. If you are not having any spark knock with 87, there's no advantage to running higher octane. As1978murray said it can lead to less power, and probably higher fuel consumption.

I think what we are trying to say here is that we need to avoid the alcohol to prevent this corrosion issues we see with the blended fuels of today. I do not even think the new "box store" tractors will do well on the blended fuel. Think about it. How much maintenance do guys do that buy" box store" tractors do? Lucky if they can change their own oil.

#9 Billygoat OFFLINE  

Billygoat

    Tractorholic

  • Senior Member
  • Member No: 2454
  • 76 Thanks
  • 206 posts

Posted May 22, 2011 - 05:20 AM

I really haven't seen any more problems with blended fuel than I did with unblended. The guidelines I see people post for "extra" attention needed when running E-10 is pretty much the same as manufacturer's instructions back when running unblended. I do get worse gas mileage with my Dodge Ram with a 5.9 though. Keep fresh fuel in your equipment and it should be fine. If you are storing for a while, drain the fuel and put it in your car/truck. No, it doesn't hurt anything to put the mixed up 2-stroke fuel in your vehicle. By the time it's mixed with 1/2 to full tank in vehicles, it's diluted plenty.

#10 josh deaven OFFLINE  

josh deaven

    Tractorholic

  • Senior Member
  • Contributor
  • Member No: 535
  • 477 Thanks
  • 574 posts
  • Location: pa

Posted May 22, 2011 - 05:32 PM

Hey Guys I have used racing gas mixed with regular gas. The racing fuel with lead in it keeps the gas stable longer. Do not run a full tank of racing fuel it could cause engine issue.I also found a new fuel addtive called Ethanol Shield it is good up e15 gas.I am working on article for lagc on this product. stay tuned for that. If you want more info go
www.ethanolshield.com

#11 Texas Deere and Horse OFFLINE  

Texas Deere and Horse

    RED Wild Hogs, Horses & Deeres

  • Staff Admin
  • Staff
  • -GTt Supporter-
  • Contributor
  • Member No: 1435
  • 14,464 Thanks
  • 15,392 posts
  • Location: East of San Antonio Texas

Posted May 22, 2011 - 05:49 PM

Josh, Thats a good idea. I have a neighbor that races,I will check with him on where he gets his racing gas at.

#12 wilberj ONLINE  

wilberj
  • Senior Member
  • -GTt Supporter-
  • Contributor
  • Member No: 51
  • 4,214 Thanks
  • 5,218 posts
  • Location: Michigan

Posted May 22, 2011 - 07:59 PM

Josh, Thats a good idea. I have a neighbor that races,I will check with him on where he gets his racing gas at.


Most Gas places within a area were a race track is will have Raceing gas.
What do you need to run high octane any ways? Reg is just fine

#13 josh deaven OFFLINE  

josh deaven

    Tractorholic

  • Senior Member
  • Contributor
  • Member No: 535
  • 477 Thanks
  • 574 posts
  • Location: pa

Posted May 22, 2011 - 08:22 PM

It is not about the octane it is the lead in the fuel.

#14 wilberj ONLINE  

wilberj
  • Senior Member
  • -GTt Supporter-
  • Contributor
  • Member No: 51
  • 4,214 Thanks
  • 5,218 posts
  • Location: Michigan

Posted May 22, 2011 - 08:40 PM

It is not about the octane it is the lead in the fuel.


Last time I know there is no lead in fuel any more.

#15 Bolens 1000 OFFLINE  

Bolens 1000

    DR. Bolens

  • Staff Admin
  • Staff
  • -GTt Supporter-
  • Contributor
  • Member No: 7
  • 12,703 Thanks
  • 17,209 posts
  • Location: Western NY

Posted May 22, 2011 - 08:45 PM

Last time I know there is no lead in fuel any more.


:ditto:

I do mix lead additive in all my equipment though




Top