Unleaded Fuel

   / Unleaded Fuel #1  

angusman

New member
Joined
Aug 18, 2010
Messages
9
Tractor
Kubota M8200
I have a Super H and was wondering what unleaded fuel will do to it...should I put lead substitute in it? Thanks in advance.
 
   / Unleaded Fuel #3  
did it have hardened valve seats from the factory?

octane in todays gas is way higher than in the 40's and 50's.. TEL was an octane enhancer ( so is ethanol.. go figure! ).. for a low rpm, low compression machine with hard exhaust valve seats you don't need to do anything.

soundguy
 
   / Unleaded Fuel #4  
I have a Super H and was wondering what unleaded fuel will do to it...should I put lead substitute in it? Thanks in advance.

I'm restoring a 1951 Minneapolis Moline BF that has a 27 hp 4-cyl Hercules gas engine. The engine was completely torn down and rebuilt, including hardened valve seats to handle today's unleaded gas. Not a big cost impact and gives me peace of mind.
 
   / Unleaded Fuel #5  
I've used it in my similar vintage IH's with no problems. Although I do try to use gas with no ethanol.
 
   / Unleaded Fuel #6  
virtually impossible to get non ethanol gas around here except at a marina or airport.. and all the airport gas is high octane. at the marina you have to have a membership to purchase there PLUS it's a 45m one way drive...... :(

soundguy
 
   / Unleaded Fuel #7  
We're pretty fortunate here, for the time being.. You can still buy 100% gasoline at the major oil companies pumps. Even a few major chain store gas pumps. They have stickers on the pumps..., 100% gasoline.

Speedway, Thornton, etc. have ethanol...

When recently hauling many, many loads of fill material for a new horsebarn and shop, I did a comparison of the fuels. I did get better mileage with 100% gas, and seemed to have a little more power pulling the same grade...

Another story for the "projects" thread some day...
 
   / Unleaded Fuel #8  
10% ethanol at every pumpi can find...

sounguy
 
   / Unleaded Fuel #9  
Lead substitute is not worth the bottle it is sold in. I used it religiously with my low-hour 8n when I bought it from an old widow 20 years ago and still only got a couple months out of the factory (1200 hr), non-hardened valve seats useing unleaded gas. I replaced them with hardened seats and the tractor has been great ever since. For at least half that time it was my primary tractor and got some hard use. Now it is mostly relegated to light-duty but will still pull like new if I ever need it to. As others mentioned, you will be ok with the original seats if you dont work the tractor very hard. If you do work it hard, lead substitute will do nothing to increase the life of original, non-hardened valve seats. I would just run them until they go, then replace with hardened seats. If you are talking about parade-duty or have way more than 1 hp per acre like SG does, then those original seats will last forever.
 
   / Unleaded Fuel #10  
ALL 8n left the factory with hardened intake and exhaust seats.

wartime 2n left with hardened exhaust only.

if you had non hardened seats.. someones been in there before you got it, and after it left the factory.

soundguy
 

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