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Which grade of gas?

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Goosecreak

04-27-2001 06:40:18




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Which grade of gas should you use in H, M & SMTA tractors. We have been using midgrade. Can I use regular? Thank for your response.




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Jim (MI)

04-27-2001 10:11:50




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 Re: Which grade of gas? in reply to Goosecreak, 04-27-2001 06:40:18  
When they were made remember alot were made to run on alternatives like propane, and distillate. Not exactly prime fuels. Higher octane is made for high revving motors. Same as a car that if you have a low rpm motor all you do by adding higher octane fuels is waste money, and run hotter.



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the tractor vet

04-27-2001 18:42:40




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 Re: Re: Which grade of gas? in reply to Jim (MI), 04-27-2001 10:11:50  
That statement is not true , been through this before acording to the lab the 87 octain burns hotter then 93 octain , 93 burns slower and longer . All of use around here that run gas tractors have been there and done that , we have less problems with the plugs and cooler running temp. and use less fuel . A 706 farmll gas should run 93 octain min. My S/MTA runs alot better on 93 octain , put 87 in it and you foul plugs in short order.

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sammy the RED

04-27-2001 22:57:51




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 Re: Re: Re: Which grade of gas? in reply to the tractor vet, 04-27-2001 18:42:40  
I burn 87 octane and use D-15-Y plugs in my Super M-TA. The last set of plugs have lasted 4 years so far. Works about a 120 acres a year.



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dick

04-27-2001 20:21:40




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 Re: Re: Re: Which grade of gas? in reply to the tractor vet, 04-27-2001 18:42:40  
Guess I'm still trying to figure out how cooler-burning gas fouls plugs less than hotter burning gas.

Guess I could believe that higher octane gas might foul plugs less if it burned hotter than the lower octane gas.

In any case, it appears as though the practical solution for most everybody is to buy a hotter spark plug (cheap) instead of investing in high-octane gas (expensive). Is there some other reason than preventing fouling that you are advocating use of high-octane gasoline???

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Bob M

04-27-2001 20:41:38




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 Re: Re: Re: Re: Which grade of gas? in reply to dick, 04-27-2001 20:21:40  
Dick - I agree. Higher octane gas does not burn any cooler than low octane. The only difference is high octane is less susceptible to detonation (explosively rapid combustion early in the compustion process) than lower octane stuff. Further, fouling plugs is exacerbated by lower combustion temperatures. Therefore if high octane really did burn cooler, it would make premium gas MORE prone to foul plugs, not less.

Your solution to switch to higher temperature range plugs if fouling is a problem is the cost effective solution. Spend $5 once time for plugs makes a lot more sense than spending an extra $4 on every 20 gallon tank of fuel (though the oil companies will probably not agree!). I burn the cheapest stuff I can get in my SH and SM - probably 300 gallons combined every year. Haven't fouled a plug yet.

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the tractor vet

04-28-2001 20:31:05




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 Re: Re: Re: Re: Re: Which grade of gas? in reply to Bob M, 04-27-2001 20:41:38  
I just know what i have been told buy and independent lab in Columbus Ohio after we had some sever problems with several tractors , one sezed and engine after 30 hours of run time after and overhaul after pulling it down and looking at the damage the temp in the combustion chamber went off the scale and the pistons sweled over .025 and sezed above the top ring. I have worked on engines of all types and in all applacatoins from the mom and pa grosery getters , drag cars truck diesel , tractors ,construction equipment . and been through many schools and i know what is see and the problems we were haveing was fuel related we sent sampels to a lab for testing and i am going with there report . the gas of today is a whole bunch differnt then back a few years ago . the high test in my owen MTA makes about 4 hp more then the 89 octaine. A customer of mine that has a460 gas can't keep it from trying to seze on 87 when working hard but with the 93 it runs fine. Now if anybody has a better idea then i am all ears.

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Bob M

04-27-2001 07:04:41




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 Re: Which grade of gas? in reply to Goosecreak, 04-27-2001 06:40:18  
Use the cheapest regular gas you can find! These are low-compression engines - they're designed for, and will run fine on low octane gas. The only thing burning mid-grade/high test does is improve the oil company's cash flow...



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sammy the RED

04-27-2001 09:58:56




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 Re: Re: Which grade of gas? in reply to Bob M, 04-27-2001 07:04:41  
I agree.



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