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Farmall & IHC Tractors Discussion Forum
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Farmall M High Altitude?

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Pete Zahrt

11-20-2005 14:40:31




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Hello, I am restoring a 1949 Farmall M and it had an X at the end of the serial number meaning it was a high altitude tractor. Is this true? And if in fact it is, what makes it special? Any comments would be appreciated, thanks!

pete




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CNKS

11-20-2005 17:52:24




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 Re: Farmall M High Altitude? in reply to Pete Zahrt, 11-20-2005 14:40:31  
There are many X codes, the X by itself does not mean you have 5000 or 8000 ft equipment, you need to give the entire suffix, including numbers and letters following the serial number. They don't make the tractor more valuable, unless you live at higher altitudes and are comparing it with a non-high altitude tractor. The high altitude tractor will have more power because of higher compression.



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Randy-IA

11-20-2005 15:48:53




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 Re: Farmall M High Altitude? in reply to Pete Zahrt, 11-20-2005 14:40:31  
Hi , I'm not going to say it's not true but to my limited knowledge if it also has a 1 behind it it is a gas only engine suffix ( example - 134222 X1 ) . The manual say's that a 5000' and 8000' option was available but I don't know how it was designated . The high altitude option consisted of new sleeves and piston's . I would think ( correct me if I'm wrong ) that they'd be a lower compression ratio to deal with the fact that the atmosphere is thinner at those altitudes . This would prevent preignition or " knocking " under load . I know that when I moved to Vail twenty years ago with a high performance Chevy truck I had to retard the timing a lot . This truck had 10.5 to 1 compression . I moved from St. Louis , Mo . I leaned the carb as far as I felt comfortable before I left . Might be the same for the tractor ? Just a guess really . Take care ...Randy

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Randy-IA

11-20-2005 19:19:30




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 Re: Farmall M High Altitude? in reply to Randy-IA, 11-20-2005 15:48:53  
I said it was only a guess :< My brain must have locked up . I'm bad , bad , OH whoa is me ! I gotta remember to stop guessing ! Take care ... Randy

ps - This is my way of saving face . Or eating crow as the case may be . By the way my sock's taste pretty bad ! :") ---Foot in mouth - you get the idea



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flem

11-20-2005 17:23:31




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 Re: Farmall M High Altitude? in reply to Randy-IA, 11-20-2005 15:48:53  
the high altitude parts, icreased the compression to make up for the thinner air,, the were also used by the low altitude farmers to increase the power od their tractors.



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Pete Zahrt

11-21-2005 08:52:35




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 Re: Farmall M High Altitude? in reply to flem, 11-20-2005 17:23:31  
Thanks for the information! Is there anything special with the carb? ie..different adjustments. Thanks again



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Janicholson

11-21-2005 17:18:55




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 Re: Farmall M High Altitude? in reply to Pete Zahrt, 11-21-2005 08:52:35  
If yours is a high comp. engine (and you live where the land fill is the highest spot in the county like I do) you are in luck. The compression boost will make more ponies. The only issue is adequite fuel. Tractors at high altitude need less fuel to go in that less air. I've been at 14000+ ft in the rockies and its 50 steps up and fifty breaths to catch your wind. The fuel delivery should be set the same as for low altitude. I don't know if the main jet was different, or the load screw was used to compensate. Check parts manuals for that fact.
JimN

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