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High-Altitude Engine

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Author  [Modern View]

07-30-2012 10:38:30

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What is the difference of a Gas engine and a High- Altitude Gas engine? Is it only the piston's?

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Indiana Ken

07-30-2012 18:42:01

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 Re: High-Altitude Engine in reply to miner09, 07-30-2012 10:38:30  
Typically an engine used at higher altitude can use a higher compression ratio without requiring a higher octane fuel. The higher compression helps in part to make up for the power reduction due to the less dense air. The typical way to get the increased compression is with higher dome pistons. Since the air is less dense the carburetor will need to be adjusted leaner.

If the tractor is used at sea level it will have more power than the same tractor with standard pistons however, you will need to insure the fuel has adequate octane for use with the higher compression and dense sea level air. In addition the carburetor will need to be adjusted richer for the dense air.

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07-30-2012 18:29:20

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 Re: High-Altitude Engine in reply to Maxwell99, 07-30-2012 10:38:30  
My TO-35 is a SHM serial no. 197273 , with the ZB-134 continental gas engine. I was told by a tractor rebuilder shop that at one time they had an overhaul kit with a different piston , but if he did mine he would have to use the other kit.
Mine says to operate at 5000 ft. , i'm at 2500 ft. and it has lot's of power compared to my brothers TO-35 with the other 134 engine. That's all I have been able to find out about them.

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07-30-2012 16:19:44

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 Re: High-Altitude Engine in reply to miner09, 07-30-2012 10:38:30  
Years ago we Deer Hunted in Utah and use Honda 4 Wheelers and being from Texas we had to change the Jets in carburetor before it would run right in High-Altitude. I thought this might be a different jetted carburetor.I was told that the tractors used high compression pistons for High- Altitude. Propane engine takes a different piston. I never see overhaul kits that state any difference. I will know when I rebuild.

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Two Dogs

07-30-2012 12:45:43

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 Re: High-Altitude Engine in reply to miner09, 07-30-2012 10:38:30  
I have an FE 35 Standard gas with the SHF prefix and I'm at about 300 feet above sea level. If it ran any better I couldn't hold it. :) TDF

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Richard L

07-30-2012 12:25:58

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 Re: High-Altitude Engine in reply to miner09, 07-30-2012 10:38:30  
I checked in the archives and I noticed a post by John (UK) if that engine was used below 4000 ft above sea level the engine could be hurt. Then there were other posts by others that said with todays higher octane fuels it shouldn't be any problem. That was only two that I checked. There are a lot more posts to read.

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07-30-2012 11:23:40

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 Re: High-Altitude Engine in reply to miner09, 07-30-2012 10:38:30  
about 5000 feet. sorry.

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07-30-2012 15:06:23

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 Re: High-Altitude Engine in reply to s19438, 07-30-2012 11:23:40  
My fe35 gas is also a SHM. I know I'm not at high altitude but it sure ran good, had good oil pressure and no smoke. The plug reading may have been a little rich and the compression was around 140.I thought the only difference was the jetting.

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