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Harry Ferguson Tractors Discussion Forum
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High-altitude TO35 used at sea level

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Jimbo

07-21-2003 14:35:02




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I have a high altitude TO35. It's been used at sea level for 10 years or so. Somewhere I read a warning about using it at altitudes below 1000 feet, I think in the operators manual but can't find it now. I know it has a little higher compression ratio (6.6:1 instead of 6:1).

What happens when a high altitude engine is operated at lower altitudes and also when a low altitude engine is operated at high altitude?

Jimbo

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Randy

07-22-2003 20:33:25




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 Re: High-altitude TO35 used at sea level in reply to Jimbo, 07-21-2003 14:35:02  
Folks: I think that when those engines were first designed, the early to mid 50's, gasoline octane was lower than now. If I remember right, the manual says to use an octane of 82, or somewhere in that area. That's way lower than todays lowest of 87, so the high altitude engine would probably knock at low altitudes. Using todays gas with an octane of 87-89, and a richer air-fuel ratio, the engine would probably work ok. Do the rebuild kits all have flat topped pistons?

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Paul in AZ

07-21-2003 20:07:50




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 Re: High-altitude TO35 used at sea level in reply to Jimbo, 07-21-2003 14:35:02  
Jimbo,

The high-altitude engine is basically the same as the regular Z134 engine except for modifications to improve performance above the 5,000’ level. The engine is fitted with flat top pistons which increase the compression ratio from 6.6:1 to 8.1:1.

The ignition system for a high altitude Z134 is the same as for the standard engine except the static spark setting is 3° BTDC instead of 6° BTDC as found in the regular Z134 engine. The carburetor is the same except the power and idle needles must be set leaner to provide the correct air/fuel ratio in the lighter air. The engine is marked with a permanent tag which reads, “WARNING, DO NOT OPERATE BELOW 5,000 FEET.”

I'm not an expert at what happens if these adjustments are not made when operating a high altitude engine at less than 5,000 ft.

Paul Nelson
Editor
Ferguson Furrows

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Jimbo

07-22-2003 16:19:30




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 Re: Re: High-altitude TO35 used at sea level in reply to Paul in AZ, 07-21-2003 20:07:50  
Appreciate the info. More than I expected. How can I contact Ferguson Furrows? You can post it here or email me at the link above.



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Paul in AZ

07-22-2003 20:47:32




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 Re: Re: Re: High-altitude TO35 used at sea level in reply to Jimbo, 07-22-2003 16:19:30  
To join Ferguson Enthusiasts of North America (FENA) and receive the newsletter, Ferguson Furrows (5 issues per year), send $10 ($12 Canada, $17 overseas) to John Iwen, FENA Treasurer, 1811 Parkway Drive, Bettendorf, IA 52722.

Paul Nelson



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Jerry/MT

07-22-2003 09:30:29




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 Re: Re: High-altitude TO35 used at sea level in reply to Paul in AZ, 07-21-2003 20:07:50  
Operating this engine below 5000 ft with the modifications you have stated should only require enrichment of the fuel/air ratio on the carb to prevent too lean a mixture and thus high exhaust gas temperatures which can burn the valves. "Read" your sparkplugs after you make a mixture adjustment. No soot on them (over rich mixture ratio) or no glaze or burned look (too lean mixture ratio). You might have to play with the timing and set it back to the original 6 BTDC also. The thermal efficiency of this engine should be better than the stock engine becuse of the higher compression ratio. Hope this helps.

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