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Massey Harris & Massey Ferguson Tractors Discussion Forum
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High altitude petrol

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Jens Lyn

03-28-2004 04:53:10




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Hi,
I have seen a MF 35 with the serial number SHF 241615.
This should be Standard, High altitude petrol and Single clutch.
Does anyone know the difference between the MF 35 normal petrol and the high altitude petrol.




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Jerry/MT

03-28-2004 21:59:25




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 Re: High altitude petrol in reply to Jens Lyn, 03-28-2004 04:53:10  
I'm not sure but I believe the carburetor has slightly smaller jets to lean the carb out for high altitude (above 5000 ft) operation. Do a search in the archives on the left and see what you can find. I doubt that there is any such thing as high altitude petrol.



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Jens Lyn

03-29-2004 09:10:35




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 Re: Re: High altitude petrol in reply to Jerry/MT, 03-28-2004 21:59:25  
Thank's Jerry,

I did a search on "high altitude" and got different interesting stuff. It seems you are right, and there could also be some special high-altitude pistons and fire chamber. But I did'nt find anything specific on MF 35. I wonder how this model ended up here in Denmark, where we are just around sea level, and the highest mountain is 175 metres (app. 500 ft)?



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Steve

03-29-2004 11:42:43




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 Re: Re: Re: High altitude petrol in reply to Jens Lyn, 03-29-2004 09:10:35  
I have a 'high altitude' MF50 (indicated by the remains of a factory label on the lower section of the inst. panel). From what I have read, the compression ratio is 8.1:1 instead of 6.3:1. My compression is pretty good for my elevation (7000') and I need all the compression 'help' I can get. (Recall that compression loss is approx. 3% per 1000'.) I don't believe this tractor has a different carburetor or other modifications - just the engine compression is higher.

Steve

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