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Massey Harris & Massey Ferguson Tractors Discussion Forum
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Differents in pistons?

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Gus Hansen

01-31-2006 07:18:53




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I"ve got a dumb question? What is the different between a HIgh altitude piston and a standard piston? Do they build more compression then standard ones? Thank You.




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Aaron Ford

02-01-2006 08:06:51




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 Re: Differents in pistons? in reply to Gus Hansen, 01-31-2006 07:18:53  
My owners manual MF65 stated that there was a high altitude option available. Compression was bumped from 7.0:1 (kerosene & dirty water?) to 8.0:1. The base timing was dropped from 6 degrees to 4. It mentions that the carb adjustment would be different, as well. The fuel specified was 82 octane. External cues are a tag mounted beside the motor tag and a decal on lower dash assembly reading simply "High Altitude"

As a hot rodder, I am aware that even the most poorly designed cast iron combustion chambers can handle 9-9.5:1 with modern pump gas. So without additional information, I believe that 8.0:1 is possible and perhaps more with head work. I see no reason to keep said tractor above 4000ft when using a quality fuel. Now if I could machine a good quench area....

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Harris Guy

01-31-2006 08:50:35




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 Re: Differents in pistons? in reply to Gus Hansen, 01-31-2006 07:18:53  
You already are onto the answer. Using domes and
higher compression were the methods half a century
ago. In that 'light' air, power was achieved. If
you bring this old iron to lower elevation, more
power. Manuals often advised against operating a
High altitude model at below a certain level, such as...3200 ft. However, an H260/277 is a very
durable engine, and barring abuse, will function
well with basic tune up. The M & W piston kits were designed in similar direction. If you hand
crank an H260, with M & W's, no way to spin the
crank, w/that pronounced compression.

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