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Case Tractors Discussion Forum
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DH All-fuel head/piston questions

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Ken in AZ

09-12-2006 19:12:01




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Need some help. Got a 1940 DH, all-fuel head, venturi"s, intake and such. Happened to compare the pistons with some from a 1951 DI, thinking they might be a little higher compression and larger bore. Nope... both appear to be 3 7/8" and the DH pistons are somewhere around 1/8" taller.

Seems odd to me. The DI is a gas tractor and I would have thought it would have had higher compression pistons... does it maybe have a smaller chamber in the head? Or do the venturis affect something in there? What are they supposed to do anyway?

I"m not a puller but want to know what I might need to do if ever get a DC I can turn up a bit. Can"t let the green tractors have all the fun. :)

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dboll

09-13-2006 05:04:01




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 Re: DH All-fuel head/piston questions in reply to Ken in AZ, 09-12-2006 19:12:01  
There are alot of 3 7/8 high altitude pistons around which work with the 4570 head, they are taller, I take those venturis out.



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Ken in AZ

09-13-2006 08:16:31




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 Re: DH All-fuel head/piston questions in reply to dboll, 09-13-2006 05:04:01  
Dboll, Thanks for the information on the high-altitude pistons. Is there any information available as to how to identify the different pistons?

Ken in AZ



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SmartAxe

09-13-2006 12:00:54




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 Re: DH All-fuel head/piston questions in reply to Ken in AZ, 09-13-2006 08:16:31  
Ken,
Give a shout out to DCTom so he can check your serial number against the build cards. I know on some of the older DCs equipped with high altitude pistons, they stated so on the build card. If you"re questioning if yours has them the build card may tell you.

I believe the difference is that the high altitude pistons rise above the top of the block a bit. With that low compression 4570 head, there"s plenty of room for the piston top to stick up into that huge combustion chamber without hitting any valves. The standard altitude pistons only rise to the top of the block and don"t protrude into the combustion chamber of the head at all.

-Mark

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Ken in AZ

09-13-2006 18:21:59




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 Re: DH All-fuel head/piston questions in reply to SmartAxe, 09-13-2006 12:00:54  
I have the build cards. DCTom looked it up and I actually got copies from Rich Tworek for the 3 D"s that I have... but there is no mention of high-altitude pistons on the build cards.

On the other hand, the pistons do stick up above the block on this one, just as you describe, and knowing a little bit about the folks that overhauled it in the 1950"s, they did what they could to bump the compression. (Dad says an uncle and a family friend worked on it when my uncle was in high school)

Thanks! That helps clear up some mystery.

Ken in AZ

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