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Case Tractors Discussion Forum
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Compression and Rocker Ratio

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NeedingCaseData

10-03-2003 20:58:43




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I have questions about two different tractors. The first two are about a 1949 GAS DC Case. What is stock compression ratio? What is the rocker ratio? My cam grinder needs to know the rocker ratio. My last question is about a Case 830 LP 284 cubic inch engine. What is the rocker ratio for it? If you don't have this information, do you know where I can find it?

Thanks for any help.

Lamont

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Bruce Nelson

10-06-2003 17:42:08




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 Re: Compression and Rocker Ratio in reply to NeedingCaseData, 10-03-2003 20:58:43  
Lamont, rocker ratios are hard to find. They are not always in print. I just tested a rocker for a DC and it is 1.65:1. As for the compression ratio, that is in the service manual as 4.88:1 for a low comp DC and 5.58:1 for a gasoline DC. I doubt your cam profile will need to be adjusted for anything till you get to 8:1 or more. Don't know much about your other tractor. Sorry it took so long. Bruce

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Lamont

10-06-2003 18:23:46




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 Re: Re: Compression and Rocker Ratio in reply to Bruce Nelson, 10-06-2003 17:42:08  
Bruce,

Thanks for the info. How do you test the rocker ratio? Can you just move the short side 1 inch and check the distance the long side moves? I'm not even sure if that's what the rocker ratio means. I'm a Math teacher so if you can explain it, I think I can understand it. I appreciate your help.

Lamont



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