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Case Tractors Discussion Forum
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BIG bore in DC

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DCPULLER

10-03-2005 15:35:02




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I'm taking my DC block to the shop this week to see how big of bore I can get in it. Hoping for 4 7/8". Will be hard blocking entire block solid. Keeping stock stroke and going for 300 pounds cyl preasure. Has anyone heard of a bore this big in a DC or will this be the first if possible. Let me know. Thanks, Dave S




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Bruce Nelson

10-04-2005 05:34:37




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 Re: BIG bore in DC in reply to DCPULLER, 10-03-2005 15:35:02  
4 5/8" bore is about it. Any more and you get too deep into the pushrod wall. The headbolts also start to get real close to the bore. I imagine you could relacate the headbolt holes somehow, maybe move the bore centers over a bit and go bigger, never seen that (yet). Bruce Nelson



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Thad

10-03-2005 17:09:26




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 Re: BIG bore in DC in reply to DCPULLER, 10-03-2005 15:35:02  
The bore part im not sure about. But i ill give you my two cents on 300lbs compression. Ive built a L with 260lbs or so. Sounded great had a cam cut the engine sounded awsome. But pulled like crap it didnt have any more power than my stock engine had. So i removed the lp head and placed a gas one on it and gained a ton of power. Pulled 3rd gear and always ran out of power with the high press now i can run 3rd and can spin out. I think you need higher rpms with that kind of compression. Just my two cents. Thad

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Camboted

10-03-2005 16:05:12




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 Re: BIG bore in DC in reply to DCPULLER, 10-03-2005 15:35:02  
I've heard guys say they got 400 cubes out of a DC but, I don't know how. With all that power I'd be scared to death of breaking the block at the rear main bearing. That sems to be the weak point in the DC block.



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dctom

10-03-2005 16:07:42




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 Re: BIG bore in DC in reply to Camboted, 10-03-2005 16:05:12  
ted 400 cubes??? that is easy guys are now talking 500 ci in DC's just have to support rear main and that is not too hard tom



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Camboted

10-03-2005 16:24:20




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 Re: BIG bore in DC in reply to dctom, 10-03-2005 16:07:42  
Tom, how do you do that?



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dctom

10-04-2005 06:47:43




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 Re: BIG bore in DC in reply to Camboted, 10-03-2005 16:24:20  
ted. drill down from the little ledge at back of block and use long strong bolts, that is the way the one i had was done and it worked had 100 hp tom



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