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Allis Chalmers Discussion Forum
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'45 pistons in a wc

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slowride

04-11-2006 18:31:51




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Can I get wd45 pistons in a wc without boring it?
If so, how much harder would it be to crank it?
Slowride>




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slowride

04-12-2006 18:00:35




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 Re: '45 pistons in a wc in reply to slowride, 04-11-2006 18:31:51  
thanks guys, i guess i'll just stick to a '45 crank.



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Texas Denny

04-12-2006 07:06:10




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 Re: '45 pistons in a wc in reply to slowride, 04-11-2006 18:31:51  
I think Kip said it best. Putting in 45 pistons in WC/WD without changing the crank will result in very low compression and power. There are some high compression WD pistons out there but I don't know where to get them. My WC has 8:1 compression instead of the standard 5.5:1. Don't know where these pistons came from.



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Kent of SW MO

04-12-2006 06:20:50




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 Re: '45 pistons in a wc in reply to slowride, 04-11-2006 18:31:51  
The compression height, location of the wrist pin, of the WC/WD and the WD-45 are different. The wrist pin on th WD-45 piston is closed to the top of the piston than the WC/WD piston.

Kent



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Kip[UT]

04-12-2006 05:47:31




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 Re: '45 pistons in a wc in reply to slowride, 04-11-2006 18:31:51  
You would have extremely low compression using 45 pistons with a 4" WC or WD crank. A 4.5" WD45 crankshaft will drop right in these earlier engines along with the 45 "crater" pistons. All of these engines use the same connecting rods. You just need make sure what size your sleeves are. They can be either the stock 4" bore or 1/8" oversize. You can get both flat top or 45 stle cater pistons for either size bore.

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old

04-11-2006 21:11:04




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 Re: '45 pistons in a wc in reply to slowride, 04-11-2006 18:31:51  
Well from what I understand the WC and the WD-45 use the same piston but differant crank shafts. So you will not get any thing form changeing pistons other then spending $$$$. Now if you change crank shafts then you get more HP etc



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John (MO)

04-12-2006 06:15:25




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 Re: '45 pistons in a wc in reply to old, 04-11-2006 21:11:04  
I don't believe they are the same pistons at all.



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JMS/MN

04-12-2006 07:49:48




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 Re: '45 pistons in a wc in reply to John (MO), 04-12-2006 06:15:25  
You're right- the WC had a flat top piston while the WD45 had the Power Crater piston, which had a concave top. That's where the 'crater' part came in.



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