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Allis Chalmers Discussion Forum
:

what have I done??

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buford

04-11-2004 19:08:32




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I am building a puller with a wc tractor I have done the engine used a 45 crank 45 rods wc pistons new rings machine shop the head put it back up and I have only 50 lb compression where have I gone wrong? any help would be appreciated,, thanks, Buford




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Brian G. NY

04-12-2004 19:48:16




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 Re: what have I done?? in reply to buford, 04-11-2004 19:08:32  
Buford, I don't know how you could have used the WC pistons with the "45" crank. The distance between the pin and the top of the piston on a WC/WD is greater than that on a "45". I measured a WD piston and the piston height was 9/16" higher than a "45" piston. I don't believe the rods are any different in length. It would seem to me that a "45" crank would push the WC pistons right up out of the block? I'm surprised some of the serious "pullers" haven't chimed in here; they know all about which pieces to use to get the most power from all the WC/WD & WD-45 engines.

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buford

04-13-2004 15:02:38




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 Re: Re: what have I done?? in reply to Brian G. NY, 04-12-2004 19:48:16  
Brian G. I pulled the head today and measured the piston at tc and had 1" clearance from piston to top of deck, I had hoped to have 1/2" clearance to get more compression, We will pull the rods tomorrow and start over . Thanks ,Buford



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Dave K

04-12-2004 11:22:37




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 Re: what have I done?? in reply to buford, 04-11-2004 19:08:32  
The 45 uses the power crater pistons so you will probably need those, not the WC pistons.

Dave



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steve

04-11-2004 20:41:46




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 Re: what have I done?? in reply to buford, 04-11-2004 19:08:32  
buford, im no expert, but the 45 had a 1/2 inch longer stroke, or 1/4 longer throw at both ends. you have installed the 45 crank, but used the 45 rod which i believe is 1/4 inch shorter so the wrist pin ends up in the same spot it was on the WC. You should have move displacement, but you have not changed the compression. I would guess it is still 5.7 to 1. I would think you need to install the WC rods which are 1/4 inch longer to get more compression, with the WC pistons and 45 crank. Believe the original piston clearance was 3/4 inch and that should be reduced to 1/2 inch with the longer crank throw. I hope someone else can confirm this, i believe it it correct.

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buford

04-12-2004 16:08:20




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 Re: Re: what have I done?? in reply to steve, 04-11-2004 20:41:46  
thanks so much Steve, you proberly are right so here we go again,, Buford



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TractorRod

04-12-2004 17:32:28




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 Re: Re: Re: what have I done?? in reply to buford, 04-12-2004 16:08:20  
Buford the Rods I believe are the same between wc and wd45. The way they lowered the compression when they went to the 4.5 stroke was to change the pistons to a crater type instead of the flat tops. I will look in my parts book and get back to you. Thanks Tractor Rod



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