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WD vs. WD-45

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nathan

06-29-2002 16:46:09




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Alright some of you may have seen me before in the ford department... i'm still asking questions for my old man... He wants to know what made the WD differ from the WD-45 as far as power... he wants to know how the WD-45 made 28% more horse than the WD... camshaft? compression? flowing heads? FYI i have noticed that the WD heads don't flow that well... and have alot of room for flowing... please help me out in trying to find the reasoning behind the power increase...

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oldtimer

06-30-2002 18:11:04




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 Re: WD vs. WD-45 in reply to nathan, 06-29-2002 16:46:09  
the late WD's were all the same as the WD45 except for the crankshaft. the wd had a 4in stroke, the wd45 had a 4.5 in stroke get it???45----4.5. put a 4.5 crank in a late model wd and you have a WD45.



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Tom

06-30-2002 18:33:29




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 Re: Re: WD vs. WD-45 in reply to oldtimer, 06-30-2002 18:11:04  
Yes, but you need the power crater pistons too.



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willie

07-07-2002 15:40:56




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 Re: Re: Re: WD vs. WD-45 in reply to Tom, 06-30-2002 18:33:29  
wd had 201 cu in displacement 4 in bore & stroke, wd45 had longer stroke to get approx 225 cu in. also last 6 months or so of wd & wd45 had constant mesh trans( the one with the curved shifter) earlier wd had sliding spur trans(straight up shifter) wd had a drop pin under trans to attach plow etc, wd45 had snap coupler, latched by itself when backing into plow. otherwise very little difference



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steve

06-29-2002 19:26:24




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 Re: WD vs. WD-45 in reply to nathan, 06-29-2002 16:46:09  
nathan, i believe the 45 had a longer throw on the cranshaft, and shorter rods. this made the piston stroke 1/2 inch longer, but the block is virtually the same. thats why the guys say keep the wd rods and crank matched up together and the 45 the same. do not interchange or you will either hit the head, or have very little compression.



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Allis Puller

06-30-2002 04:15:37




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 Re: Re: WD vs. WD-45 in reply to steve, 06-29-2002 19:26:24  
This is in correct, the 1/2" difference of stroke only brings the piston up half, or 1/4". I put put a WD45 crank in, used the WD same rods, and went to 175 pistons. The 175 piston are also another 1/4" taller and this is what gave them their h.p. by increasing the compression. My pistons are still a 1/4" from the top of the block and its got plenty of room for the valves to open. Stock the pistons are 3/4" away. But I strongly suggest not using the 175 pistons in a work tractor for I'm affraid it won't hold together, but a buddy of mine just put in the 45 crank and his runs like a champ.

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STROKE

06-29-2002 17:14:10




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 Re: WD vs. WD-45 in reply to nathan, 06-29-2002 16:46:09  



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