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WC/WD45 are the blocks the same?

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Brian

07-24-2001 21:39:53




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I have a 1944 WC and I've been looking for a WD45 to rebuild. I've noticed that on the right side of the engine block (as you sit on the tractor) there is a casting number of U3019-xx. The xx being numbers ranging from 18-34 on the tractors I've seen. The bore size on a later model wc is 4" with 201 CID. The bore on a WD45 is 4" with a 226 CID so the strock must be longer on a WD45, but the casting numbers are the same on the block for either model. What makes a WD45 25 CID larger than my WC? Is the Crank jurnal longer? Are the heads different? Are the sleeves longer? Or doesn't the casting number mean anything?

Brian

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Brian G. NY

07-25-2001 07:07:55




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 Re: WC/WD45 are the blocks the same? in reply to Brian, 07-24-2001 21:39:53  
The WC & WD blocks are basically the same. The WD-45 blocks are different but internals from all will interchange if matched properly. Many people put the WD-45 crank (4.5" stroke vs 4" stroke) in WCs and WDs to bring them up to 226 CID. Most people also increase bore when rebuilding by using 4-1/8" sleeves and pistons. Try one of the :pulling" sites; many people there are familiar with all the tricks to make horsepower from these engines.

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Brian

07-25-2001 11:23:02




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 Re: Re: WC/WD45 are the blocks the same? in reply to Brian G. NY, 07-25-2001 07:07:55  
If they replace the crank with a WD-45 that is a 1/2" longer stoke, doesn't that push the piston out the top of the block? The centerline of the crank doesn't change therefore the rod length must by 1/2". If this is the case then either the WC piston stops 1/4" short of the head or there is a difference in the head of a WD-45 with a 1/4" pocket and the sleeves must also be longer by 1/2".

Brian

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Aaron

07-25-2001 15:59:04




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 Re: Re: Re: WC/WD45 are the blocks the same? in reply to Brian, 07-25-2001 11:23:02  
The heads on all W series engines are flat, the combustion chamber is in the cylinder. To use the 45 crank, you need to use pistons for a 45 crank, ie: WD45 and up (D series, or numbered) pistons.
Aaron



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steve

07-25-2001 14:59:02




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 Re: Re: Re: WC/WD45 are the blocks the same? in reply to Brian, 07-25-2001 11:23:02  
I am certainly not a WD45 expert, but know the engines can be updated as described above. The common practice on a truck engine that gets a longer stroke crank is to use pistons with a deck height 1/4 inch closer to the pin than original pistons, or a connecting rod that is 1/4 inch shorter in length. Either will work, but i dont know how they did it on the WD45. The total stroke is determined by the crank, not the piston or rod length. They can be adjusted to get the proper head clearance.

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Brian

07-26-2001 08:30:07




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 Re: Re: Re: Re: WC/WD45 are the blocks the same? in reply to steve, 07-25-2001 14:59:02  
Thank you for all your responses. After carefully assessing the info I've gotten it all makes sense now. I realize now that the rod has nothing to do with the stroke. I hadn't considered the wrist pin centerline relative to the top of the piston could be 1/4" shorter and that is how it must work. Now I will make the assumption that the WD-45 sleeves will be long enough and will fit into the block.

What about carboration? Is the carborator the same on both the WC/WD and the WD-45?

Thanks again!

Brian

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