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WD piston interchange
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AllAmericanWD View Drop Down
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Joined: 23 May 2012
Location: PA
Points: 19 		Post Options Post Options   Thanks (0) Thanks(0)   Quote AllAmericanWD Quote  Post ReplyReply Direct Link To This Post Topic: WD piston interchange
    Posted: 23 May 2012 at 5:46pm
Hello all. I am the proud owner of a free Allis WD. It runs great now... but im planning on rebuilding the engine. What is the best piston upgrade for the money? WD45, D17, Sealed Power? Im not looking for a boat load of Hp but from what i have been told an upgrade would be worth the little extra. Thanks
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Bill_MN View Drop Down
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Joined: 12 Sep 2009
Location: Sioux Falls, SD
Points: 1471 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Bill_MN Quote  Post ReplyReply Direct Link To This Post Posted: 23 May 2012 at 9:13pm
most aftermarket sets are 4 1/8 overbore with flat top pistons as opposed to the stock dished pistons for higher compression, you would have to buy the matching sleeves though...stock 4" aftermarket pistons are hard to come by, might find a set of used M&W pistons
1951 WD #78283, 1918 Case 28x50 Thresher #76738, Case Centennial B 2x16 Plow
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MACK View Drop Down
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Joined: 17 Nov 2009
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If you use 45 or D17 you need to go to a WD45 crankshaft.  MACK
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mike a View Drop Down
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Joined: 12 Dec 2009
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Points: 168 		Post Options Post Options   Thanks (0) Thanks(0)   Quote mike a Quote  Post ReplyReply Direct Link To This Post Posted: 24 May 2012 at 8:04am
replace that wd motor with one from a e-gleaner or d-17,you will be way ahead of the game.
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Joined: 11 Sep 2009
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Points: 22825 		Post Options Post Options   Thanks (0) Thanks(0)   Quote CTuckerNWIL Quote  Post ReplyReply Direct Link To This Post Posted: 24 May 2012 at 8:32am
If you use WD45 or D17 pistons with the WD crank, you will have a lower compression ratio and less power. The 45 and 17 have a 4.5 inch stroke so the pin to top of the piston is shorter. 
http://www.ae-ta.com
Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF
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David Maddux View Drop Down
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For a good all around utility tractor, I would just stay with the available rebuild kit.  dave.
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Joined: 12 Sep 2009
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Points: 1471 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Bill_MN Quote  Post ReplyReply Direct Link To This Post Posted: 24 May 2012 at 2:08pm
I believe you could use flat top WD pistons with a WD45 crank, think it's about 8:1 compression
1951 WD #78283, 1918 Case 28x50 Thresher #76738, Case Centennial B 2x16 Plow
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AllAmericanWD View Drop Down
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Joined: 23 May 2012
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Points: 19 		Post Options Post Options   Thanks (0) Thanks(0)   Quote AllAmericanWD Quote  Post ReplyReply Direct Link To This Post Posted: 24 May 2012 at 7:11pm
If I got a kit for my g201 with 4.125" bore pistons wouldn't that be same bore a g226? I was told I could just swap in wd45 pistons and sleeves in a wd. Its a good thing I asked. Where is the best place to buy a full rebuild kit including pistons, rings, sleeves, valve train, bearings, gaskets? Thank you for the help
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norm[ind] View Drop Down
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Joined: 29 Oct 2010
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Points: 2992 		Post Options Post Options   Thanks (0) Thanks(0)   Quote norm[ind] Quote  Post ReplyReply Direct Link To This Post Posted: 24 May 2012 at 7:19pm
  WE HAVE REBUILD KITS OF YOUR CHOICE   1-574-342-4545
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Joined: 01 Jul 2010
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Points: 829 		Post Options Post Options   Thanks (0) Thanks(0)   Quote 79fordblake Quote  Post ReplyReply Direct Link To This Post Posted: 24 May 2012 at 7:21pm
Originally posted by AllAmericanWD AllAmericanWD wrote:

If I got a kit for my g201 with 4.125" bore pistons wouldn't that be same bore a g226? I was told I could just swap in wd45 pistons and sleeves in a wd. Its a good thing I asked. Where is the best place to buy a full rebuild kit including pistons, rings, sleeves, valve train, bearings, gaskets? Thank you for the help


You can use WD45 pistons and sleeves in a WD. But you don't want to do that because it will actually lower your HP.

The WD and WD45 both have a 4 inch bore. But the WD45 has a 4.5 inch stroke...the WD is only 4 inches.

For good reliable power you can throw in a WD45 crank and D17 pistons and sleeves.
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Joined: 23 May 2012
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Points: 19 		Post Options Post Options   Thanks (0) Thanks(0)   Quote AllAmericanWD Quote  Post ReplyReply Direct Link To This Post Posted: 24 May 2012 at 7:36pm
Thats my bad. I should have said same cubic inch displacement not same bore. Im just going with an oversized wd piston. Any suggestions? 
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Joined: 04 Jan 2010
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Points: 1635 		Post Options Post Options   Thanks (0) Thanks(0)   Quote TREVMAN Quote  Post ReplyReply Direct Link To This Post Posted: 25 May 2012 at 10:02am
1/8th over gives 213 cubic inches. Its the least pain for the most gain, Trev.
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Points: 22825 		Post Options Post Options   Thanks (0) Thanks(0)   Quote CTuckerNWIL Quote  Post ReplyReply Direct Link To This Post Posted: 25 May 2012 at 10:10am
Originally posted by AllAmericanWD AllAmericanWD wrote:

Where is the best place to buy a full rebuild kit including pistons, rings, sleeves, valve train, bearings, gaskets? Thank you for the help


Got to the top right of this page and click on (parts etc) Sandy Lake, Tony C, OK tractor and Norm M are a few of the sponsors of this site that can help you out with a total kit. Best have the crank out and checked to make sure it doesn't need ground or maybe has already been ground once or twice.
http://www.ae-ta.com
Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF
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While we are on this subject anybody know what the compression ratio would be if you used 4 1/8 flat top pistons with a WD45 crank? Idea of HP? Thanks.
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Points: 22825 		Post Options Post Options   Thanks (0) Thanks(0)   Quote CTuckerNWIL Quote  Post ReplyReply Direct Link To This Post Posted: 28 May 2012 at 11:09pm
Originally posted by 79fordblake 79fordblake wrote:

While we are on this subject anybody know what the compression ratio would be if you used 4 1/8 flat top pistons with a WD45 crank? Idea of HP? Thanks.

See Bill_Mn's post above. 1/8 over size probably won't make much difference. I would think you could get at least 50hp+ out of it.
http://www.ae-ta.com
Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF
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79fordblake View Drop Down
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Joined: 01 Jul 2010
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Points: 829 		Post Options Post Options   Thanks (0) Thanks(0)   Quote 79fordblake Quote  Post ReplyReply Direct Link To This Post Posted: 29 May 2012 at 6:12am
Originally posted by CTuckerNWIL CTuckerNWIL wrote:

Originally posted by 79fordblake 79fordblake wrote:

While we are on this subject anybody know what the compression ratio would be if you used 4 1/8 flat top pistons with a WD45 crank? Idea of HP? Thanks.

See Bill_Mn's post above. 1/8 over size probably won't make much difference. I would think you could get at least 50hp+ out of it.


Somehow I skipped right over that post...I see it now...lol.
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