WD piston interchange
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=51023
Printed Date: 23 Aug 2025 at 6:32pm
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Topic: WD piston interchange
Posted By: AllAmericanWD
Subject: WD piston interchange
Date 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 |
Replies:
Posted By: Bill_MN
Date 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 |
Posted By: MACK
Date Posted: 23 May 2012 at 9:35pm
| If you use 45 or D17 you need to go to a WD45 crankshaft. MACK |
Posted By: mike a
Date 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. |
Posted By: CTuckerNWIL
Date 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" rel="nofollow - http://www.ae-ta.com Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF |
Posted By: David Maddux
Date Posted: 24 May 2012 at 9:50am
| For a good all around utility tractor, I would just stay with the available rebuild kit. dave. |
Posted By: Bill_MN
Date 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 |
Posted By: AllAmericanWD
Date 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 |
Posted By: norm[ind]
Date Posted: 24 May 2012 at 7:19pm
| WE HAVE REBUILD KITS OF YOUR CHOICE 1-574-342-4545 |
Posted By: 79fordblake
Date Posted: 24 May 2012 at 7:21pm
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. |
AllAmericanWD wrote:Posted By: AllAmericanWD
Date 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? |
Posted By: TREVMAN
Date Posted: 25 May 2012 at 10:02am
| 1/8th over gives 213 cubic inches. Its the least pain for the most gain, Trev. |
Posted By: CTuckerNWIL
Date Posted: 25 May 2012 at 10:10am
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" rel="nofollow - http://www.ae-ta.com Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF |
Posted By: 79fordblake
Date Posted: 28 May 2012 at 10:19pm
| 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. |
Posted By: CTuckerNWIL
Date Posted: 28 May 2012 at 11:09pm
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" rel="nofollow - http://www.ae-ta.com Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF |
Posted By: 79fordblake
Date Posted: 29 May 2012 at 6:12am
Somehow I skipped right over that post...I see it now...lol. |