WD connecting rods
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=117109
Printed Date: 05 Jun 2025 at 8:28am
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Topic: WD connecting rods
Posted By: littlemarv
Subject: WD connecting rods
Date Posted: 04 Jan 2016 at 10:07pm
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Are the connecting rods the same between a WD and a WD 45? I know the stroke is 1/2" longer on the 45. Thanks in advance. ------------- The mechanic always wins. B91131, WC23065, WD89101, CA29479, B1, Early B10, HB212, 416H |
Replies:
Posted By: skipwelte
Date Posted: 04 Jan 2016 at 10:15pm
| Same rods, same length. Piston height was different. I think 45 rods didnt use shims, WDs did so check your bearing clearances. |
Posted By: littlemarv
Date Posted: 04 Jan 2016 at 10:22pm
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Good point. I remember reading somewhere that the 45 had shims in the mains but not the rods. So, if I bolt the caps on the rods, without bearings, if they are WD rods, they should not be round, because they need to be shimmed. 45 rods should measure perfectly round, no? ------------- The mechanic always wins. B91131, WC23065, WD89101, CA29479, B1, Early B10, HB212, 416H |
Posted By: dawntreader74
Date Posted: 04 Jan 2016 at 10:24pm
| the rods are the same. i have a nice set with pistons on if you need some. 4 inch boor . |
Posted By: WD45Diesel57
Date Posted: 05 Jan 2016 at 7:18am
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I always though rods and pistons where the same other than the dish and it was the crank that gave it the half in more piston height ------------- 1-B's, 2-C, 2-CA's,2-WF, 1-WC,1-G, 3-WD's, 2-WD45, 1-RC, 1-D17 Diesel, 1-D14, 2-D15,1-D17 row crop,1-D19 gas and All Crop 40,60,66,72,90 and 100 |
Posted By: CTuckerNWIL
Date Posted: 05 Jan 2016 at 7:36am
A WD piston with a 45 crank ups the compression ratio way beyond what the 45 had. ------------- 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 |
WD45Diesel57 wrote:Posted By: Ted J
Date Posted: 05 Jan 2016 at 12:23pm
------------- "Allis-Express" 19?? WC / 1941 C / 1952 CA / 1956 WD45 / 1957 WD45 / 1958 D-17 |
Posted By: Lonn
Date Posted: 05 Jan 2016 at 1:52pm
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more speed, bigger carb and taller piston ------------- -- --- .... .- -- -- .- -.. / .-- .- ... / .- / -- ..- .-. -.. . .-. .. -. --. / -.-. .... .. .-.. -.. / .-. .- .--. .. ... - Wink I am a Russian Bot |
Posted By: fixer1958
Date Posted: 05 Jan 2016 at 6:53pm
| The 55 WD45 I just did took shims on the rods. Crank was turned 0.20 on the rods and 0.10 on the mains. Had shims when I took it apart. |
Posted By: littlemarv
Date Posted: 05 Jan 2016 at 8:44pm
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Yes, I just went and checked them, they take shims. You just never know what parts are in 60+ year old machinery...... ------------- The mechanic always wins. B91131, WC23065, WD89101, CA29479, B1, Early B10, HB212, 416H |
Posted By: CTuckerNWIL
Date Posted: 06 Jan 2016 at 9:45am
No, compression ratios were low on the W201 to start with for burning kerosene. As things developed the CR went up a bit and engine rpm went up. By the time the 175 gasser came out they may have been 8.25:1. Quote from an old post in yesterdays tractors. "I completed this conversion on my WD45 and it worked out very well. There is a 1/4" difference in pin height between the two pistons plus the difference in piston top design (flat vs. dished) which brings the compression ratio up to 10.54:1 with a stock 4" bore, 4.5" stroke, and a .075" thick head gasket. There was still at least a 1/4" valve clearance with the WD piston tops when using the stock lift cam. I also converted the tractor to 12V, and using the stock 6V starter, it cranks and starts the engine very easily. (I am not sure how easy it would turn over on 6 volts though). It idles the same (or better) than the 6.4:1 CR WD45 engine and has noticeably more torque. I was also surprised that the exhaust was not much louder than stock. It runs fine under light loads on 87 octane gasoline but you should probably run at least 91 octane, add octane booster, or switch to E85 under heavy loads to avoid detonation. Note: If you are going to run used WD piston sleeves, make sure they do not have any top ring ridge as the pistons will now travel a 1/2" farther up the cylinder than they did with the 4" WD crank, which could break a top ring. (My sleeves were used off ebay and had a small ridge that I was able to hone out) This is a great power upgrade!" ------------- 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 |