Farm Equipment - what if

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what if

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=24902
Printed Date: 24 Feb 2025 at 9:02am
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Topic: what if

Posted By: acd21man
Subject: what if
Date Posted: 29 Jan 2011 at 11:46pm

what if AC would have made a wd45 a 5 in stroke instead of the 4.5 what could it have done good or bad you choose is there a way to do a math problem to figure this type of stuff out to what displacement it would be and horse power and torque it could have been

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2 wd 45,2 D-17 diesel/gas 3 pt, 220,d21, 4020,2 4430s used daily http://www.youtube.com/channel/UCudh8Xz9_rZHhUC3YNozupw

Replies:

Posted By: Sandknob
Date Posted: 29 Jan 2011 at 11:51pm

I really like the 226 engines, but my personal opinion is that they should have dropped a 230 6 cylinder gas in there instead. Would have given them some more weight up front as well.

Posted By: m16ty
Date Posted: 29 Jan 2011 at 11:56pm

It would be 251 cid if my math is correct.

I did see a WC puller that had a 5" stroke and a 4.25" bore. Best I remember they had to grind relief areas in the block to swing 5".

Posted By: MikeB (SD)
Date Posted: 30 Jan 2011 at 9:05am

AC did make a 4.00" bore X 5.00" stroke engine for the model "F" prototype tractors. These were extensively tested in the mid fourties time frame as a replacement for the UC tractors. The engine made 40hp @ 1450 RPM's. I don't know what the compression ratio of that engine was but I would assume around 6:00:1 ratio given the common 74 octane fuel commonly used in those days. The 5" crankshaft was used with the W201 block. Engineering did a lot of testing on these engines so I'm sure there were issues with vibration, bearing life and fuel efficiency.

Posted By: TedBuiskerN.IL.
Date Posted: 30 Jan 2011 at 9:35am

You would have a 10% increase in displacement, so a roughly 10% increase in HP would put you at about 50 on the PTO in stock trim, but the potential would be more than that with minor modifications.

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