M&W AP-46 oops
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=22310
Printed Date: 13 Feb 2025 at 4:36am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: M&W AP-46 oops
Posted By: Larry(OH)
Subject: M&W AP-46 oops
Date Posted: 14 Dec 2010 at 6:59pm
Here is what happens when you use a 45 crank with the WD pistons. You end up with a great model to use for fly cutting pistons!!
 This was my fault due to not paying attention when assembling. I actually pulled it like this for a summer and when I changed oil the one day a piece of metal came out hole. Pulled pan and found the metal around wrist pin broke and barely hanging on ------------- '40 WC puller,'50 WD puller,'50 M puller '65 770 Ollie *ALLIS EXPRESS contact* I can explain it to you, BUT I cannot understand it for you!! |
Replies:
Posted By: wi50
Date Posted: 14 Dec 2010 at 8:00pm
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I bet the comperssion is pretty high, I've got some M&W pistons here from a WD and I measured things up, should be around 13.5 to 1, or maybe slightly better.
I'm suprised that it didn't hit the head. Tomorrow when I go to the shop, I'll measure the compression height of the pistons, 2.935 sticks in my mind for the M&W for a WD but I don't rember for sure. WIth a 12.655 deck, 7.5" rod and a 2.25 crank offset the piston would come .030 out of the block, add about .045 or so for a compressed head gasket and I figured they would hit the head or at least hit with a few RPM but maybe not. I've got the same setup laying on the shelf to swap into one, but I was going to put the pistons in the lathe and trim a bit out of the bowl, cut valve reliefs and re check height to build a complete quench engine, figureing I'd give it .030 quench.
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Posted By: mlpankey
Date Posted: 14 Dec 2010 at 9:39pm
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well larry you know exactly where to cut them. Wi 50 theys alot of hype on quench . I think its useful on high rpm engines to kill detonation by creating swirl . i just dont think its that big of a magic trick on a chug chug tractor rpm . Tractor that has a wedge design combustion chamber in the head and has pushed compression ratio to the limit for the fuel all the spark advance it wil take and make 7 grand on the tac during runs then i will say quench has some hocus pocus . ------------- people if they don't already know it you can't tell them. quote yogi berra |