WC Pistons
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=42103
Printed Date: 02 Apr 2026 at 1:41pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: WC Pistons
Posted By: David Maddux
Subject: WC Pistons
Date Posted: 14 Dec 2011 at 8:51am
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I have been looking at two different pistons that is in a couple of engines that I have tore down. Some are a flat top and then some are a dished piston. Both are 4" pistons. What was the difference between the two? I assume that the flat tops are a higher compression piston? Dave. |
Replies:
Posted By: mlpankey
Date Posted: 14 Dec 2011 at 9:14am
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It would depend on the centerline of the piston wrist pin to the top of the piston along with the first compression ring placement as to which would make the most compression . In other words the one that takes up the most space with the first compression ring the highest in the bore at tdc usually makes the most. ------------- people if they don't already know it you can't tell them. quote yogi berra |
Posted By: DougS
Date Posted: 14 Dec 2011 at 9:18am
| You need to consider weight, too. At the very least you want two pistons of equal weight rotating 180 degrees from each other. |
Posted By: CTuckerNWIL
Date Posted: 14 Dec 2011 at 9:27am
I don't think Dave was considering mixing. I believe he is trying to decide which set to use. I would think the dished pistons might be the power crater piston and would not have good compression in a 4 inch stroke. Like Mitch said though, it would depend on the location of the wrist pin bore as to the compression ratio. ------------- 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 |
DougS wrote:Posted By: David Maddux
Date Posted: 14 Dec 2011 at 12:11pm
| I looked them over again and the dish pistons are cast Iron. |
Posted By: Dave Everett
Date Posted: 14 Dec 2011 at 12:46pm
| Kerosene pistons lower comp....... |
Posted By: David Maddux
Date Posted: 14 Dec 2011 at 1:00pm
| Dave: That is what I was thinking. Might make for easier cranking? Dave. |
Posted By: CTuckerNWIL
Date Posted: 14 Dec 2011 at 8:04pm
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There ya go Dave. Make her back into a K burner and it should crank easier too. :) ------------- 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 |