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WC Pistons
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David Maddux View Drop Down
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Joined: 13 Sep 2009
Points: 2535 		Post Options Post Options   Thanks (0) Thanks(0)   Quote David Maddux Quote  Post ReplyReply Direct Link To This Post Topic: WC Pistons
    Posted: 14 Dec 2011 at 8:51am
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.
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mlpankey View Drop Down
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Joined: 13 Sep 2009
Location: Vols country
Points: 4580 		Post Options Post Options   Thanks (0) Thanks(0)   Quote mlpankey Quote  Post ReplyReply Direct Link To This Post Posted: 14 Dec 2011 at 9:14am
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.
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DougS View Drop Down
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Joined: 03 Nov 2011
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Points: 2490 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DougS Quote  Post ReplyReply Direct Link To This Post 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.
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CTuckerNWIL View Drop Down
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Joined: 11 Sep 2009
Location: NW Illinois
Points: 22825 		Post Options Post Options   Thanks (0) Thanks(0)   Quote CTuckerNWIL Quote  Post ReplyReply Direct Link To This Post Posted: 14 Dec 2011 at 9:27am
Originally posted by DougS DougS wrote:

You need to consider weight, too.  At the very least you want two pistons of equal weight rotating 180 degrees from each other.

 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
Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF
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David Maddux View Drop Down
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Points: 2535 		Post Options Post Options   Thanks (0) Thanks(0)   Quote David Maddux Quote  Post ReplyReply Direct Link To This Post Posted: 14 Dec 2011 at 12:11pm
I looked them over again and the dish pistons are cast Iron.
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Dave Everett View Drop Down
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Joined: 12 Sep 2009
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Points: 875 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Dave Everett Quote  Post ReplyReply Direct Link To This Post Posted: 14 Dec 2011 at 12:46pm
Kerosene pistons               lower comp.......
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David Maddux View Drop Down
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Points: 2535 		Post Options Post Options   Thanks (0) Thanks(0)   Quote David Maddux Quote  Post ReplyReply Direct Link To This Post Posted: 14 Dec 2011 at 1:00pm
Dave: That is what I was thinking. Might make for easier cranking? Dave.
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CTuckerNWIL View Drop Down
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Joined: 11 Sep 2009
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Points: 22825 		Post Options Post Options   Thanks (0) Thanks(0)   Quote CTuckerNWIL Quote  Post ReplyReply Direct Link To This Post Posted: 14 Dec 2011 at 8:04pm
There ya go Dave. Make her back into a K burner and it should crank easier too. :)
http://www.ae-ta.com
Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF
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