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JamesP 
Bronze Level
Joined: 06 Jul 2018
Location: ohio
Points: 79
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 Topic: custom pistons
Posted: 18 May 2023 at 4:08am |
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Any suggestions on where to get pistons made? Model UC, thanks
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injpumpEd
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Joined: 13 Sep 2009
Location: Walnut IL
Points: 5122
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Posted: 18 May 2023 at 7:37am |
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Not sure they can make all pistons, but EGGE makes some custom pistons for really old engines.
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210 "too hot to farm" puller, part of the "insane pumpkin posse". Owner of Guenther Heritage Diesel, specializing in fuel injection systems on heritage era tractors. stock rebuilds to all out pullers!
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CAL(KS)
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Joined: 18 Sep 2009
Location: Chapman, KS
Points: 3804
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Posted: 18 May 2023 at 8:17am |
I spoke with Dan Karpel @ Crank Machine service a few years ago about pistons for a UC after he did a crank for me and he had a source. He suggested making a fiberglass resin cast of the head chamber to give most accurate shape for best dome configuration. Life has gotten in the way and i have yet to do it. Id be interested in doubling your order depending on what you go with, if you decide to roll with it. I guess we have talked this over James, but dont remember if i ever got you the contact info
Edited by CAL(KS) - 18 May 2023 at 8:28am
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Me -C,U,UC,WC,WD45,190XT,TL-12,145T,HD6G,HD16,HD20
Dad- WD, D17D, D19D, RT100A, 7020, 7080,7580, 2-8550's, 2-S77, HD15
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JamesP
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Joined: 06 Jul 2018
Location: ohio
Points: 79
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Posted: 20 May 2023 at 3:37pm |
Hey Cal, I am sending one of my pistons to extreme tractor parts-Ray. I ended up having my sleeves bored .030 over. I am having .500 added to compression ht. This will be 7-1 CR and the piston will be .060 below the spark plug hole so it wont require any features on top. Calculates show hp around 65. Plenty for me, I am not competing just want enough that it never powers out on the fun pulls and I can still hand crank it-- LOL.
I am only guessing but with your stroke, it would push the piston up enough to gain a lot more compression plus CI. You could buy new sleeves and rings and run stock pistons.??
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NEVER green
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Joined: 28 Feb 2013
Location: MN.
Points: 8682
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Posted: 21 May 2023 at 9:37am |
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2-8050 1-7080 6080 D-19 modelE & A 7040 R50
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CAL(KS)
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Joined: 18 Sep 2009
Location: Chapman, KS
Points: 3804
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Posted: 22 May 2023 at 7:35am |
 JamesP wrote:
Hey Cal, I am sending one of my pistons to extreme tractor parts-Ray.I ended up having my sleeves bored .030 over. I am having .500 added to compression ht. This will be 7-1 CR and the piston will be .060 below the spark plug hole so it wont require any features on top. Calculates show hp around 65. Plenty for me, I am not competing just want enough that it never powers out on the fun pulls and I can still hand crank it-- LOL.
I am only guessing but with your stroke, it would push the piston up enough to gain a lot more compression plus CI. You could buy new sleeves and rings and run stock pistons.?? |
yeah i have to run short bbc style piston just to keep the rings in the sleeve with the stroke and custom rods i have. Was going to run 4.625 bore as can be done without machine work on block, so will be 445 cubes if i ever get it done. being a UM engine im in uncharted territory but i dont really have the finances to be a guinea pig lol. if im going to do something i just as well make it a worth while though....
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Me -C,U,UC,WC,WD45,190XT,TL-12,145T,HD6G,HD16,HD20
Dad- WD, D17D, D19D, RT100A, 7020, 7080,7580, 2-8550's, 2-S77, HD15
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cms
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Joined: 29 Nov 2010
Location: collinsville il
Points: 70
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Posted: 25 May 2023 at 9:52am |
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Can help with custom pistons.
Dan Karpel
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