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Piston hitting counterbalance
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   Forward Look Technical Discussions -> Engine, Exhaust, Fuel and IgnitionMessage format
 
Myke
Posted 2020-10-11 6:58 PM (#604346)
Subject: Piston hitting counterbalance



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Location: Tulare Ca
Hey all! got a question for yall. So In my recent engine rebuild (58 318 cast iron poly) I was replacing the pistons (but not the rods) and after installing them all, went to spin the crank and realized that the bottom of the pistons are hitting the counter balance. So I pulled the pistons to compare with the old and realized that the boss for the wrist pin is thicker and taller than the original. Would it be possible to grind/machine the .050 or so clearance needed to clear the counterbalance? Or would this compromise the wrist pin boss?

Edited by Myke 2020-10-11 6:59 PM
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Powerflite
Posted 2020-10-11 8:20 PM (#604353 - in reply to #604346)
Subject: Re: Piston hitting counterbalance



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That should be fine as long as you aren't running a stroker combo that already has really short skirts on the piston. Just cut them all evenly, debur carefully and balance them afterward.

Be sure to give yourself some good clearance too. The aluminum expands a lot with heat and you don't want them colliding when it is hot.

Edited by Powerflite 2020-10-11 8:22 PM
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Mopar1
Posted 2020-10-11 8:21 PM (#604354 - in reply to #604346)
Subject: Re: Piston hitting counterbalance



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I'd think you'd need to clearance the skirt & rebalance the pistons.
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Shep
Posted 2020-10-12 11:45 AM (#604370 - in reply to #604354)
Subject: Re: Piston hitting counterbalance



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I'd say those are the wrong pistons.
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