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Tractor Pulling Discussion Forum

Piston Decking

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Agdude

02-16-2004 22:26:55




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I am looking at some pistons for my pulling tractor that will work good if I mill about .075" off the top. Will most aluminum auto pistons stand this? They are flat with valve reliefs. I'm a little worried.




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Proredpuller

02-17-2004 05:55:13




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 Re: Piston Decking in reply to Agdude, 02-16-2004 22:26:55  
As a rule of thumb, you can go as thin as .175 (depending upon the quality of the material used)and be safe as long as its a naturally aspirated engine and no NOS. Just measure the thickness and see what you've got. Sometimes this can be a little challenging with valve reliefs but you can get close. I usually try to stay in the .200 range with forged pistons but have seen folks go as low as .165 and work just fine. Hope that helps.

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Agdude

02-17-2004 19:12:37




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 Re: Re: Piston Decking in reply to Proredpuller, 02-17-2004 05:55:13  
It sure does help. Thank you.



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CASEPOWER

02-17-2004 05:36:27




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 Re: Piston Decking in reply to Agdude, 02-16-2004 22:26:55  
.075 is not much for most pistons. I just took .130 off of a chevy BB 366 piston. It had one relief and was a clevite. Most of the cast pistons are very thick.



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Agdude

02-17-2004 19:10:59




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 Re: Re: Piston Decking in reply to CASEPOWER, 02-17-2004 05:36:27  
Was that a forged piston?



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TimC

02-17-2004 19:19:15




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 Re: Re: Re: Piston Decking in reply to Agdude, 02-17-2004 19:10:59  
Cast pistons are poured into a mold and forged pistons are stamped (for lack of a better word) under heat and pressure as I understand it. It makes a denser stonger lighter piston.

When milling it is also a good time to design the floor of the combustion chamber which is the top of the piston if you know what I'm getting at.



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