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Piston tolerance?

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Roger H. Brown

10-01-2001 08:10:50




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I am presently in the process of having my John Deere A bored out .125 over and putting in aluminum pistons. My question, how much should the tolerance be as aluminum pistons I would think heat up much quicker and swell more than regular cast pistons. Thanks




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Gman

10-03-2001 19:25:37




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 Re: Piston tolerance? in reply to Roger H. Brown, 10-01-2001 08:10:50  
Roger I purchased a set of aluminum pistons from Henrich Pistons in Ind. and he recommended a min. of 10 thousands clearance,now on my puller I run 18 thousands,but they are short skirted fat pistons extremely thick in the pin area. I would question a piston maker and see what they recommend. Don't take your block and pistons to a machine shop and expect them to tell you,they'll give it the clearance the book recommends for a stock piston,so be careful and let the machine shop know what you want,been there done that and I got a tight "G" later Gman

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G Taylor

10-01-2001 18:29:52




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 Re: Piston tolerance? in reply to Roger H. Brown, 10-01-2001 08:10:50  
If the block will cleanup with only a 45 thou boring only go that far. The cubic inches gained is slight even at 125 thou. Any extra power developed gets soaked out faster to the water jacket through the thinner metal.



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Jerry B

10-01-2001 11:36:17




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 Re: Piston tolerance? in reply to Roger H. Brown, 10-01-2001 08:10:50  

The general rule of thumb says that you should provide .003-.004 of an inch per inch of piston diameter. That means if you have a 5 inch piston you need about .015-.020 of an inch total clearance. You can run tighter tolerances if you do not let the engine get hot as that reduces the clearance very quickly as the piston swells tremedously at elevated temps.

Others here may provide more detailed and more relevant info on any given appication.

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Gpower

10-01-2001 08:14:38




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 Re: Piston tolerance? in reply to Roger H. Brown, 10-01-2001 08:10:50  
They will not swell much if any. All the times ive bored out, I have put 12-14 thousanths. Just my 2 cents worth, good luck



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