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aluminum pistons vs cast iron pistons

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Bill in BC

09-16-2007 13:48:47




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I am wondering, are the aluminum after market pistons that are available for the two cylinder tractors, all fuel style or gas style. Is there any difference in the operating characteristics between an engine with aluminum pistons and one with cast iron pistons. I once read somewhere that aluminum pistons make a two cylinder sound different.




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Bill from Scotland

09-17-2007 04:32:26




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 Re: aluminum pistons vs cast iron pistons in reply to Bill in BC, 09-16-2007 13:48:47  
Perkins P6 diesels as used in the Fordson e27n Major used both cast iron and aluminium pistons during production. Cast iron versions were slower reving and made a much different sound from the ones fitted with aluminium. Dont know about any other models.



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135 Fan

09-16-2007 21:31:12




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 Re: aluminum pistons vs cast iron pistons in reply to Bill in BC, 09-16-2007 13:48:47  
In Cat literature for my machine it says aluminum pistons that expand with the heat of combustion. Dave



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bill mar

09-16-2007 15:05:13




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 Re: aluminum pistons vs cast iron pistons in reply to Bill in BC, 09-16-2007 13:48:47  
I have often wondered what it did to the balance.



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Walt Davies

09-16-2007 19:26:47




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 Re: aluminum pistons vs cast iron pistons in reply to bill mar, 09-16-2007 15:05:13  
Actually the size and weight of the pistons has nothing to do with the balance of the engine. You don't rebalance the crank when putting in oversize pistons so why do it for aluminum pistons.
Walt



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Spook

09-17-2007 04:21:14




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 Re: aluminum pistons vs cast iron pistons in reply to Walt Davies, 09-16-2007 19:26:47  
I don't know about changing pistons, but we used to make millions of the things, and each piston went thru a weight station - the weight of the piston was very carefuly controlled. I think one advantage of aluminium pistons is that the casting process can be more closely controlled, resulting in less machining, and less variation. It has been awhile, I think the weight spec was +/- 2.5 grams.



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Bob

09-16-2007 18:56:04




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 Difference in weight? in reply to bill mar, 09-16-2007 15:05:13  
How much actual weight difference is there? Aluminum is "lighter" but I suspect the aluminum pistons will have MORE metal in them, at least partially offsetting the difference in the "weight" of the metals.

Furthermore, one piston is always moving in the opposite direction of the other piston, so, no matter WHAT they acually weigh, they "cancel each other out".



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RAB

09-16-2007 14:05:20




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 Re: aluminum pistons vs cast iron pistons in reply to Bill in BC, 09-16-2007 13:48:47  
Don't know, not sure, but cold clearances may well be different with different coefficients of expansion. Balance will be different due to changed reciprocating mass. Someone with a well tuned ear, to this sort of thing, might easily discern the differences. I don't know whether there would be any normal operational differences but I would expect that the piston speed (read rpm) can be increased more safely with alloy pistons, so more power available, if that was the aim, with appropriate breathing modifications. I would think that either both types are available or other mods would allow all-fuel system to be used.

Regards, RAB

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Bill In BC

09-16-2007 14:01:12




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 Re: aluminum pistons vs cast iron pistons in reply to Bill in BC, 09-16-2007 13:48:47  
I meant to post this in the John Deere Forum.



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