Cummin's pistons
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Joined: Apr 2002
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From: MidWest
Re:Cummin's pistons
I believe the pistons are aluminum.
That is why the max temp is somewhere around 1350* for no more than 30 (or so) seconds.
Anything more than that, and you will find out what the pistons are made of first hand.
Rich
That is why the max temp is somewhere around 1350* for no more than 30 (or so) seconds.
Anything more than that, and you will find out what the pistons are made of first hand.
Rich
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Joined: Jun 2003
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From: SLC UT
Re:Cummin's pistons
So if cummins puts aluminum pistons in there engenes, and GM uses aluminum heads , why do the heads fail on the GM ? and so why dont we see cummins pistonn fail becouse they are aluminum ? this does not make sence to me.. am I being stupid. 
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Re:Cummin's pistons
[quote author=routerguy99 link=board=8;threadid=17976;start=#msg168591 date=1060120117]
So if cummins puts aluminum pistons in there engenes, and GM uses aluminum heads , why do the heads fail on the GM ? and so why dont we see cummins pistonn fail becouse they are aluminum ? this does not make sence to me.. am I being stupid.
[/quote]
Maybe because the Cummins pistons don't use gaskets for sealing...
Aluminum DOES have it's place in an engine - the problem that sometimes arises when aluminum is used against cast iron or other metals is uneven expansion rates - that is dealt with by various means where pistons are concerned - but a different technology and approach must be used where aluminum heads and cast iron blocks are concerned - and I won't even START on warpage, valve guide wear, and a whole OTHER can of worms where aluminum heads are concerned...
;D ;D
So if cummins puts aluminum pistons in there engenes, and GM uses aluminum heads , why do the heads fail on the GM ? and so why dont we see cummins pistonn fail becouse they are aluminum ? this does not make sence to me.. am I being stupid.
[/quote]
Maybe because the Cummins pistons don't use gaskets for sealing...
Aluminum DOES have it's place in an engine - the problem that sometimes arises when aluminum is used against cast iron or other metals is uneven expansion rates - that is dealt with by various means where pistons are concerned - but a different technology and approach must be used where aluminum heads and cast iron blocks are concerned - and I won't even START on warpage, valve guide wear, and a whole OTHER can of worms where aluminum heads are concerned...
;D ;D
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Joined: Mar 2003
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From: New Holland, PA
Re:Cummin's pistons
Ditto to what Gary said. Cast iron pistons are too heavy, they went out in the '30's. Steel topped aluminum pistons have been used in some diesel designs to allow higher cylinder pressures and temperatures, but they have to run at lower speeds due to the extra weight.
The way expansion is dealt with in pistons is by making them slightly out of round and also slightly tapered when cold, so they expand into shape at operating temperature. One more reason not to flog your engine until it's warmed up.
The way expansion is dealt with in pistons is by making them slightly out of round and also slightly tapered when cold, so they expand into shape at operating temperature. One more reason not to flog your engine until it's warmed up.
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Joined: Jun 2003
Posts: 127
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From: SLC UT
Re:Cummin's pistons
[quote author=wannadiesel link=board=8;threadid=17976;start=0#msg168628 date=1060124336]
Ditto to what Gary said. Cast iron pistons are too heavy, they went out in the '30's. Steel topped aluminum pistons have been used in some diesel designs to allow higher cylinder pressures and temperatures, but they have to run at lower speeds due to the extra weight.
The way expansion is dealt with in pistons is by making them slightly out of round and also slightly tapered when cold, so they expand into shape at operating temperature. One more reason not to flog your engine until it's warmed up.
[/quote]
Thanks I get it now
Ditto to what Gary said. Cast iron pistons are too heavy, they went out in the '30's. Steel topped aluminum pistons have been used in some diesel designs to allow higher cylinder pressures and temperatures, but they have to run at lower speeds due to the extra weight.
The way expansion is dealt with in pistons is by making them slightly out of round and also slightly tapered when cold, so they expand into shape at operating temperature. One more reason not to flog your engine until it's warmed up.
[/quote]
Thanks I get it now
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