Siamese cylinders - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 40 (permalink) Old 03-28-2007, 03:25 PM Thread Starter
 
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Siamese cylinders

Sorry to start a second thread, but I want to know as much about this beast if I buy one. The fact this engine has siamese cylinders does get if it the possiblility of making it more durable or not? I don't think cooling should be a issue with these engines considering they seem to over cool anyways. But I really don't know. Just wondering what anyone else thinks of the siamese cylinders.
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post #2 of 40 (permalink) Old 03-28-2007, 04:01 PM
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what are these siamese cylinders?

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post #3 of 40 (permalink) Old 03-28-2007, 04:10 PM Thread Starter
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It's where coolant flow all the way around the cylinders because they are all connected. I don't know exactly for sure.
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post #4 of 40 (permalink) Old 03-29-2007, 01:09 AM
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You mean like in a wet liner engine, they dont have liners do they?
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post #5 of 40 (permalink) Old 03-29-2007, 01:16 AM Thread Starter
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I don't know, I'm getting really lost now.
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post #6 of 40 (permalink) Old 03-29-2007, 01:42 AM
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are wet sleeve what they use in big diesels? Now I am confused

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post #7 of 40 (permalink) Old 03-29-2007, 02:01 AM
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Quote:
Originally Posted by HighTQCummins
are wet sleeve what they use in big diesels? Now I am confused
the ISC and bigger Cummins use a steel sleeve that is pressed into the cast block making it easier to rebuild. some are wet in the fact that they create the barrier between the cylinder and the waterjacket. but there are also others that are dry and have no contact with the coolant

the 5.9 and 6.7 are what they call a parent bore engine. the cylinders are part of the blocks casting like a gasser engine.

the 5.9 has water jackets cast into the engine all the way around each cylinder and the cylinders are not connected to each other along the length of the bore.

in the 6.7, each cylinder shares metal with the adjacent cylinder making them siamesed together. with a living animal dependant of how badly they are "siamesed" , one or both would die if they were separated since they are sharing parts. The same principle applies with the 6.7. Also due the the bores being siamesed there is no way to have a water jacket separating them so there will be spots in the cylinder walls that will be hotter that other areas, which can cause distortion of the cylinder walls and a loss of compression. If this is even going to be a concern with the 6.7 is yet to be known. I bet Cummins knows but they aint gonna' tell.

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post #8 of 40 (permalink) Old 03-29-2007, 01:04 PM
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Quote:
Originally Posted by HighTQCummins
are wet sleeve what they use in big diesels? Now I am confused
Yes, wet sleeve designs are used in almost all big truck/equipment diesels. One of the smallest big truck diesels to employ them is the DT466. You can actually rebuild the engine due to liner, piston or ring failure without even pulling the motor off the mounts. You remove the pan to pull everything from the bottom and the top off right in the truck, then install new liners, pistons, rings, etc. The liners are pressed into the block

A 5.9L Cummins would have to be pulled out of the frame of the truck and "bench" rebuilt just like any gas engine since it's a parent bore diesel.
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post #9 of 40 (permalink) Old 03-29-2007, 01:29 PM
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Not related but an aluminum block 350 is one gasser that has a dry sleve configuration. I think. All I know is we have one that is apart and you can see the sleve and how it is pressed into the block. currently rebuilding the motor.

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post #10 of 40 (permalink) Old 04-03-2007, 12:53 AM
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Couldn't they rework the block so that there are no more siamese cylinders, maybe make it a little longer. How long do you think it would be until they start to notice this cyl. distortion?

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