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Old 11-30-2008, 01:51 PM   #1 (permalink)
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Question Pistons!!

Ive been looking at changing the pistons for my 1993 12 valve.Is the piston the same bore as the 2nd gen 12 valve or not??? What the difference it getting pistons coated V.S. just a new set from a cummins 2nd cummins?? My cpl# is 1549. Any input or just witch way to go would be helpful.
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Old 11-30-2008, 01:58 PM   #2 (permalink)
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they are the same bore as the 12v but the rings are different, i cant remember if theres more or if there is a different spacing. cummins pistons are good, IMO getting them coated is really for pretty high performance applications from my understanding
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Old 11-30-2008, 02:32 PM   #3 (permalink)
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Shouldnt have an issue using the newer syle pistons, Its one of the few minor things that change for application and years, the block is the same.

I would also suggest using pistons from cummins, as far as coating goes, i wouldnt be too concerned about it. The OEM pistons last forever as it is. Also, cummins alos sells different grade of pistons (gade a/b/c), not too sure what the differences are though...

2nd gen piston kits (std bore)

3802561 grade a
3802562 grade b
3802563 grade c

They also have .5 and 1mm oversize available
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Old 11-30-2008, 07:50 PM   #4 (permalink)
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The Grading has to do with piston protrusion above the surface of the block..... It's covered in the service manual....... I'm told that it's really not all that necessary...... It's only the automotive apps that do that anyway....
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