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Im rebuilding a d16z6. I ordered PM6 pistons and they sent me PM3 pistons which wont work.

I decided to use the original P28 pistons that came with the engine with new rings. The cylinders were honed. Only problem is that the guy didn't mark which cylinder they came out of.

How important is it that they go in the same cylinder they came out of? What could potentially go wrong and is there anyway to figure out which piston came from which cylinder?

Thanks in advance. I appreciate it.
 

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\/Your Mom Was Here\/
Vibe GT
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4,833 Posts
It shouldn't matter unless these are forged pistons with intentions to turbo, then usually the machinest will match the cylinder to each individual piston.
 

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Meat Popsicle
91 CRX Si
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2,942 Posts
As far as I know the factory doesn't bore each cylinder to a specific piston. The OEM pistons and bores should all be within a certain tolerance which will allow the correct P2W clearances.

Unless there are some unusual wear marks on the pistons , I wouldn't worry about it.
 

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BATSLOMAN GIVES NO FUCKS.
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if its been bored and honed and youre going with new bearings and rings, it doesn't matter. the real question is, with it being bored and honed, will the oem sized pistons fit without slap
 

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Brokedick Millionaire
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40,665 Posts
check the rod caps to see if they were numbered.
 

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Integra DB9, Accord Type R
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As far as I know the factory doesn't bore each cylinder to a specific piston. The OEM pistons and bores should all be within a certain tolerance which will allow the correct P2W clearances.

Unless there are some unusual wear marks on the pistons , I wouldn't worry about it.
Agreed.

I don't know of a volume engine manufacturer that would match pistons and bores to this degree. I believe that there's an element of selection in building some Type R engines (eg: the H22A7), but design tolerances work well enough for most 'ordinary' cars.

If the pistons and bores are within spec for diameter and, as Paterico says, there aren't unusual marks in the bore, you should be OK. It's worth checking the diameters in a few places around the periphery and lengths to make sure roundness and cylindricity are also OK.

The rings will help, too.
 

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97 EJ6 boosted D16Z6
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Brokedick Millionaire
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yes, its the other end that's critical in this case:bandito:
The rods will have the OEM size codes for bearings, but people also make the location with a paint pen or such.
 
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