N14 Piston Ring Gap

Old 06-16-2018, 02:14 PM
Bcoday is offline
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N14 Piston Ring Gap

I'm ready to replace my pistons into my freshly honed cylinders. I have a new set of rings and I now have questions about the gap measurements. I am looking at the specs from this page but I am not 100% sure which groove is 1st and 3rd.

Is the oil groove considered groove 1 or 3?

Old 06-22-2018, 07:16 PM
Tigger2011 is offline
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Ring 1 is your top compression ring, is closest to the crown of the piston and is 1 mm thick. Ring 2 is below that one and if I remember is 1.2 mm thick. The oil ring is the bottom ring and 2.8 mm IIRC. You didn’t make mention of piston or ring brand. Usually when you buy a piston set it will include gapping instructions and are usually pretty good guidelines. I recall my CP piston gaps being tighter than those linked. 0.021 for top ring and around 0.025 for the middle ring. I’d have to dig up my notes. As a genetal rule larger gaps tend to be safer but result in more blow-by.
Old 06-23-2018, 08:19 AM
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All you did was hone the cylinders?

Are you using stock or aftermarket pistons?

When you hone a cylinder you remove more material than you think so you will need to check skirt clearances also.

Like Tigger2011 said you need to follow the specs for the pistons you purchased. If they are OEM than follow the service manual, if not contact the piston manufacture if they did not include a spec.
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