ok, i got my pistons and rings in the other day, and i went to gap my rings and well the measurements that i used on my je rings were to small. in other words the gap that was already there was bigger then my filed down je gap. the top ring gap is .019 (.483mm) and the second ring gap is .20 (.508mm). what i need to know is if thats ok to run with, or if its to big.

 

Different brands of rings will require different gap specs. Your piston rings should have come with a spec sheet.

 

the only spec sheet they came with was one saying, the suggested gap is .004 of the cylinder bore in inches

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by turbodohcsi &raquo;</TD></TR><TR><TD CLASS="quote">the only spec sheet they came with was one saying, the suggested gap is .004 of the cylinder bore in inches
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Then that is what you should use. The top ring will usually have a different gap then the bottom ring too. It didn't have different specs for each?

 

nope, "recommended end gap is usually .004" per inch of bore for top and second rings" quoted from wiseco's paper they sent.

and well using their equation it come ups to .012 gap. well thats just a LITTLE smaller the .019, or .020

 

The rings are already gapped wider than .012?

 

yeah, top is gapped at .019, and the second is gappped at .020. damn, im abot to exceed my posting limit. stock bore, just honed out.

 

You should call Wiseco, you may need to get new rings. If you are building for forced induction you may actaully be fine with the larger gap though, usually extra clearance is recommended for turbo. Also make sure you are measuring the gap with the ring pushed down in the bore and perfectly level all the way around. I think it's supposed to be measured an inch down the bore.

 

yeah, ive done all that. and wiseco is closed today

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by turbodohcsi &raquo;</TD></TR><TR><TD CLASS="quote">yeah, ive done all that. and wiseco is closed today</TD></TR></TABLE>

I would say you'd be fine with the little bit of extra clearance. The worst that will happen is you'll lose a tiny amount of compression.

 

You can use a piston to line up the ring in the bore to take your measurements also.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by t04ecvc &raquo;</TD></TR><TR><TD CLASS="quote">You can use a piston to line up the ring in the bore to take your measurements also.</TD></TR></TABLE>


That's what I usually do.

 

thats also what i do, and what i did, but anyways back to the question.

 

Don't know about Wiseco's, but that's perfect for CP pistons.

CP
top ring: 0.017-0.021"
bottom ring: 0.02 to 0.024".

81.5mm bore.

But anyways, .07 clearance is a lot. .012 to .019 is a big difference.

 

I set a dial caliper to the depth I want the ring to sit at, place the ring in, and level out the ring with the caliper (especially the ends).

If the ends aren't parallel, it can increase the measured clearance by a thousandth or two.

 

mine is stock bore, so would the cp suggestions still be right?

 

still need help