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Old April 3rd, 2013, 03:12 PM   #1
cuong-nutz
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Engine builders: piston ring gap size

What gap sizes are you using for your rings? I'm measuring .014" (0.356 mm) for my top and .020" (0.508 mm) for my second ring. I'm using Wiseco 12.5:1 +2mm pistons and rings.

1. Does it matter where you measure your ring gap in respect to position inside the cylinder?

2. Are you using Kawasaki spec ring gaps or piston manufacturer's?

Kawi specs:

Piston Ring End Gap
Standard:
Top 0.15 ∼ 0.30 mm (0.0059 ∼ 0.0118 in.)
Second 0.40 ∼ 0.55 mm (0.0157 ∼ 0.0217 in.)
Oil 0.20 ∼ 0.80 mm (0.0079 ∼ 0.0315 in.)

According to Wiseco's table of ring gap for high performance street:

64mm/25.4 = ~2.52" x 0.0040 = 0.0113" top ring
~2.52" x 0.0055 = 0.01386" bottom

From the measurements I got, I am way off. What's the deal? I measured both ring sets that came with the piston at the top of the cylinder using the piston to square the ring in the cylinder.
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Old April 3rd, 2013, 04:00 PM   #2
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This is the sheet that JE uses.
http://www.jepistons.com/PDFs/TechCo...instrc4032.pdf

Are you doing the conversion to inch? 64mm x .0050 in my case is .012.

What is your bore size? and what did you get?
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Old April 3rd, 2013, 11:16 PM   #3
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Quote:
Originally Posted by Racer x View Post
This is the sheet that JE uses.
http://www.jepistons.com/PDFs/TechCo...instrc4032.pdf

Are you doing the conversion to inch? 64mm x .0050 in my case is .012.

What is your bore size? and what did you get?
Yes, I'm using the conversion from metric to inch and then multiplying it by the min bore clearance.

http://www.aa1car.com/library/ringendgap_wiseco.pdf
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Old April 4th, 2013, 03:41 AM   #4
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So you should have 12 top and 13 bottom and you have 20 bottom.

You should measure top center and bottom like you said,using the piston to square them up.
Better call them and ask .
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Old April 8th, 2013, 01:09 PM   #5
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Well just got off the phone with them and one of the tech said it's fine but I am really skeptical.

Why would they spec one size and then say running bigger is fine when the measurements are way off their table of gaps.

Edit: Going to check the part # of the rings when I get home to make sure I have the right ones.
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Old April 10th, 2013, 07:52 AM   #6
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I got an email from one of their techs:

Quote:
Actually the rings are still in spec. The XC style rings have the gaps
built larger so as to be a non file set. The top ring can go out to .016
and the second ring can go out to .024 and still be in spec.. The top
ring usually comes through at about .012 and the second ring comes
through .019-.021. You will not have any issues.

Regards,

Alan Pizzino
Technical Sales
Wiseco Performance Products
440-497-3105
It was really great to see this email!
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Old April 10th, 2013, 09:06 AM   #7
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The piston makers are very responsive to questions and are very helpful.
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