April 3rd, 2013, 03:12 PM | #1 |
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Name: Cuong
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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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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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April 3rd, 2013, 11:16 PM | #3 | |
RIP Alex
Name: Cuong
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Quote:
http://www.aa1car.com/library/ringendgap_wiseco.pdf
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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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April 8th, 2013, 01:09 PM | #5 |
RIP Alex
Name: Cuong
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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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April 10th, 2013, 07:52 AM | #6 | |
RIP Alex
Name: Cuong
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I got an email from one of their techs:
Quote:
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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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