Your Wossner piston is supplied with high performance piston rings that are specifically engineered for your
engine application. It is important to inspect the piston ring end gap during installation, and make adjustment to
the end gap if required
Inspect the piston ring end gap in your cylinder, approximately 13mm (.500”) down from the top of the cylinder.
Install one piston ring at a time, use the piston to assure the ring is flat and square to the cylinder bore. Ring gap
can be measured using a feeler gage
The chart below illustrates some typical ring end gap dimensions, based on general guidelines. To calculate the
ring end gap, multiply the cylinder bore diameter in inches X the end gap mentioned on the chart:
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Update 2-2-23
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86mm = 3.38582"
TOP RING 3.38582" x .004" = 0.0135"
BOTTOM RING 3.38582" x .005" = 0.0169"
NOTE: Piston ring oil rails should be a minimum gap of .35 – 1.0mm (.014 - .040”)
NOTE: Three piece oil ring separators should be installed with the ends butted only, and not overlapped
NOTE: Two piece oil rings require that the coil expander gap is located opposite of the rail end gap
NOTE: Top and second ring axial clearance should be between .03 - .04mm (.0011 - .0015”)
- RING END GAP.png (95.72 KiB) Viewed 7706 times
Wossner high performance pistons and rings require a break in period. It is best to follow OEM guidelines for
break in. Synthetic oils are not recommended for break in, as these oil types may prevent the piston rings from
properly wearing into the cylinder wall
TERMS AND CONDITIONS: Due to the nature of high performance and racing applications, Wossner components are sold without express warranty or any
implied warranty of merchantability or fitness for a specific purpose. Wossner shall not, under any circumstances, be liable for any specific, incidental or
consequential damages, including, but not limited to, damage, or loss of property or equipment, loss of profits or revenue(s), cost of purchased or
replacement goods, or claims of customers of the purpose, which may arise and/or shall result from sale, installation or use of these parts. Installation of
these parts may void vehicle manufacturers warranty coverage and/or may cause the vehicle to be illegal in some countries. Please check with local laws
on the road use of your vehicle. Wossner reserves the right to make product improvements and changes without incurring liability with respect to similar
products previously manufactured. By using these parts you are accepting these terms and conditions.