Lister J Piston Ring Set to Suit 4.25” Bore (4 Ring Set)
New high quality piston ring set to suit the Lister J petrol engines and Lister K kerosene engines with a 4.25” bore. This is a 4 ring set, and is available in 2 configurations, either with 4 compression rings, or 3 compression rings and 1 oil scraper ring. All rings have an 1/4” Axial Width. Please select set required when ordering.
Compression Ring Dimensions:
- Bore Size 4.25” (107.95mm)
- Axial Width 1/4” (6.35mm)
- Radial Wall Thickness 0.165” (4.191mm)
Oil Scraper Ring Dimensions:
- Bore Size 4.25” (107.95mm)
- Axial Width 1/4” (6.35mm)
- Radial Wall Thickness 0.155” (3.937mm)
Note: All rings will need to be gaped to suit your bore. As a general rule of thumb piston rings on vintage engines should have 0.003” of end gap per 1” of cylinder bore size (i.e. 4.25” bore would need 0.01275” end gap). Be sure to gap your rings on the smallest or unworn part of your bore, on worn or older engines that have not had a new liner fitted this would normally be towards the bottom.