JAP Posted October 4, 2007 Share Posted October 4, 2007 When searching for a piston or piston ring the catalog indicates the brand (KS) and BR1, BR2 or BR3. What is the meaning of the BR% classification? Best regards Japanese Link to comment
Dennis Andress Posted October 4, 2007 Share Posted October 4, 2007 Well, I don't know.... But, BMW used to sell airhead pistons and cylinders with a grade of A, B, or C which referred to where they fit within the tolerance range. Link to comment
duckbubbles Posted October 4, 2007 Share Posted October 4, 2007 The best way to figure out exactly what piston/ring set you need is to look on the top of the old piston. You will have to clean off the carbon residue to find a small stamp on the head of the piston. At least that is how Mahle marked their pistons for the K100's. KS is just another vendor that BMW uses. Is that a four valver you are working on? There are production tolerances and piston/ring fit is critical for long life. The Mahle I am familiar with were marked either A or B. Since the cylinder bore of these engines really doesn't wear, you can go back with the original sizes and be good. Frank Link to comment
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