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Piston ring set, rings for 21253 piston
Compression ring sizes are .0591" and one piece oil ring .1181" on 21253 pistons giving 9.7cr on 1275cc. Also fits P21963 pistons as fitted to some Metro's
 
 
Question:
My 1996 mini has pistons with the following number21963 PM4 A25. I would like to get 0.010 oversized rings.
Answer:
These pistons use 2x 1.5mm rings and 1 3mm oil ring - same as the 21253 pistons - which we have rings for HERE.

They are available in STD, +.20, +.40, and +.60

Mini Mania Tech Team

The Classic Mini Parts and Accessories Experts

 
 
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Related Technical Articles:
Pistons - Mega piston performance report- Classic Mini Cooper
Created: July 14, 2005
Pistons - Mega piston performance report The two other articles I have done on this site concerned what pistons are all about, different design and construction pros and cons, material specs, ring set-ups and so on. Under 'Pistons - Favourable features for maximum performance' it would seem that th...
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