£73.50 exc vat
£88.20 inc vat
In stock
This piston has a possible compression ratio of 10.3:1 as fitted to Cooper RSP 1990.Engine then becomes 1310cc
Current pistons differ from the 60s originals and now have a "low drag" slipper skirt design and a shorter lighter 20.6mm wrist pin. Wrist pin height is 1.5276" to crown with a top dish of 8cc.
Performance is enhanced by the use of 3mm oil rings and the smaller drain slot behind this ring decreases the risk of breakage and 2 of 1.5 mm compression rings. Crown depth to first ring is about 10mm.
Rings are R41570-40.
AE Hepolite is now owned by Federal Mogul and trademarked "Nural"
.Now Nural stamped 87-524111-00
Sold singly,4 per engine required--equivalent type was Rover piston TAM2050 stamped AE21963 as fitted to 1990 Cooper 1275 engines.
£73.50 exc vat
£88.20 inc vat
In stockRecommended usage 4 x P21253-40 to fit one mini.
Mini Spares own Universal gasket set for solid wall blocks
For any manual block, includes gaskets for "A"Plus and pre A Plus timing covers, but is less tappet chest cover gaskets. Does not include clutch oil seal.
We now offer an en...
Mini Spares Evolution Lightweight Performance Piston. Single piston and rings.
Press fit only. Same design as C-STN103 range but different manufacturer.
The ultimate in lightweight die cast pistons, available in +.020, +.040 & +.0...
These Swiftune die cast performance pistons are part of their new Heritage range and are manufactured by global leading F1 German piston manufacturer Mahle. These pistons have been developed using their 50 plus years of experience. Glyn Swift was usi...
These Swiftune die cast performance pistons are part of their new Heritage range and are manufactured by global leading F1 German piston manufacturer Mahle. These pistons have been developed using their 50 plus years of experience. Glyn Swift was usi...
These Swiftune die cast performance pistons are part of their new Heritage range and are manufactured by global leading F1 German piston manufacturer Mahle. These pistons have been developed using their 50 plus years of experience. Glyn Swift was usi...
998cc flat top 3 ring circlip type piston set as fitted to early A plus to replace 4 ring set type. Gave 10.3 to1 CR and is a good alternative to use on any 998 with circlip type pistons. Replaced 4 ring(3 ring and scraper) P20754 from Hepolite 1980o...
998cc flat top 3 ring circlip type piston set as fitted to early A plus to replace 4 ring set type. Gave 10.3 to 1 CR and is a good alternative to use on any 998 with circlip type pistons. Replaced 4 ring (3 ring and scraper) P20754 from Hepolite 198...
Steel ring set with 3 piece oil rings as preferred by engine builders for P21253 pistons.
998cc flat top 3 ring circlip type piston set as fitted to early A plus to replace 4 ring set type. Gave 10.3 to1 CR and is a good alternative to use on any 998 with circlip type pistons. Replaced 4 ring(3 ring and scraper) P20754 from Hepolite 1980o...
60 thou oversize low drag slipper type pistons for modern day compression ratios and unleaded fuel.
Typically installation will result in a minimum 8.8:1 compression ratio but on some Metro versions it was higher.
Current pistons ...
Standard Size with 0.59" compression rings and 0.1181" oil ring for 998cc
Low drag 1275 piston standard size 2.780 (Rings included).
This piston has a possible compression ratio of 10.3:1 as fitted to Cooper RSP 1990.
The best performance 1275 pistons are C-STN100 range which have 9.73cr when the piston i...
3mm OIL RING with compression ring size .0591" (1.5mm)and one piece oil ring .1181" (3mm)on p21253 pistons giving 9.7cr on 1275cc. std ring size
For performance see steel ring set with 3 piece oil ring as favoured by engine builders[link]C1...
3mm OIL RING with compression ring size .0591" (1.5mm)and one piece oil ring .1181" (3mm)on p21253 pistons giving 9.7cr on 1275cc. 20 thou oversize
For performance see steel ring set with 3 piece oil ring as favoured by engine builders[link]...
Low drag 1275 piston standard size 2.780 plus 20 thou oversize(Rings included).
This piston has a possible compression ratio of 10.3:1 as fitted to Cooper RSP 1990.
The best performance 1275 pistons are C-STN100 range which have 9.7...
998cc dished circlip type piston with 4 rings. Compression range of 8.3 to 9:1 depending on block and head but for best performance use later 3 ring flat top piston ADU3490-20. Sold singly,4 per engine required
original pistons stamped 21963 for mini engines from 1990 on
2 x 0591" rings and oil ring .1181.
This info correct page 8 in catalogue is wrong--uses 3mm oil ring
Available at the moment but they sporadically become unavailable. Mini Spares have also had a batch of plus 60s specially commissioned to us for Grass trackers and racers. sold individually with rings and pin complete.
Ringsets are availabl...
Rover piston TAM2048 stamped 21962 with ring sizes 1.501mm and oil ring 4mm but some pistons have been stamped 21963.
-Does this get confusing?
So lets clear it up; the easy way to identify the piston and corrrect rings are as follo...
3 compression ring @ 0.625" oil ring 0.125 as per original 998 pre A plus and 1098cc versions inc morris minor and sprite range.
20 thou oversize low drag slipper type pistons for modern day compression ratios and unleaded fuel.
Typically installation will result in a minimum 8.8:1 compression ratio but on some pre 1984 Metro versions it was higher.
Current...
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