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In stock
Rover piston were stamped 21963 for high compression but 21962 seems to be stamped on some from Metros customers claims. Rover only made std and 50mm.
Rover piston high compression 21963 and AE replacement was 21253 and the latest number for AE Nural is 87-524100---Does this get confusing?
So lets clear it up; the easy way to identify the piston and corrrect rings are as follows-they are made from the same piston slug with same dish but the high compression version is easily identified by the lower oil rings being 3mm wide and the top ring gap to the crown is 10mm deep.
The low compression version has 4mm oil ring and a shorter length top ring gap of about 7mm to the crown/top. The gudgeon pin is moved on production to give the higher compression ratio and lowering the rings giving a larger top ring land for strength. Rings for 3mm lower oil ring type are R41570.
if you have 4mm oil ring use R35960-00
($70.32) £70.32 exc vat
($84.38) £84.38 inc vat
In stockRecommended usage 1 x R41570-60 to fit one mini.
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...
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...
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
3 OF 0.625 COMPRESSION RINGS AND .1575 OIL CONTROL RING.
Low drag 1275 piston standard size 2.780 plus 60 thou oversize (Rings included).
This piston has a possible compression ratio of 10.3:1 as fitted to Cooper RSP 1990. The engine then becomes 1328cc
The best performance 1275 pistons a...
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. 40 thou oversize
For performance see steel ring set with 3 piece oil ring as favoured by engine builders[link]...
This is the large seal for the early type oil filter assembly pre spin on type.
You should replace the camshaft bearings every time the block goes to the machine shop. These bearings fit all late model 1275cc blocks (the ones without tappet covers on the back) It's almost too simple and thus often overlooked during a rebuild. Ca...
Set of +0.003" size 1275 crank thrust washers.
Mini Spares best quality complete gasket and seal kit for engine block and gearbox,for all common engine types and sizes.
Also comes complete with Mini Spares Evolution clutch oil seal 13H2934MS, differential oil seals...
ACL Race Bearings
ACL Race series bearings are precision manufactured to a wall thickness of ±0.0040mm giving engine builders close control of vertical oil clearance.
What is the purpose of ACL Race series bearings?
...
Race quality heavy duty double row performance endless timing chain. It is the best chain available and used by top engine builders, also fits MGB/Midget. This chain is for duplex gears that is used by racers as a limited stretch heavy duty version m...
Special superb extra strong timing chain with very limited stretch using modern day materials and technology to keep your timing correct and will fit any A series engine using a single row chain.
This chain saves all the time and effort requ...
These shouldered hexagonal con rod nuts are made by ARP in the USA and considered the best available FITS 1300 con rods plus MGB late 18V engine numbers with 11-32" bolts.Sold singly and 8 required per engine.
WASHER FOR THE OIL PRIMING HOLE PLUG WHEN APPLICABLE 850/997/998 and also on earlier type oil pressure switch or oil pressure union CAM6431.
SET OF STANDARD SIZE 1275 CRANK THRUST WASHERS
You should replace the camshaft bearings every time the block goes to the machine shop. These bearings fit all 1275cc blocks plus 970 and 1071 Cooper S. It's almost too simple and thus often overlooked during a rebuild. Camshaft bearings are pressed...
Mahle RACE quality std size main bearings for Pre A Plus 1275cc as used by competition engine builders.Quantity required-1 set.
RACE quality bearing set being made at the Mahle Motorsport Race Bearing Division Vandervell F1 plant in the UK...
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