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BMW Mini Cooper
998 +20 Dished Piston With Rings & Pins - Ae Brand Single

998 +20 Dished Piston With Rings & Pins - Ae Brand Single

998 +20 Dished Piston With Rings & Pins - Ae Brand Single
Selected: 20773-20-EA
998 +20 Dished Piston With Rings & Pins - Ae Brand Single
+.020" oversize piston
Internet Price $189.95
Also used in big bore 948cc engines
Part No: 20773-20-EA
Internet Price $189.95
If you are looking for great longevity from your 998cc engine, these 4-ring dished pistons could be the best answer at rebuild time. Compression 9:1. Nural brand, circlip type.
Looking to purchase these for my 59 Bugeye. A couple of questions: - What size is the required bore for these pistons? - Can I retain the stock 948 connecting rods? - Are there any other modifications required to run with these? - Are there any suggested modifications?
Going from the 948 to the 998 +.020" should be fine.  The 948cc piston is 2.4775", the 998cc pistons are 2.5420" and 998cc +.020 =2.562". The rods are the same, the pin height for both pistons is the same (1.342").

The change represents taking a 948 block and boring it +.0845" over (from standard).

We would suggest getting larger valves in the head to take advantage of the larger displacement. If you could find a 12G206 or 12G295 head - those have larger intake valves - or just go to the large intake valves in your head. That plus more of a street camshaft and maybe a header and exhaust and you'd be good to go.

Spridget Mania Tech Team

The Spridget Parts and Accessories Experts

Related Technical Articles:
Classic Mini Cooper Pistons for High Performance or Stock page34
Created: January 03, 2019
We offer many pistons options for the Classic Mini as built from 1959 t 2000. Standard bore. Various designs and size pistons options for 998cc, 1275cc & 1380cc engines. High or low compression options includes rings and pins.
Created: September 21, 2010
The following chart shows the SAE recommended Automotive compression ring end gaps. These recommendations are followed for the majority of the ring line unless a certain application requires deviation from the chart.
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