<Tr> <Th> 1275 cc </Th> <Td> 70.6 mm </Td> <Td> 81.28 mm </Td> <Td> 10.5: 1 </Td> <Td> MEMS Multi Point Injection </Td> <Td> 64 PS (47 kW; 63 hp) </Td> <Td> 5500 </Td> <Td> 70 lb ⋅ ft (95 N ⋅ m) </Td> <Td> 3000 </Td> </Tr> <P> British Leyland was keen to update the old A-series design in the 1970s . However, attempts at replacement, including an aborted early - 70s Rover K engine and an OHC version of the A series, ended in failure . During the development of what would become the Austin Metro, engineers tested the A series against its more modern rivals and found that it still offered competitive (or even class - leading) fuel economy and torque for its size . While in the 1970s the A series had begun to seem dated against a new generation of high - revving overhead cam engines, by the end of the decade a new emphasis on good economy and high torque outputs at low speeds meant that the A series's inherent design was still well up to market demands . </P> <P> Given this, and the lack of funds to develop an all - new power unit, it was decided to upgrade the A-series unit at a cost of £ 30 million . The result was the' A-Plus' Series of engines . Available in 998cc and 1275cc, the A-Plus had stronger engine blocks and cranks, lighter pistons and improved piston rings, Spring loaded tensioner units for the timing chain and other detail changes to increase the service interval of the engine (from 6,000 to 12,000 miles). More modern SU carburettors and revised manifold designs allowed for small improvements in power without any decrease in torque or fuel economy . Many of the improvements learnt from the Cooper - tuned units were also incorporated, with A-Plus engines having a generally higher standard of metallurgy on all units, where previously only the highest - tuned engines were upgraded in this way . This made the A-Plus engines generally longer - lived than the standard A series, which had a life between major rebuilds of around 80,000 to 100,000 miles in normal service . Studies were made into upgrading the engine to use five main crankshaft bearings but the standard three - bearing crank had proven reliable even in high states of tune and at high engines speeds, so it was not deemed worth the extra funding . </P> <P> The new engines received distinctive' A +' branding on their rocker covers and the blocks and heads were colour - coded for the different capacities: yellow for 998 cc and red for 1275 cc engines . </P>

Difference between a series and a plus engine
find me the text answering this question