To be fair the mpi engine was developed by rover engineers
BMW only put the money and their 'quality control'
There is a good write up on the 'The Last Mini's' website about the BMW Years of the classic Mini and the MPi development story (see link below).
"Ever-tightening EU regulations were plotting to kill the Mini. In order for it to survive, it would need to be refined and redeveloped in a number of ways - all of which had previously been considered too expensive and too complex an engineering feat to be worthwhile. Now though, with BMW & Pischetsrieder at the helm, the outcome was likely to be very different indeed. If his plan to launch a successor to Issigonis' original was to succeed, he would not only need Rover's Longbridge plant to keep producing the almost 40 year-old design until the new car was ready, but to complete the work of former boss Graham Day and fully re-discover the Mini's long-lost mojo.
Rover's engineers had a tough task ahead of them, then. Lowering emissions, reducing noise and boosting safety were all on the agenda, while the designers were faced with the considerable challenge of reinstating the Mini's once-enviable reputation as a fashion must-have."
Read on to find out how they did it:-
http://www.thelastmi...chapter-ii.html
Edited by mab01uk, 29 December 2015 - 03:19 PM.