According to ex-Rover Development Engineers they used several (R3) Rover 200's to test and develop the (R50/53) MINI and Cooper 'S' engines, steering and running gear.....the supercharged 'S' Rover 200 'test mules' used to 'fly' around the Gaydon test track and the local road test routes around Longbridge but were really early MINI prototypes 'undercover' as Rover 200's in order to avoid the international motoring press photographers eager to get 'scoop' photos of a pre-production MINI on the road.
Not fitting the K Series engine remains a bit of a mystery......in the book 'New MINI' by Graham Robson it seems the oficial line from both Rover and BMW was that it was too wide with the R65 Rover Midland gearbox across the engine bay (although it was earlier shoehorned into the 2" wider classic Minki project for Rover and BMW to test feasibility). The hidden agenda suggested in the book may have been the reliability concerns as suffered later by Ford with the warranty claims on the early K-Series Land Rover Freelanders. The brand new 1.6 /1.4 Chrysler Tritec engine was already on course to go into production for early 2001 and needed only 300 workers in a new factory in Brazil to produce 250,000 engines a year. Two classic Mini's were exported to Chrysler in the USA so engineers could see what the driving/engine characteristics of the Mini were all about and how a similar modern MINI version was wanted, also all the ancillaries had to be moved to the front face of the cast iron block to gain the necessary crash/crush space behind the engine when fitted in a MINI. BMW also wanted to add variable valve timing but Chrysler declined to add it on development time and cost grounds. The first Tritec prototypes were up and running in UK Rover built test car mules by early 1998. The first MINI test mules used Rover 200 (R3) bodys reduced in weight to the target weight of the MINI and with much extra stiffness added by full roll cages to match the MINI's proposed ultra stiff bodyshell needed for ultimate handling in its class. Although Rover did not get to fit the 'K' Series engine to the R50 MINI the Rover Midland gearbox did make it into the production R50 MINI ONE and Cooper up until the mid-2004 facelift when (like the R53 Cooper S from launch) a stronger Getrag box was fitted to the range due to many gearbox failures under warranty........
When Chrysler later merged with BMW's arch rival Mercedes (for a few years)....a new MINI engine had to be found and was jointly developed with Peugeot for the Mk2 R56 MINI. The latest F56 Mk3 MINI range have all new BMW developed 3 & 4 cylinder engines built at the Hams Hall factory in Birmingham.
Although the R50 MINI One/Cooper and R53 MINI Cooper S were designed and developed by Rover Engineers at Gaydon and Longbridge and funded by BMW....engineers from BMW Munich only got more deeply involved in the later pre-launch stages in 2001, mainly with upgrading the quality control spec as the sudden decision for BMW to split with MG Rover and keep the new MINI meant the R50/53 MINI was now to be sold from alongside BMW showrooms rather than through Rover dealers.
ie. BMW were now more worried about their quality reputation and warranty claims......
Edited by mab01uk, 14 July 2018 - 01:41 PM.