Mini2 Engines (R56) and BMW R6D
Article at motoringfile.com
Juicy Highlights
- Co-developed w/ Peugeot Citroën
- to be mfg’d by Citroën
- Two Engine types
- Normally Aspirated 1.6L
- Turbocharged 1.6L
- Four output levels
- n/a 75hp, 115hp
- turbo 140hp, 170hp
- turbo 140hp version has 177lb-ft of torque at 1400rpms
- Normally Aspirated Model
- variable valve timing and lift
- acts as throttle control; butterfly valve normally open — used only as safety backup
- on demand water and oil pump
- direct fuel injection
- Turbo Model
- variable valve timing w/ sodium filled exhaust valves
- 10.5:1 compression ratio (!)
- thanks to the direct fuel injection at 120bar (~1700psi)
- twin-scroll turbocharger (!)
- 11.6psi max boost
- water/oil cooled turbocharger w/ additional water pump activated at standstill.
Interesting engine. The water pump “turbo-timer” seems pretty cool along w/ the twinscroll design, which I’ve never heard of on a turbo application.
This and the new R6 6 cylinder for the next gen. 3 series looks to be pretty cool, though I’d still say the new twin-turbo diesel is more interesting.
Cutaway pics of the twin turbo (turbine) design:
I hope they have the engine on display for a more detailed look at the L.A. show.