[By: MAN Energy Solutions]
MAN Energy Solutions has announced a new generation of its Common Rail injection system for its medium-speed, four-stroke portfolio. The CR 2.2 common-rail fuel-injection system will eventually completely replace its CR 1.6 predecessor and builds on its experience, allowing a very precise and flexible control of injection pressure, timing, and duration throughout engines’ entire operating ranges. Engine performance, emissions and fuel consumption can be optimised accordingly.
Stefan Eefting, Senior Vice President and Head of MAN PrimeServ Germany, said: “This new common-rail generation integrates the experience and lessons learned from the previous CR generation. A key development is that we have reduced our dependency on subsuppliers and brought production completely in-house, which – in dispensing with external partners – greatly simplifies the technical side of things for us. The result is a proven, modular system that can easily be adapted to different engine sizes and that I’m positive will be well-received by the market.”
The new CR 2.2 generation is based on the CR 1.6’s extensive field experience running over 17 years on over 500 engines and 5,000 cylinders, representing more than 17,800,000 accumulated operating hours in different applications and fuels. Its core components comprise an optimised and uniform high-pressure pump and a newly developed injector, integrating the CR 1.6 valve group and making the entire system setup more coherent. It is initially being introduced via the MAN 49/60DF engine.
MAN Energy Solutions reports that CR 2.2 can boast of up to 38% increased rail-pressure for all applications, and over 33% increased target time-between-overhaul intervals for most components. The CR 2.2 system features some 35% fewer high-pressure connections, meaning a significantly reduced risk of leakages and greater service-friendliness.
Alexander Knafl, Senior Vice President, Head of Engineering R&D Four-Stroke, MAN Energy Solutions, said: “Common-rail 2.2 brings multiple benefits for engines and engine performance, including reductions in fuel consumption, emissions, vibrations and noise. In general, it offers improved performance and increased robustness compared to its predecessor and has already successfully accumulated over 30,000 engine test hours running on DMA and HFO.”
Other features of common-rail 2.2 include:
