SAIC Kavachi engine
The Kavachi engine, commonly known as the TCI-Tech, was developed by SAIC Motor, based on a re-engineering of the Rover K-series engine. It is used in Roewe and MG Motor vehicles. The 1796cc Kavachi engine is produced in two versions, a naturally aspirated producing  at 6,000 rpm and  @ 4,500 rpm, and a turbocharged version producing  at 5,500 rpm and  of torque from 2,500 to 4,500 rpm. It is Drive-by-wire. UK engineering firm Ricardo plc were tasked with remedying the well known faults of the K series by SAIC Motor for its introduction into the Chinese marketplace. With a redesigned head, improved waterways, stiffened block as well as changing the manufacturing process and quality of material, the Kavachi is seen as the pinnacle of K-series development. As of 2015, with more than half a decade in the market, there have been no reported issues of head gasket failure on cars using the Kavachi engine. A point to note, the Kavachi engine is sometimes referred to and often confused with the N Series engine. The N Series is also a development of the original K Series but was in fact produced by Nanjing Automobile (NAC) a rival company at the time to SAIC. (later merged)

N Series was fitted into the relaunched MG TF in the UK and in the MG3 SW and MG7 in China. Fixed the well known Head gasket issues associated with the MG Rover K series engine. Applications
 
 2008–2014 Roewe 550/MG 550
 2008–2016 Roewe 750/MG 750
 2009–2017 MG 6
 2011–2015 Roewe W5

References

Roewe 550 Specs

Roewe
Straight-four engines
Automobile engines