MG 6, a model that bears the "sporting responsibility" for SAIC, is powered by a 1.5T engine, previously seen in models like the Roewe RX5 and i6. Despite its conventional hardware, this engine exhibits a distinct character when installed in the MG 6. In our tests, the MG 6 automatic transmission variant clocked an impressive 0-100km/h acceleration time of just 7.1 seconds, highlighting its sporty driving capabilities. Now, let's delve into what makes this engine tick.
The 1.5T engine, a collaboration between SAIC and General Motors, belongs to the SGE series in SAIC's powertrain lineup and is part of the blue-chip engine family, along with the MGE and NSE series. According to SAIC's product roadmap, the SGE and MGE series engines will undergo updates to their second generation between 2017 and 2021. These new engines will incorporate the Atkinson/Miller cycle operating mode and undergo optimizations in combustion control and cylinder wall friction reduction. Although the current MG 6 still runs on the first-generation engine, SAIC has announced that the second-generation engine will soon enter mass production and be featured in upcoming models.
Interestingly, while the hardware remains the same, the engine's tuning varies significantly across different models. For instance, the same 1.5T engine is tuned for comfort and off-road capability in the Roewe RX5, smoothness in the Roewe i6, and sportiness in the MG 6. This "one engine, multiple tunings" approach is a testament to SAIC's commitment to tailored experiences for each model.
Even within the same vehicle, manual and dual-clutch variants feature different engine tunings. To cater to this diverse tuning methodology, SAIC's R&D department dedicates multiple teams solely to calibration and testing. The engine's design, featuring an aluminum alloy construction and an integrated cylinder head with a water-cooled exhaust manifold, contributes to its lightweight and efficient thermal management.
The 15E4E engine boasts an average thermal efficiency of 37.5%, which is on par with most modern engines. Furthermore, its use of a centrally mounted fuel injector, a rare feature in small-displacement engines, aids in achieving efficient combustion. Complementing this, the engine also employs a small inertia turbine equipped with an electronically controlled bypass valve for quick turbo response.
In summary, this 1.5T engine, with its aluminum cylinder head and block, dual variable valve timing system, and other contemporary features, has reached the mainstream level in terms of technology. Looking ahead, the second-generation SGE 1.5T engine promises further advancements like variable valve lift and the Miller cycle working mode, potentially elevating SAIC's new models to greater heights in power and fuel efficiency.
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