Sunday, November 15, 2020

Here's why X50 3-cylinder enginer is better than 4

 Geely-Volvo’s CEVT engine boss explains why the Proton X50’s 3-cylinder is better than a 4-cylinder

Removing one cylinder is also a super effective in cutting down weight, which is directly related to fuel consumption and exhaust emissions. There’s also the added benefit of achieving better front:rear weight balance in front-wheel drive cars, which is the norm these days anyway.

The benefits of a 3-cylinder over a 4 is very clear. The challenge is to mitigate the vibration problems from a 3-cylinder’s uneven firing order. Solving it is complex, but not difficult if you know what you are doing. Technology for dampers and today’s understanding of engine harmonics is good enough to allow car companies to overcome the problem.

The Geely 1.5TD engine, which Malaysians know as the 1.5 TGDi (identical to 1.5 MPI except for fuel system), contains many of such countermeasures into its engine design.

Explaining them requires a Ph.D but Sandquist briefly said the use of counterweighted crankshafts, dual mass flywheel with centrifugal pendulum absorber damper, single balancing shaft, low noise timing belt, high stiffness oil pan, asymmetric oil pump impeller, engine compartment and vibration dampener – all hidden away from view, allows the 3-cylinder to run very smoothly.

Dr Sandquist adds that vibration (lack of) of the 1.5TD engine is not only controlled, but it’s actually better than some of their rivals’ 4-cylinder engines...

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