The new 1.4-litre CRDi engine is built on the same basic architecture of the existing 1.5-litre CRDi VGT. However, the new 1.4 CRDi has a few more technologies tucked away under its timing belt. Hyundai's focus with the new engine has been to keep its fuel efficiency at an optimum, without affecting its performance.
The new 1,396cc, DOHC, common-rail engine manages to best the class with its peak power of 90 PS, which also gives it a class leading power-to-weight ratio. While the new engine has the inherent advantages that the common rail injection system offers, Hyundai engineers have also added a couple of more features to reduce engine noise and vibratio
n, including a roller swing arm and a hydraulic lash adjustor for consistent value performance.
Both the components go on to reduce tappet noise and improve engine performance, ensuring that the valve opening and clearance is automatically adjusted for any changes that may otherwise be caused due to wear and tear.
The new 1.4 CRDi also features a swirl control valve that has been located in the intake manifold for improved air-fuel mix. By increasing the level of air swirl, the fuel mixture is more consistent (instead of being richer or leaner in parts).
This helps improve combustion and reduces emissions, particularly NOx (Nitrogen oxide). The feature is a first in the segment.
The i20's 1.4 CRDi also employs a exhaust gas recirculation (EGR) system to reduce pollution levels to within Euro IV levels.
In the place of a regular mechanical EGR system, this engine has been given an electrical EGR valve and a liquid cooling mechanism that enables a richer mixture to be passed into the intake manifold, leading to better combustion and lower maintenance.
Working in tandem with the EGR system is a Lambda sensor that tracks the air-fuel mixture ratio in the exhaust.
It feeds the information to the engine's electronic control unit (ECU) which in turn optimises the duration of fuel injection to ensure that excess unburnt fuel in the engine doesn't lead to higher emissions and lower fuel efficiency.
Thanks to the loads of torque they offer, small diesels are inherently more driveable than similarly sized petrol engines and you don't have to worry about them guzzling fuel either.
With a peak torque of about 240Nm starting all the way from 1,750 rpm, the new i20 CRDi also tops the segment in this parameter.
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