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ecardlr`s glossary / car dictionary decodes difficult car terms for you.

Most car features/specifications are difficult to understand. ecardlr car glossary is an attempt to demystify these difficult to understand car terms for every car buyer. A must read for all those new car buyers, who want to make an informed new car choice.
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Vehicle performance is dependent on its heart (engine) which rest under its hood. Not only is the engine supposed to deliver above par performance amongst cars in its categories, but it also has to ensure that it does so with utmost frugality and least damage to the environment. No wonder major chunk of R&D expenses of almost all car manufacturers is focused on their power train technology up gradation.

These developments are showcased by car manufacturers at auto expo’s worldover to garner maximum exposure for their new development. 11th auto expo held in New Delhi likewise witnessed power train capabilities of various car manufacturers, be it; Ford’s Eco boost, Renault’s 1.5 dCi, VW Blue Technology and Tata’s 3 Cylinder E. Hyundai too used this opportunity to showcase its very competent GDi Theta II engine which will be doing its duty under the soon to be launched New Sonata. A tech which brought alive Hyundai’s growing strength and confidence in the automobile world. Here’s our understanding of the same and we would appreciate if you could add more to it.

GDi - GASOLINE DIRECT INJECTION) TECHNOLOGY

GDi is acronym for “Gasoline Direct Injection” and this is the technology used by Hyundai in their Theta II engines. Theta II is available in top end models of Hyundai like; Sonata and Santa Fe.

GDi technology innovations are focused on optimizing the tradeoff between performance and fuel efficiency (mileage). The same is managed through an increased compression ratio, variable valve timing and variable induction system. Whilst increased compression ratio helps in squeezing out more performance, variable system intake helps in better breathing of the engine. Increased compression ratio also helps in reducing any knocking phenomenon. Theta II engine pre-cools the charge prior to its entry into the combustion chamber, this helps in reducing the knocking phenomena.

GDi employs direct injection mechanism which delivers the charge directly into the combustion chamber through individual injectors located above each cylinder. The variable intake manifold increases the air flow at slow speed and makes it flow seamlessly at higher engine speeds. Variable valve timing alters the timing of inlet and outlet valves openings, but unlike Honda, lift depth is not altered.

Reduced emission is a result of two-phase ignition provision in Theta II engines. Phase I is the pilot injection before the actual compression stroke commences and then rest of fuel is delivered at the end of compression stroke; thereby delaying the ignition timing. This split ignition design reduces the load on the catalyst thus resulting in lower emissions than the conventional engine. In fact this split design of ignition helps the catalyst to achieve its optimum temperature faster and reduces emission by as much as 30%. Friction and weight in the new engine is reduced by around 10 pounds over its outgoing power train.

Theta II engines are available with the capacity of 2.0 L & 2.4 L. Maximum power figures are 165 Ps & 178 Ps while torque stands at 198 & 229 Nm for 2.0 L & 2.4 L respectively.
 
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