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Toyota unveils two new small capacity engines for its 2015 lineup

Snapshot: Toyota introduces two new small-capacity engines that will power the Toyota cars from 2015

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Toyota has unveiled two new engines that will power the company's future range of passenger vehicles. The new small-sized power plants are more efficient as much as by 30 per cent over the current generation engines of the same capacity, thanks to the employment of technicalities derived from modern hybrid technology. The new powerplants will propel the Toyota cars from 2015 in 14 different variations as per the market and model demands accordingly.

The company has focused on increasing the thermal efficiency of new engines. There's a simple rule to understand it - more the thermal efficient an engine is, the more efficient it will be. The company states that the new engine will have a maximum thermal efficiency of 38 per cent, benchmark among mass-produced engines.

One of the two new engines is a 1.3-litre petrol mill that is based on the Atkinson cycle, a combustion cycle found on hybrid engines generally to improve the efficiency. Employment of the Atkinson cycle increased the expansion ratio of the engine while reducing the wastage of heat with high compression ratio of 13.5:1. This resulted in high thermal efficiency thus making the new engine efficient by atleast 10 per cent over its antecedent.

To boost the efficiency further, Toyota has utilised other innovations including an intake port with a new shape that generates a strong tumble flow (whereby the air-fuel mixture flows in a vertical swirl) inside the cylinder, and a cooled exhaust gas recirculation (EGR) system paired with Variable Valve Timing-intelligent Electric (VVT-iE) technology to improve combustion and reduce energy loss.

The second of the two is the tiny 1.0-litre engine developed in collaboration with Daihatsu while incorporating the same tumble flow, cooled EGR system and VVT-iE technology. Toyota claims this new engine to be upto 30 per cent more efficient compared to current generation engine of same capacity.



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