Tata Motors displayed an array of different engines at the 2014 Auto Expo including a 3.8 SGI (Sequential Gas Injection) TCIC CNG engine, 5-litre CNG + diesel engine and an 800 cc, two-cylinder turbocharged diesel engine while focussing on environmental friendliness and cleaner power-trains.

Now it has been learnt engineers at Tata have also developed a new four-cylinder, 3-litre CRDI diesel engine but the applications of this new oil-burner are still uncertain.

There is a possibility the company will replace the older 3-litre diesel engine with this new unit.

Tata has aimed at greater fuel efficiency and lower weight to comply with stricter emission norms while developing the new engine.

The power-plant also includes scope for EGR (Exhaust Gas Recirculation) mounts and the air intake manifolds are designed for mounting EGR systems.

The new engine is still under development and the company is testing its prototype for durability.

No decisions have been made on the engine's applications as well as production and commercialisation process.

Tata already has a four-cylinder, 3-litre diesel power-train in its kitty. That particular engine is used on the RX pick-up, EX pick-up, EX crew-cab and EX Dicor BSIV.

It also powers the Xenon and Sumo Gold while its BSIII avatar is plonked in the 407 series of trucks.

Officials from Tata Motors have said they will continue working on a broad spectrum of technologies but do not comment on future products.

Maximum power and torque outputs of the new diesel engine are not yet known.