Tata Sierra To Get New 1.5-Litre Naturally Aspirated Petrol Engine

Tata Sierra to debut new 1.5-litre NA petrol for affordable entry trims

Tata Motors is preparing to introduce a new 1.5-litre naturally aspirated (NA) petrol engine with the upcoming Tata Sierra, aimed at making the SUV’s entry-level variants more accessible and fuel-efficient. The new powerplant is derived from Tata’s upcoming 1.5-litre direct-injection turbo-petrol engine, sharing much of its underlying architecture but adopting a simpler design for cost efficiency and reliability.

While the 1.5-litre turbo-petrol showcased at the 2023 Auto Expo will power the higher-spec variants, the new NA version is expected to form the backbone of the Sierra’s sales. It will cater to buyers prioritising affordability and everyday usability over outright performance.

Mechanically, the new engine retains the same bore spacing, block, and head design as its turbocharged counterpart but swaps the turbo and direct-injection systems for port fuel injection. This helps lower production costs and improves efficiency, while also allowing Tata to offer the Sierra at a more competitive starting price.

The naturally aspirated unit is expected to deliver around 120 HP and 140 Nm, figures comparable to engines used in the Hyundai Creta, Kia Seltos and Maruti Grand Vitara. Tata engineers are reportedly focusing on achieving low NVH levels, strong fuel economy, and full E20 fuel compatibility.

In contrast, the 1.5-litre turbo-petrol engine – producing roughly 170 HP and 280 Nm – will serve as Tata’s flagship petrol motor, also powering the Harrier and Safari. It incorporates features such as variable geometry turbocharging and direct injection for stronger performance.

The Sierra will also be available with a 1.5-litre diesel engine, giving Tata a well-rounded powertrain lineup spanning efficiency-oriented petrols to performance-focused turbo units. This strategy positions Tata differently from Mahindra, which has leaned heavily into high-performance turbo engines across its portfolio.

With the new NA petrol option, the Sierra’s base variants are expected to launch at aggressive prices, potentially giving Tata a strong foothold in the midsize SUV segment. The Sierra could emerge as a key model for the brand – mirroring the impact the Nexon had in its category.