Tata Motors is preparing to make its upcoming Sierra SUV more accessible by introducing a new 1.5-litre naturally aspirated (NA) petrol engine for the entry-level variants. The new engine aims to help Tata achieve a more competitive starting price while offering refined performance, reliability, and efficiency — qualities that are crucial for success in India’s midsize SUV segment.
While the 1.5-litre direct-injection turbo-petrol showcased at the 2023 Auto Expo has received much attention, the new cost-effective NA petrol could play a bigger role in driving overall sales for the Sierra lineup.
Tata’s New 1.5-Litre NA Petrol Engine: Simpler, Efficient, and Accessible
The upcoming 1.5-litre NA petrol engine is a derivative of Tata’s new 1.5-litre turbo-petrol unit, sharing its core architecture, including bore spacing, block design, and cylinder head layout. Instead of turbocharging and direct injection, this version uses a Port Fuel Injection (PFI) setup, which prioritizes cost-effectiveness, reliability, and ease of maintenance.
Key Engineering Goals:
- Lower production and running costs
- Improved fuel efficiency and durability
- Simplified mechanical design for easier servicing
Power and torque are expected to be around 120hp and 140Nm, placing it on par with naturally aspirated 1.5-litre engines from competitors like the Hyundai Creta, Kia Seltos, and Maruti Suzuki Grand Vitara.
According to Tata engineers, the new motor will feature best-in-class NVH refinement, E20 fuel compatibility, and tuning optimized for real-world fuel economy.
Naturally Aspirated Petrol Still Dominates the Segment
Even as turbocharged engines gain traction, naturally aspirated petrol engines continue to dominate sales in the midsize SUV category.
For example, Hyundai and Kia’s 1.5-litre petrol units account for nearly 60% of Creta and Seltos sales. Buyers in this segment often prefer affordability, smooth performance, and low maintenance costs over outright power.
Recognizing this, Tata is adopting a dual-engine strategy — offering the Sierra with both a value-oriented 1.5-litre NA petrol and a performance-focused 1.5-litre turbo-petrol. This approach will allow Tata to appeal to a broader customer base, from city commuters to enthusiasts.
Tata Sierra Powertrain Lineup: Three Engine Options
When launched, the Tata Sierra will be offered with three powertrains, covering a wide range of customer needs.
| Engine Type | Displacement | Power Output | Torque | Fuel System |
|---|---|---|---|---|
| 1.5-litre NA Petrol | 1,497cc | ~120hp | ~140Nm | Port Fuel Injection |
| 1.5-litre Turbo-Petrol | 1,497cc | ~170hp | ~280Nm | Direct Injection |
| 1.5-litre Diesel | 1,497cc | ~115hp | ~260Nm | Common Rail Turbo-Diesel |
The naturally aspirated petrol engine will power the entry and mid-level trims, keeping the pricing accessible and ownership costs low. The 1.5-litre turbo-petrol and diesel variants will be reserved for higher trims, offering more performance and features.
Both petrol engines will come with manual and automatic transmission options, depending on the variant.
Balancing Performance and Efficiency
Tata’s approach differs notably from Mahindra’s strategy with its mStallion 2.0-litre turbo-petrol, which delivers segment-leading power but at the cost of fuel efficiency and higher production costs.
By contrast, Tata’s 1.5-litre NA petrol aims to deliver reliable performance, everyday efficiency, and ease of maintenance — while the turbo-petrol version caters to buyers seeking spirited performance and advanced technology.
This two-tier powertrain plan enables Tata to balance performance, economy, and pricing, giving the Sierra a competitive edge across multiple buyer segments.
Tata Sierra Launch Timeline and Expected Pricing
The Tata Sierra is expected to make its market debut later this month, with the 1.5-litre NA petrol serving as the standard engine for base variants.
The SUV is expected to be priced between Rs 14 lakh and Rs 15 lakh (ex-showroom) for the entry-level trims, making it more affordable than most turbocharged rivals. Higher-spec turbo-petrol and diesel variants could exceed Rs 20 lakh, depending on features and transmission choices.
Once launched, the Sierra will slot above the Curvv and below the Harrier, targeting buyers who want a premium midsize SUV that blends distinctive design with practicality.
Verdict: A Smart, Balanced Strategy for Tata Motors
The introduction of the 1.5-litre naturally aspirated petrol engine is a strategic masterstroke for Tata Motors. It allows the Sierra to reach a wider audience while keeping ownership costs competitive and performance adequate for everyday driving.
By offering three distinct powertrains, Tata is giving customers genuine choice — from the cost-conscious buyer to the driving enthusiast. With its modern design, flexible engine options, and emphasis on refinement, the Sierra could become Tata’s next breakthrough model in the midsize SUV space, much like the Nexon did in its segment.
checkout:Tata Sierra Entry-Level Trims to Get 1.5-Litre Naturally Aspirated Petrol Engine
