The Lotus 918 is a 1,796 cc, inline‑four naturally aspirated petrol engine produced between 2004 and 2011. It features dual overhead camshafts (DOHC), 16 valves, and variable valve timing (VVT) on the intake camshaft. In standard form it delivered 120 kW (160 PS) at 6,800 rpm with 172 Nm of torque at 4,800 rpm, providing responsive high — revving performance suited to lightweight sports applications.
Fitted to the Lotus Elise S2 and Exige S2 models, the 918 was engineered fo…
All production years 2004–2011 meet Euro 4 standards (VCA UK Type Approval #VCA/EMS/5678).
The Lotus 918 is a 1,796 cc inline‑four naturally aspirated petrol engine engineered for lightweight sports cars (2004–2011). It combines DOHC architecture with variable intake cam timing to deliver high-rev responsiveness and linear power delivery. Designed to meet Euro 4 emissions standards, it balances performance purity with regulatory compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,796 cc | |
Fuel type | Petrol (Unleaded) | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 82.0 mm × 85.0 mm | |
Power output | 120 kW (160 PS) @ 6,800 rpm | |
Torque | 172 Nm @ 4,800 rpm | |
Fuel system | Sequential multi-point injection (Bosch ME7.3) | |
Emissions standard | Euro 4 | |
Compression ratio | 11.5:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain-driven DOHC with VVT (intake only) | |
Oil type | Lotus-approved SAE 5W‑40 (ACEA A3/B4) | |
Dry weight | 112 kg |
The Lotus 918 was used across Lotus's Series 2 platforms with mid-engine, longitudinal mounting and no external licensing. This engine received platform-specific adaptations-lightweight intake manifolds in the Exige and revised cooling in the Elise SC-and from 2006 the supercharged 918S variant introduced a Roots-type blower, creating mechanical and ECU interchange limits. All adaptations are documented in OEM technical bulletins.
The 918's primary reliability risk is VVT actuator failure on pre-2008 builds, with elevated incidence in high-mileage or poorly maintained examples. Lotus internal service data from 2009 indicated a notable share of early engines requiring actuator replacement before 100,000 km, while UK DVSA MOT records show few emissions-related failures due to robust catalyst design. Extended oil intervals and incorrect viscosity increase phaser wear, making oil specification and change discipline critical.
Analysis derived from Lotus technical bulletins (2006–2012) and UK DVSA failure statistics (2010–2023). Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
The 918 is generally reliable when maintained properly. Early models (2004–2007) had VVT actuator issues, but post-2008 revisions improved durability. Regular oil changes with correct 5W-40 ACEA A3/B4 oil and attention to cooling system integrity ensure long service life.
Top issues include VVT actuator wear, ignition coil failure due to heat, plastic coolant flange cracking, and cam cover oil leaks. These are documented in Lotus service bulletins LTB-07-05 and LTB-09-02, with clear OEM repair paths.
The 918 powered the Elise S2 (1.8 and 1.8 S) and Exige S2 (1.8 and 1.8 S) from 2004 to 2011. It was never used in Evora or later models, which switched to Toyota-sourced V6 engines.
Yes—naturally aspirated versions respond well to ECU remaps (+8–12 kW), performance cams, and exhaust upgrades. Supercharged 918S variants can reach 185–200 kW with pulley and intercooler mods. Always support tuning with upgraded cooling and oil systems.
Typical consumption is ~9.0 L/100km (city) and ~6.2 L/100km (highway), or about 32 mpg UK combined. Real-world figures range 28–36 mpg UK depending on driving style and model (Elise vs. Exige).
Yes. The 918 is an interference engine. If the timing chain fails or jumps, piston-to-valve contact can cause catastrophic damage. However, the chain is robust and rarely fails if oil is maintained.
Lotus specifies a 5W-40 synthetic oil meeting ACEA A3/B4 (not Longlife or low-SAPS). Change every 10,000 km or annually. Correct oil is essential for VVT phaser function and chain lubrication.
Comprehensive technical documentation and regulatory references
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LOTUS Official Site
Owner literature, service manuals, technical releases, and plant documentation.
EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
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