The Renault K4J 730 is a 1,390 cc, inline‑four naturally aspirated petrol engine produced between 1996 and 2008. It features a DOHC, 16‑valve design with multi‑point fuel injection, delivering responsive performance for its class. Its lightweight aluminium block construction prioritised efficiency and refinement, making it suitable for compact city cars and superminis.
Fitted primarily to the Clio II, Twingo II, and Modus platforms, the K4J 730 was engineered for a…
Production years 1996–2000 meet Euro 2 standards; 2001–2008 models meet Euro 3 standards (VCA UK Type Approval #VCA/EMS/K4J).
The Renault K4J 730 is a 1,390 cc inline‑four naturally aspirated petrol engineered for compact hatchbacks and city cars (1996-2008). It combines dual overhead camshafts with multi-point fuel injection to deliver lively throttle response and efficient operation. Designed to meet evolving Euro 2 and Euro 3 emissions standards, it balances urban agility with everyday reliability.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,390 cc | |
Fuel type | Petrol | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 75.8 mm × 77.0 mm | |
Power output | 70 kW (95 PS) @ 5,500 rpm | |
Torque | 128 Nm @ 3,000 rpm | |
Fuel system | Siemens Sirius 32 multi-point injection | |
Emissions standard | Euro 2 (pre-2001); Euro 3 (2001–2008) | |
Compression ratio | 9.8:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Belt‑driven camshafts | |
Oil type | Synthetic 5W‑40 (ACEA A3/B4) | |
Dry weight | Not available in source documentation |
The Renault K4J 730 was used across Renault's Clio II/Twingo II platforms with transverse mounting and no external licensing. This engine received minor platform-specific adaptations—revised engine mounts for the Modus—and from 2001 the introduction of EOBD-compliant ECUs, creating diagnostic tool compatibility limits. All adaptations are documented in OEM technical bulletins.
The K4J 730's primary reliability risk is exhaust camshaft lobe wear, with elevated incidence in vehicles subjected to frequent short trips or neglected oil changes. Renault internal service data indicated this was a leading cause of top-end rebuilds for high-mileage examples, while its simple belt-driven design otherwise proved very durable. Maintaining correct oil specification and change intervals is paramount to preventing this critical failure.
Analysis derived from Renault technical bulletins (1999-2008) and internal service reports. Repair procedures should follow manufacturer guidelines.
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The K4J 730 is generally reliable with proper maintenance. Its main long-term risks are exhaust camshaft wear (mitigated by strict oil changes) and timing belt failure. With synthetic 5W-40 oil changed every 10,000 km and the timing belt replaced at 60,000 km, these engines can achieve high mileages. Neglecting these items is the primary cause of major failures.
The most critical issue is exhaust camshaft lobe wear, often following neglected oil changes. Other common problems include timing belt failure if not replaced on schedule, ignition coil pack failures causing misfires, and throttle body carbon buildup leading to idle issues. These are well-documented in Renault service literature.
The K4J 730 engine was fitted to several Renault models, primarily the Clio II (1998-2005), the Twingo II (2007-2008), and the Modus (2004-2008). It was used exclusively in the 1.4 16V petrol variants across these platforms.
Moderate power gains are possible. An ECU remap can yield +5-10 kW safely, as the bottom end is robust. Intake and exhaust modifications can complement this. Significant forced induction is not advisable without internal upgrades, as the stock internals and fuel system have limited headroom. Reliability should be prioritized over peak power.
Fuel economy is good for a 1.4L 16V petrol. Expect figures around 6.5–7.5 L/100km (38–43 mpg UK) in combined driving for a Clio II. Real-world consumption is heavily influenced by driving style, vehicle weight, and condition. Highway cruising can return figures closer to 5.5 L/100km (51 mpg UK).
Yes. The K4J 730 is an interference engine. If the timing belt fails or jumps teeth, the pistons will collide with the open valves, causing severe internal damage that typically requires a cylinder head rebuild or engine replacement. Adhering to the 60,000 km replacement interval is non-negotiable.
Renault specifies a fully synthetic 5W-40 engine oil meeting ACEA A3/B4 specifications for the K4J 730. Using lower-quality mineral oils or extending change intervals significantly increases the risk of camshaft lobe wear. Regular oil changes (every 10,000 km) are crucial for long-term reliability.
Comprehensive technical documentation and regulatory references
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RENAULT Official Site
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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
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