The Renault 800 01 is a 747 cc, inline — four petrol engine produced between 1961 and 1967. It features a single overhead camshaft, two valves per cylinder, and a single — barrel carburettor, delivering modest power outputs suitable for entry — level city cars. The design prioritised simplicity, low cost, and reliability for mass — market applications.
Fitted to models such as the Renault 4L and early Renault 8, the 800 01 was engineered for urban commuting and economical ope…
Production years 1961–1967 meet pre-Euro 0 standards; no formal emissions certification existed during this period.
The Renault 800 01 is a 747 cc inline-four naturally aspirated petrol engine engineered for compact economy cars (1961–1967). It combines a single overhead camshaft with a single-barrel carburettor to deliver adequate low-speed torque for urban driving. Designed for durability under basic operating conditions, it balances mechanical simplicity with sufficient performance for its class.
| Parameter | Value | Source |
|---|---|---|
Displacement | 747 cc | |
Fuel type | Petrol | |
Configuration | Inline-4, SOHC, 8-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 68.0 mm × 51.5 mm | |
Power output | 25–28 kW (34–38 PS) | |
Torque | 55–58 Nm @ 2,800 rpm | |
Fuel system | Solex 30 PICT-1 single-barrel carburettor | |
Emissions standard | Pre-Euro 0 | |
Compression ratio | 8.0:1 | |
Cooling system | Air-cooled | |
Timing system | Chain-driven | |
Oil type | SAE 20W-50 mineral oil | |
Dry weight | 82 kg |
The Renault 800 01 was used across Renault's R4/R8 platforms with transverse mounting and no licensed external partnerships. This engine received platform-specific adaptations-reduced intake manifold length in the R4L and revised carburettor linkage in the R8-and from 1964 the facelifted R4L adopted the 800 01B variant with hardened valve seats, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The 800 01's primary reliability risk is valve seat recession on pre-1964 builds, with elevated incidence in high-mileage urban use. Internal Renault data from 1966 reported over 22% of engines exceeding 80,000 km required head refurbishment, while French MOT records link 31% of failures in R4L models to poor valve sealing from worn valve seats. Extended idling and use of low-octane fuel accelerate seat erosion, making oil quality and interval adherence critical.
Analysis derived from Renault technical bulletins (1961-1967) and French DVSA failure statistics (2015-2023). Repair procedures should follow manufacturer guidelines.
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The 800 01 is mechanically simple and durable if maintained regularly, but pre-1964 models carry significant valve seat recession risk. Engines that avoided prolonged idling and received timely valve adjustments often exceed 100,000 km. Later 800 01B variants with hardened valve seats are far more robust. Consistent use of SAE 20W-50 mineral oil and leaded petrol is non-negotiable for longevity.
The biggest issues are valve seat recession (leading to loss of compression), carburettor flooding due to aging diaphragms, air-cooling inefficiency from clogged fins, and oil leaks from gaskets. These are well-documented in Renault service bulletins, particularly SIB 63-04-11 and SIB 64-02-15.
This 0.75L engine was used exclusively in the Renault 4L and early Renault 8 between 1961 and 1967. It appeared in 750 and 800 trim levels. No other Renault models or external manufacturers used this specific engine code. It was replaced by the 810 01 engine in 1967.
Extremely limited potential. Due to its small displacement, carburetted design, and low compression, meaningful gains require full engine rebuild with larger bore, higher compression pistons, and twin-carb setup. ECU remapping is impossible. Most tuning focuses on improving drivability via carburettor jetting and exhaust flow rather than power increase.
Excellent for its era. In a Renault 4L, typical consumption is ~5.5 L/100km (city) and ~4.8 L/100km (highway), or about 52 mpg UK combined. Well-maintained examples with clean carburettors and correct timing can achieve 55–60 mpg on steady highway runs.
No. The 800 01 is a non-interference engine. If the timing chain fails, pistons do not contact valves. While this prevents catastrophic damage, loss of timing still causes severe running issues and necessitates immediate repair.
Renault specifies SAE 20W-50 mineral oil meeting internal specification. Synthetic oils are not recommended due to incompatible additive packages for older seals and bearings. Change interval is 5,000 km or annually, whichever comes first, to ensure adequate lubrication for the camshaft and valve train.
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)
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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.
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