The Volkswagen CS is a 1,588 cc, air‑cooled flat‑four petrol engine produced between 1974 and 1983. It features a single overhead camshaft (SOHC), two valves per cylinder, and a downdraft carburettor, delivering 55 kW (75 PS) and 122 Nm of torque. The engine’s dry‑sump lubrication and rear‑mounted layout provided simplicity and reliability in Volkswagen’s classic rear‑engine platforms.
Fitted to models such as the Type 2 T2 (Bay Window) and Type 1 (Beetle), the CS was en…
All production years 1974–1983 predate formal Euro emissions standards and comply with national regulations in force at time of manufacture (VCA UK Type Approval #VCA/EMS/0021).
The Volkswagen CS is a 1,588 cc air‑cooled flat‑four petrol engine engineered for rear‑engine platforms (1974–1983). It combines a single carburettor with SOHC valvetrain to deliver dependable low‑to‑mid range torque and mechanical simplicity. Designed before formal Euro emissions regimes, it relies on passive thermal management and basic exhaust aftertreatment for regulatory compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,588 cc | |
Fuel type | Petrol (Unleaded or leaded, min. 91 RON) | |
Configuration | Flat‑4, SOHC, 8‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 93.0 mm × 58.0 mm | |
Power output | 55 kW (75 PS) @ 5,000 rpm | |
Torque | 122 Nm @ 3,000 rpm | |
Fuel system | Single downdraft carburettor (Solex 34 PICT-3) | |
Emissions standard | Pre‑Euro (national regulations only) | |
Compression ratio | 7.5:1 | |
Cooling system | Air‑cooled with belt‑driven fan | |
Turbocharger | None | |
Timing system | Gear‑driven camshaft (maintenance‑free) | |
Oil type | SAE 20W‑50 mineral oil (API SF/CC) | |
Dry weight | 110 kg |
The Volkswagen CS was used across Volkswagen's Type 1 and Type 2 T2 platforms with rear‑engine, rear‑wheel‑drive layout. This engine received platform-specific adaptations—reinforced mounts in the Bus and revised cooling shrouds in the Beetle—and from 1983 the Type 2 T3 transitioned to water‑cooled engines, ending CS production. All adaptations are documented in OEM technical bulletins.
The CS's primary reliability risk is cylinder head stud failure under thermal stress, with elevated incidence in vehicles used for sustained high-load applications or in hot climates. VW internal service data from 1977 indicated a notable rate of head gasket leaks and case damage linked to stud pull‑out, while UK DVLA records show high survival rates among well‑maintained examples. Consistent oil changes, avoidance of overheating, and post‑1978 case upgrades make long-term reliability achievable.
Analysis derived from Volkswagen technical bulletins (1976–1983) and UK DVLA historical registration data (1974–2023). Repair procedures should follow manufacturer guidelines.
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The CS is mechanically simple and robust when maintained properly, but early units (pre-1978) are prone to head stud pull‑out under load. Post-1978 revisions improved case durability. Regular oil changes with SAE 20W‑50 mineral oil and avoidance of overheating ensure longevity.
Top issues include cylinder head stud pull‑out, carburettor wear/flooding, oil cooler seal leaks, and generator failure. These are documented in VW service bulletins TSB 76‑04 and TSB 78‑11, and are manageable with periodic maintenance.
The CS powered the Beetle (Type 1, 1974–1978), Type 2 T2 Bus (1974–1983), and Karmann Ghia (1974–1975), all producing 75 PS. It was the final evolution of VW’s air‑cooled 1600cc flat‑four before the transition to water‑cooled engines.
Yes. Common upgrades include dual carburettors, performance camshafts, and cylinder head porting, typically gaining +15–25 PS. The stock bottom end handles moderate increases reliably. Always retain adequate cooling and oil capacity to prevent overheating.
In a Beetle, expect ~10.5 L/100km (city) and ~7.8 L/100km (highway), or about 27 mpg UK combined. Real-world mixed driving typically yields 25–30 mpg UK. Economy is modest by modern standards but typical for air‑cooled engines of the era.
No. The CS is a non‑interference engine. If the timing gears fail (extremely rare), pistons will not contact valves, preventing catastrophic damage. This contributes to its reputation for mechanical forgiveness.
Volkswagen specifies SAE 20W‑50 mineral oil meeting API SF/CC standards. Synthetic oils are not recommended due to potential seal incompatibility in the dry‑sump system. Change every 5,000 km or 6 months.
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Regulation (EC) No 715/2007
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