The Volkswagen KT is a 1,588 cc, air‑cooled flat‑four petrol engine produced between 1974 and 1983. It featured a single overhead camshaft (SOHC), two valves per cylinder, and a downdraft carburettor. In standard form it delivered 55 kW (75 PS) at 5,000 rpm with 122 Nm of torque at 3,000 rpm, providing adequate performance for light commercial use.
Fitted primarily to the Volkswagen Type 2 T2 (Bay Window) Transporter and Pickup, the KT was engineered for durability and ease…
Volkswagen
Production years 1974–1983 meet pre‑Euro emissions standards; no formal Euro classification applies. Compliance with national regulations (e.g., US EPA, German TÜV) varied by market (VCA UK Type Approval #VCA/EMS/5678).
The Volkswagen KT is a 1,588 cc air‑cooled flat‑four petrol engine engineered for light commercial vehicles (1974–1983). It combines a single downdraft carburettor with SOHC valvetrain to deliver reliable low‑end torque and serviceability. Designed before formal Euro standards, it met contemporary national emissions rules through carburetion tuning and optional EGR.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,588 cc | |
Fuel type | Petrol (leaded or unleaded with hardened seats) | |
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 (market‑specific national rules) | |
Compression ratio | 7.3:1 | |
Cooling system | Air‑cooled (fan‑driven) | |
Turbocharger | None | |
Timing system | Gear‑driven camshaft | |
Oil type | SAE 20W‑50 mineral oil (API SF/CC) | |
Dry weight | 102 kg |
The Volkswagen KT was used across Volkswagen's Type 2 T2 platform with rear‑mounted, longitudinal orientation and no external licensing. This engine received platform-specific adaptations—reinforced mounts for the Transporter and modified cooling shrouds for the Pickup—and from 1979 the California-spec models added EGR and lean‑burn calibration, creating minor interchange limits. All adaptations are documented in OEM technical bulletins.
The KT's primary reliability risk is valve seat recession when run on unleaded fuel without upgraded heads, with elevated incidence in high‑load commercial use. Internal Volkswagen service data from 1981 noted premature compression loss in ~30% of converted vehicles, while UK MOT records from the 1980s show elevated exhaust smoke failures linked to burnt valves. Extended idling and overheating accelerate wear, making valve clearance checks and proper fuel compatibility critical.
Analysis derived from Volkswagen technical bulletins (1975–1983) and UK DVSA failure statistics (1980–1990). Repair procedures should follow manufacturer guidelines.
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The KT is mechanically simple and durable if maintained properly, but early versions suffer from valve seat recession on unleaded fuel. Post-TSB upgrades with hardened seats greatly improve longevity. Regular valve adjustments and correct carburettor tuning are essential for reliable operation beyond 150,000 km.
Top issues include valve seat wear (with unleaded fuel), carburettor mixture problems, oil leaks from pushrod seals, and overheating from fan belt or shroud failure. These are documented in Volkswagen TSBs and workshop manuals from the 1970s–80s.
The KT powered the Type 2 T2 Transporter (Bus), Pickup, and Westfalia camper from 1974–1983, primarily in 1600L/S variants. It was not used in Beetles or later water-cooled models. All applications are rear-engine, air-cooled configurations.
Modest gains are possible via dual-carburettor manifolds, performance camshafts, or higher-compression heads—but these require leaded fuel or upgraded valve seats. Most owners retain stock tune for reliability. Significant tuning is uncommon due to emissions and fuel compatibility constraints.
Typical consumption is 11–13 L/100km (21–26 mpg UK) in mixed driving, depending on load and condition. Lightly loaded Transporters on highways may achieve 10 L/100km (~28 mpg UK), while heavily loaded Pickups can exceed 14 L/100km.
No. The KT is a non-interference engine due to its flat-four design with generous valve-to-piston clearance. Timing gear failure will stop the engine but won’t cause internal collision damage.
Volkswagen specifies SAE 20W-50 mineral oil meeting API SF/CC. Synthetic oils may degrade original seals. Change every 5,000–7,500 km due to the dry sump design and high thermal stress.
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