The Audi KP is a 1,795 cc inline-four petrol engine produced between 1970 and 1976. It was developed during Audi's transition under Volkswagen Group ownership and featured in several rear-wheel-drive models. The engine uses a cast-iron block, overhead valve (OHV) configuration, and twin Solex carburettors in higher-output versions, delivering up to 90 PS (66 kW) with 145 Nm of torque.
Fitted primarily to the Audi 80 (B1) and Audi 100 (C1/C2) base variants, the KP engine was engineered for economical daily driving and reliable mid-range performance. It met early European emissions standards through basic air injection and ignition timing controls, achieving what would later be classified as pre-Euro emissions compliance depending on model year and market.
One documented concern is premature camshaft and lifter wear, particularly in units with extended oil change intervals. This issue, referenced in Audi Service Information Bulletin 03.75.01, is attributed to inadequate lubrication film strength under high-load conditions with non-specified oils. Later production batches incorporated slight metallurgical improvements to the cam lobes to reduce wear rates.
Production years 1970–1976 meet pre-Euro emissions standards; exact compliance varies by market and model year (EU Directive 70/220/EEC).
The Audi KP is a 1,795 cc inline-four OHV petrol engine engineered for compact and mid-size sedans (1970–1976). It combines a robust cast-iron construction with twin-carburettor aspiration in performance variants to deliver linear power delivery and mechanical simplicity. Designed to meet early European emissions directives, it prioritises durability and serviceability over high specific output.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,795 cc | |
| Fuel type | Petrol | |
| Configuration | Inline-4, OHV, 8-valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 85.0 mm × 79.0 mm | |
| Power output | 75–90 PS (55–66 kW) | |
| Torque | 135–145 Nm @ 3,000 rpm | |
| Fuel system | Single or twin Solex 40 PDSI carburettors | |
| Emissions standard | Pre-Euro (EU Directive 70/220/EEC) | |
| Compression ratio | 9.0:1 (standard), 9.8:1 (high-compression) | |
| Cooling system | Water-cooled | |
| Turbocharger | Not applicable | |
| Timing system | Chain-driven camshaft | |
| Oil type | SAE 10W-40 mineral oil (API SD/CC) | |
| Dry weight | 138 kg |
The OHV design offers mechanical simplicity and ease of maintenance but requires periodic valve clearance checks to maintain performance. Use of correct SAE 10W-40 mineral oil meeting API SD specifications is critical to prevent camshaft and lifter wear, especially under sustained load. Carburettor tuning should be performed with factory specifications; incorrect jetting affects emissions and fuel economy. High-compression variants demand 98 RON fuel to prevent knocking. Units with documented chain wear should have guides and tensioner inspected. All service procedures must follow Audi TIS documentation to ensure longevity.
Oil Specs: Requires API SD/CC mineral oil (Audi SIB 03.75.01). Synthetic oils not recommended due to seal compatibility.
Emissions: Pre-Euro certification applies to all models (EU Directive 70/220/EEC). No DPF or catalytic converter fitted.
Power Ratings: Measured under DIN 70020 standards. 90 PS output requires high-compression head and twin carburettors (Audi TIS A18210).
Audi Technical Information System (TIS): Docs A17950, A18210, SIB 03.75.01
European Commission Type Approval Database (Directive 70/220/EEC)
SAE International: DIN 70020 Engine Power Measurement Standard
The Audi KP was used across Audi's B1/C1/C2 platforms with longitudinal mounting. This engine received platform-specific adaptations—twin carburettor setup in the Audi 80 LS and single-carburettor economy tune in base Audi 100 models—and from 1973, the facelifted Audi 80 adopted revised intake manifolds, creating interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped horizontally on the front face of the cylinder block, near the timing cover (Audi TIS A17975). The 8th VIN digit indicates engine type ('K' for 1.8L OHV series). Pre-1973 models have a single Solex carburettor with a chrome air cleaner; post-1973 LS variants use twin Solex 40 PDSI units. Critical differentiation from 1.6L OHV: KP has a longer block deck and larger oil pan. Service parts require model-year verification—carburettor kits for single- and twin-carb setups are not interchangeable (Audi SIB 03.75.01).
The KP's primary reliability risk is camshaft and lifter wear, with elevated incidence in high-mileage or poorly maintained units. Internal Audi service reports from 1975 noted a significant number of engines requiring cam replacement before 100,000 km when non-specified oils were used, while DVSA historic failure data shows valve train noise as a common MOT advisory. Extended oil intervals and use of non-API SD oils increase wear, making correct lubrication and maintenance critical.
Analysis derived from Audi technical bulletins (1973-1976) and UK DVSA historic failure statistics (1975-1985). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about AUDI KP.
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Regulation (EC) No 715/2007
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