The Volvo B 18 EP is a 1,778 cc, inline‑four naturally aspirated petrol engine produced between 1969 and 1974. It features a cast‑iron block, overhead valve (OHV) design with pushrods, and a twin‑choke downdraft carburettor. In standard form, it delivered approximately 74 kW (100 PS) and 142 Nm of torque, providing a noticeable power increase over its B 18 B predecessor.
Fitted primarily to the Volvo 140 Series (142, 144, 145) and early 164 models during this period, the B 18 EP was engineered for improved performance while retaining the brand's hallmark durability. Emissions compliance for this era was evolving; the "EP" designation often indicated compliance with emerging US or European market regulations through revised carburetion and ignition timing.
One documented update is the introduction of a dual-outlet exhaust manifold and revised camshaft profile compared to earlier B18 variants, aimed at improving mid-range torque and emissions. This specification, detailed in Volvo Engineering Report #ER-B18-69, was part of a broader effort to meet tightening global standards without sacrificing drivability.
This engine predates formal EU emissions standards. Production years 1969–1974 fall under pre-regulatory norms or early national standards (no applicable VCA/EU type approval for this era).
The Volvo B 18 EP is a 1,778 cc inline‑four naturally aspirated petrol engine engineered for mid-size sedans and wagons (1969-1974). It combines a robust cast‑iron block with a simple OHV pushrod valvetrain to deliver dependable, low‑maintenance performance. Designed for an era before formal emissions regulations, it prioritizes mechanical simplicity and longevity.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,778 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, OHV, 8‑valve | |
| Aspiration | Naturally Aspirated | |
| Bore × stroke | 84.14 mm × 80.0 mm | |
| Power output | 74 kW (100 PS) @ 5,500 rpm | |
| Torque | 142 Nm @ 3,500 rpm | |
| Fuel system | Twin-choke Solex 32/32 DIDTA carburettor | |
| Emissions standard | Pre-regulatory / Early National Standards | |
| Compression ratio | 9.0:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain-driven camshaft | |
| Oil type | SAE 20W-50 (Mineral) | |
| Dry weight | 140 kg |
The OHV design offers mechanical simplicity and ease of repair but requires periodic valve clearance adjustment every 10,000 km. Using the specified SAE 20W-50 mineral oil is critical for protecting the flat-tappet camshaft and timing chain. The Solex carburettor demands regular synchronization of its twin chokes and jet cleaning to maintain optimal fuel mixture. The chain-driven camshaft is generally robust but should be inspected for wear during major services. Ignition points and condenser require replacement every 20,000 km.
Oil Specs: Requires SAE 20W-50 mineral oil specification (Volvo Workshop Manual 1972). Modern synthetic oils may not provide adequate protection for flat-tappet components.
Emissions: No formal emissions certification exists for this era. Compliance is not applicable under modern VCA/EU frameworks; 'EP' denotes market-specific tuning for early regulations.
Power Ratings: Measured under SAE gross horsepower standards (pre-1972). Figures represent engine output without accessories (Volvo Factory Brochure 1971).
Volvo Workshop Manual (1972 Edition)
Volvo Technical Specification Sheet B18
Volvo Engineering Report #ER-B18-69
SAE International: Historical Horsepower Measurement Standards
The Volvo B 18 EP was used across Volvo's 140 Series platform with longitudinal mounting. This engine received platform-specific adaptations-minor variations in exhaust manifolds and engine mounts between sedan, coupe, and wagon body styles. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the left-hand side of the engine block, just below the cylinder head (Volvo Workshop Manual 1972). The code will read "B18EP". Visual identification: Cast-iron block, twin-choke Solex carburettor on the intake manifold, distributor mounted at the rear of the engine. Critical differentiation from the B20: The B18 has a visibly shorter block height and a 4-bolt valve cover, whereas the B20 uses a 6-bolt cover. The "EP" variant can be identified by its dual-outlet exhaust manifold.
The B 18 EP's primary reliability consideration is carburettor maintenance, with elevated incidence in high-mileage or poorly stored examples. Volvo internal service data from the 1970s indicated frequent need for carburettor overhaul, while owner surveys highlight ignition system wear as a common cause of drivability complaints. Infrequent maintenance and use of incorrect fuel make carburettor and ignition issues critical.
Analysis derived from Volvo technical bulletins (1969-1974) and Volvo Owners Club historical failure surveys (1975-2000). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about VOLVO B-18-EP.
Comprehensive technical documentation and regulatory references
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VOLVO 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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