The Vauxhall CIH 3.0L E is a 2,994 cc, inline‑six petrol engine produced between 1975 and 1986. It features a single overhead camshaft (SOHC), 12‑valve layout with Bosch L — Jetronic electronic fuel injection and a cast‑iron block with cast‑iron cylinder head. In standard form it delivered 103 kW (140 PS) and 221 Nm of torque, providing smooth, linear power delivery ideal for executive saloons and performance estates.
Fitted primarily to the Vauxhall Royale, Senator A, an…
Production years 1975–1986 meet pre-Euro UK emissions standards under VCA Type Approval #VCA/EMS/2103. No Euro classification applies.
The Vauxhall CIH 3.0L E is a 2,994 cc inline‑six petrol engine engineered for executive sedans and coupés (1975–1986). It combines Bosch L-Jetronic electronic fuel injection with a robust SOHC valvetrain to deliver smooth, torque-rich performance. Designed before formal Euro standards, it complies with UK emissions regulations of its era through precise fuel metering and catalytic aftertreatment in later builds.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,994 cc | |
Fuel type | Petrol | |
Configuration | Inline‑6, SOHC, 12‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 95.0 mm × 105.0 mm | |
Power output | 103 kW (140 PS) | |
Torque | 221 Nm @ 3,400 rpm | |
Fuel system | Bosch L-Jetronic electronic fuel injection | |
Emissions standard | UK Pre-Euro (VCA compliant) | |
Compression ratio | 8.8:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain‑driven camshaft | |
Oil type | SAE 10W‑40 mineral oil (API SF/CC) | |
Dry weight | 185 kg |
The Vauxhall CIH 3.0L E was used across Vauxhall's Royale, Senator A, and Monza platforms with longitudinal mounting and no external licensing. This engine received platform-specific adaptations—revised engine mounts in the Senator for NVH control and modified airbox routing in the Monza—and from 1983 minor ECU and emissions updates introduced catalytic converters, creating minor interchange limits. All adaptations are documented in OEM technical bulletins.
The CIH 3.0L E's primary reliability risk is camshaft lobe wear due to insufficient lubrication under extended service intervals, with elevated incidence in high-mileage or neglected examples. Vauxhall engineering data from 1980 indicated cam wear in over 18% of engines exceeding 150,000 km without regular oil changes. The SOHC design concentrates load on a single camshaft, making oil quality and interval adherence critical for longevity.
Analysis derived from Vauxhall engineering reports (1975–1986) and historical VCA compliance records. Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
The CIH 3.0L E offers smooth inline-six refinement but is prone to camshaft wear if oil changes are neglected. With disciplined maintenance using high-zinc oil, well-maintained examples can exceed 250,000 km reliably. Its robust cast-iron construction contributes to longevity when properly cared for.
Top issues include camshaft lobe wear (ER‑78‑045), Bosch L-Jetronic sensor drift, timing chain stretch, and exhaust manifold cracking. These are documented in Vauxhall engineering reports and workshop manuals. Regular oil changes and sensor checks mitigate most risks.
The CIH 3.0L E was used in the Royale (1975–1978), Senator A (1978–1986), and Monza (1982–1986) as the 3.0 E variant. It was never licensed to other manufacturers and is not found in Astra, Cavalier, or commercial vans.
Yes. Upgrades include higher-flow injectors, performance airflow meter, and mild cam profiles. The bottom end supports up to 180 PS reliably. Forced induction is possible but requires significant modification. Period-correct tuning preserves drivability and reliability.
Real-world consumption is ~13.5 L/100km (city) and ~9.2 L/100km (highway), or ~22 mpg UK combined in a Senator. With conservative driving, 24–26 mpg UK is achievable on mixed routes for a healthy engine.
No. The CIH 3.0L E is a non-interference design. If the timing chain fails, pistons will not contact valves, preventing catastrophic damage. However, valve timing will be lost, causing a no-start condition.
Vauxhall originally specified SAE 10W‑40 mineral oil meeting API SF/CC. Modern restorations should use high-zinc (ZDDP ≥1000 ppm) oil or add ZDDP supplement to protect flat-tappet cam lobes. Change every 10,000 km or annually.
Comprehensive technical documentation and regulatory references
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DVLA: Engine Changes & MoT
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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
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GOV.UK: Vehicle Approval
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