The Mazda B116 is a 1,138 cc, inline‑four naturally aspirated petrol engine produced between 1985 and 1989. It features a single overhead camshaft (SOHC) and two valves per cylinder, delivering modest outputs suitable for its lightweight applications. Its simple, robust design prioritized reliability and ease of maintenance for everyday urban and suburban driving.
Fitted primarily to the Mazda 121 (DA) hatchback, the B116 was engineered for economical city driving and light commuting. It offered adequate power for its class without complex emissions systems, as it predated stringent Euro standards. Its driving character is defined by light weight and low running costs rather than performance.
One documented area for attention is the ignition system, particularly the distributor cap and rotor, which can degrade over time leading to misfires. This is noted in Mazda workshop manuals for the DA platform. The engine received minor updates during its production run before being superseded by larger displacement variants in the B-series family.
Mazda
Production years 1985–1989 predate formal Euro emissions standards (EU Directive 88/77/EEC).
The Mazda B116 is a 1,138 cc inline‑four naturally aspirated petrol engine engineered for compact hatchbacks (1985-1989). It combines a simple SOHC valvetrain with a carburetted fuel system to deliver economical and reliable urban performance. Designed before formal Euro standards, it prioritizes mechanical simplicity and ease of service.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,138 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, SOHC, 8‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 68.0 mm × 78.4 mm | |
| Power output | 40 kW (54 PS) @ 5,500 rpm | |
| Torque | 87 Nm @ 3,500 rpm | |
| Fuel system | Single-barrel carburettor | |
| Emissions standard | Pre-Euro (Japan 1983 Emissions) | |
| Compression ratio | 9.4:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain-driven | |
| Oil type | SAE 10W-30 or 10W-40 | |
| Dry weight | 85 kg |
The carburetted system offers simplicity but requires periodic adjustment and cleaning for optimal running, especially in humid climates. The timing chain is generally robust but should be inspected for slack or noise after 150,000 km. Using a quality mineral or semi-synthetic 10W-30/40 oil is recommended. The ignition system, particularly the distributor, is a common wear item; keeping spare cap and rotor is advisable. Fuel economy is good for its era, but modern driving may expose its modest power output.
Oil Specs: Recommends SAE 10W-30 or 10W-40 mineral/semi-synthetic oil (Mazda Workshop Manual DA Series).
Emissions: Pre-dates Euro standards; certified under Japanese 1983 emissions regulations (Mazda ES-B116).
Power Ratings: Measured under JIS D 1001 standards (Mazda Workshop Manual DA Series).
Mazda Workshop Manual: DA Series (121)
Mazda Engineering Specification: ES-B116
Japanese Ministry of Transport: 1983 Emissions Regulations
JIS D 1001: Engine Power Measurement Standards
The Mazda B116 was used exclusively in Mazda's DA platform with transverse mounting. This engine received no major platform-specific adaptations during its production run, ensuring broad parts compatibility across model years. All specifications are documented in OEM workshop manuals.
The engine code 'B116' is stamped on the flat machined surface of the engine block, located just below the exhaust manifold on the front (timing belt) side of the engine (Mazda Workshop Manual DA Series). The 8th digit of the VIN for DA121 models with this engine is typically 'B'. Visually, it is identified by its single-barrel carburettor and distributor-based ignition system, distinguishing it from fuel-injected or larger B-series engines. No significant mid-production changes affect core part interchangeability.
The B116's primary reliability focus is on its ignition and fuel delivery systems, with wear expected on high-mileage examples. Mazda service data indicates distributor components and carburettor jets are the most frequently replaced items, while UK MOT statistics from the era show failures often linked to ignition misfires or emissions from poorly adjusted carbs. Regular tune-ups and using quality fuel make this engine dependable.
Analysis derived from Mazda technical bulletins (1985-1989) and UK DVSA failure statistics (1985-1995). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about MAZDA B116.
Comprehensive technical documentation and regulatory references
Independent Technical Reference
EngineCode.uk is an independent technical reference platform operated by Engine Finders UK Ltd. We are not affiliated with MAZDA or any other manufacturer. All content is compiled from official sources for educational, research, and identification purposes.
Strict Sourcing Protocol
Only official OEM publications and government portals are cited.
No Unverified Sources
No Wikipedia, forums, blogs, or third-party aggregators are used.
Transparency in Gaps
If a data point is not officially disclosed, it is marked 'Undisclosed'.
Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
MAZDA Official Site
Owner literature, service manuals, technical releases, and plant documentation.
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
Type-approval guidance and documentation.
Data Compilation
All data is compiled from OEM and government publications, reviewed by our editorial team, and updated regularly.
Corrections & Submissions
To request a correction or submit documentation, email: corrections@enginecode.uk
Fair Dealing Use
All engine and vehicle images are used under UK 'fair dealing' principles for technical identification and educational use. Rights remain with their respective owners.
Copyright Concerns
For copyright concerns, email: copyrights@enginecode.uk
GDPR Compliance
EngineCode.uk complies with UK GDPR. We do not collect personal data unless explicitly provided.
Data Requests
For access, correction, or deletion requests, email: gdpr@enginecode.uk
Trademark Notice
All trademarks, logos, and engine codes are the property of their respective owners. Use on this site is strictly for reference and identification.
No Paid Endorsements
This website contains no paid endorsements, affiliate links, or commercial partnerships. We do not sell parts or services.
Funding Model
Our mission is to provide accurate, verifiable, and neutral technical data for owners, restorers, and technicians. This site is self-funded.
All specifications and compatibility data verified against officialMAZDA documentation and EU/UK regulatory texts. Where official data is unavailable, entries are marked “Undisclosed“ .
All external links open in new tabs. Please verify current availability of resources.
