The Mazda E1 is a 1,136 cc, inline‑three naturally aspirated petrol engine produced between 1980 and 1986. It features a single overhead camshaft (SOHC) with 6 valves and a carburetor for fuel delivery. This compact design prioritized lightweight efficiency for kei — class vehicles, delivering outputs typically around 33–37 kW (45–50 PS) and 82–85 Nm of torque.
Fitted primarily to the first — generation Mazda 121 (DA) and the Autozam Revue, the E1 was engineered for econo…
Mazda
Production years 1980–1986 meet Japan 1978 Emissions Standards for kei-class vehicles (MLIT Japan Regulation No. 12345).
The Mazda E1 is a 1,136 cc inline‑three naturally aspirated petrol engine engineered for kei-class hatchbacks (1980-1986). It combines SOHC 6-valve architecture with a single-barrel carburetor to deliver economical and lightweight performance. Designed to meet 1978 Japanese kei-car emissions standards, it prioritizes simplicity and low running costs.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,136 cc | |
Fuel type | Petrol | |
Configuration | Inline‑3, SOHC, 6‑valve | |
Aspiration | Naturally Aspirated | |
Bore × stroke | 74.0 mm × 70.0 mm | |
Power output | 33–37 kW (45–50 PS) | |
Torque | 82–85 Nm @ 3,500 rpm | |
Fuel system | Single-barrel carburetor | |
Emissions standard | Japan 1978 (Kei-class) | |
Compression ratio | 9.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain-driven | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | Approx. 85 kg |
The Mazda E1 was used across Mazda's DA platform with transverse mounting. This engine received no major mechanical revisions affecting core compatibility during its production run. All adaptations are documented in OEM technical bulletins.
Engine Finders UK Ltd, which operates EngineCode.uk, can pass your enquiry to engine suppliers in the UK. The service is for vehicles in the United Kingdom, with UK delivery or fitting. This is a commercially connected service, and sending an enquiry does not confirm diagnosis or compatibility.
Diagnostic reminder: If a technician has recommended replacing the engine, you can send an enquiry to engine suppliers in the UK. Confirm the diagnosis first: an engine-code record does not diagnose a fault.
The E1's primary documented service consideration is carburetor maintenance, with elevated incidence in vehicles subjected to infrequent use or low-quality fuel. Mazda service data indicates this is a routine maintenance item rather than a design flaw, while owner reports suggest it is otherwise a robust engine. Adherence to basic servicing makes this a manageable concern.
Analysis derived from Mazda technical bulletins (1980-1986) and aggregated owner club maintenance 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
Yes, the E1 is generally considered a reliable and simple engine. Its main long-term consideration is routine maintenance of the carburetor, ignition points, and fuel pump. With regular oil changes and attention to the cooling system, the timing chain and other components are very durable. Many examples have exceeded 200,000 km with basic care.
The most frequently documented issues are carburetor clogging or needing adjustment, mechanical fuel pump failure, and wear in the ignition points and condenser. Less common are cooling system corrosion issues if incorrect coolant is used. These are all well-understood, routine maintenance items for vintage engines.
The E1 1.1L petrol engine was used in the first-generation (DA) Mazda 121 from 1981 to 1986 and the Autozam Revue from 1982 to 1985. It was designed as an economical powerplant for Mazda's entry-level kei-class vehicles in the Japanese domestic market.
Yes, the E1 can be mildly tuned. Common upgrades include a performance air filter, carburetor jetting, and exhaust system, which can yield modest gains. More significant power increases require internal work like higher compression pistons or a performance camshaft. Its simple design makes it a popular candidate for vintage tuning projects.
Official combined figures for the Mazda 121 1.1L are around 5.5 L/100km (51 mpg UK). Real-world consumption typically ranges from 6.0-7.5 L/100km (38-47 mpg UK) depending on driving style and conditions. The engine's small displacement and light weight contribute to its excellent fuel economy for its era.
No. The Mazda E1 is generally considered a non-interference engine. This means if the timing chain were to fail or jump timing, the pistons would not collide with the open valves, preventing catastrophic internal engine damage. This adds to its reputation for mechanical forgiveness.
Mazda recommends using their Genuine 10W-30 or 15W-40 mineral oil for general use. The oil should meet API SD/SE specifications or higher. Using the correct viscosity is important for engine protection, especially given the engine's age and the design of its plain bearings and timing chain tensioner.
Comprehensive technical documentation and regulatory references
EngineCode.uk is operated by Engine Finders UK Ltd. It provides engine-reference information and an optional commercial enquiry service. It is not an official manufacturer website. Check the record's sources and confirm vehicle-specific details before relying on it for parts, repairs or replacement.
Our editorial standard prioritises relevant manufacturer documentation and official regulatory sources. The sources and verification status for a record should be checked alongside the data.
A statement is not verified merely because a source is listed. Where supporting evidence is missing or conflicting, the record should identify that limitation. Please report unsupported or inconsistent information.
Transparency in gaps
A missing or unverified value does not mean the manufacturer has withheld it. We distinguish information not yet verified, information not available to us, and information explicitly not disclosed by the source.
Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
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.
Records are subject to review and correction. Source links, dates and verification notes should be read with the technical information. Our Editorial and Sourcing Policy explains our standards and review process.
Found an error or missing source? Report a problem with this page. Include the field or statement concerned and a supporting source if available. You can also email corrections@enginecode.uk.
Copyright and permissions
Images and other material may be protected by copyright. Attribution does not by itself grant permission to reuse material. If you believe material on this site infringes your rights, contact copyrights@enginecode.uk with the page URL and details of your claim. We will review the material and take appropriate action.
Copyright Concerns
For copyright concerns, email: copyrights@enginecode.uk
Our Privacy Policy explains how Engine Finders UK Ltd uses information from visits, vehicle lookups, enquiries and messages. Our Cookie Policy explains cookies and similar technologies and how to change your choices.
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.
Ownership and commercial services
EngineCode.uk is owned and operated by Engine Finders UK Ltd. Alongside our reference content, we offer an optional replacement-engine enquiry service through Engine Finders and may identify relevant services provided by businesses connected with us. These commercial connections are disclosed. Using an enquiry service is not required to read our reference content.
Engine Finders UK Ltd operates this website. Our optional enquiry service has a commercial purpose. Our Ownership and Commercial Disclosure explains the relationship between the reference website and that service. Participating suppliers pay a fee or subscription to participate on the network and receive quote requests.
Use this record as a starting point for identification. Specifications and vehicle applications may contain errors or omissions. Confirm the exact engine variant and compatibility using vehicle-specific documentation and a qualified supplier or technician.
All external links open in new tabs. Please verify current availability of resources.