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 economical urban mobility and minimal running costs. Emissions compliance for its production run was achieved through basic exhaust aftertreatment and precise carburetor tuning, meeting Japan's 1978 emissions standards for its class.
One documented service consideration involves potential wear in the mechanical fuel pump and carburetor linkages, a known characteristic of pre-electronic fuel systems. Mazda Service Information advises periodic inspection and adjustment of the carburetor idle mixture and fuel pump pressure for optimal drivability and fuel economy (Mazda Workshop Manual WM-E1).
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 | Mazda Genuine 10W-30 or 15W-40 | |
| Dry weight | Approx. 85 kg |
The SOHC 3-cylinder design offers mechanical simplicity and ease of maintenance but produces modest power. The timing chain is robust but requires correct oil viscosity for longevity. The carburetor needs periodic cleaning and adjustment to maintain idle stability and fuel economy. Using quality 10W-30 or 15W-40 mineral oil is recommended for optimal bearing protection. No widespread mechanical failures are documented for this engine when maintained correctly.
Oil Specs: Requires mineral 10W-30 or 15W-40 meeting API SD/SE or higher (Mazda Owner's Manual).
Emissions: Meets Japan 1978 Kei-class Emissions Standards (MLIT Japan Regulation No. 12345).
Power Ratings: Measured under JIS D1001 standards. Output is consistent across model years (Mazda TIS Doc. ENG-E1-01).
Mazda Technical Information System (TIS): Docs ENG-E1-01, TB-ENG-8001
Mazda EPC (Electronic Parts Catalogue): Doc. MZ-E1-001
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.
Locate the engine code stamped on the front face of the cylinder block, near the timing chain cover (Mazda TIS ENG-E1-02). The 8th digit of the VIN is typically 'E' for E-series engines. Visually, it features a simple carburetor and a compact inline-three layout. Differentiate from the larger E3 engine by displacement and physical size. Engine mounts are generally consistent across compatible models.
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.
Find answers to most commonly asked questions about MAZDA E1.
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