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The Beta Marine Engine – Beta 25 is a robust and dependable 3‑cylinder diesel propulsion engine, delivering 25 hp (18.5 kW) at 3,600 RPM. Designed for sailboats in the 26–32 ft range, this marinized Kubota platform offers smooth, quiet cruising and easy servicing.
Key Features
- 3‑cylinder naturally aspirated Kubota-based engine.
- Displacement: 898 cc, bore 67 mm × stroke 68 mm.
- Heat exchanger cooling and high-inertia flywheel for low noise.
- Indirect injection, gear-driven camshaft, three‑vortex combustion.
- Standard: 40 A alternator, ABV instrument panel, flexible mounts, TMC 40 gearbox.
Duty Cycle & Usage
- Application: Mid‑range marine propulsion
- Load Variations: Light to moderate
- Load Factor: 40%–80%
- Annual Usage: Up to ~2,000 hours/year
- Installation Angles: ≤ 15° static / ≤ 25° when heeling
Technical Specifications: Beta 25 Marine Engine
| Power Output | 25 hp (18.5 kW) @ 3,600 RPM |
|---|---|
| Cylinders | 3 inline |
| Displacement | 898 cc |
| Bore & Stroke | 67 × 68 mm |
| Cooling System | Fresh/raw water heat exchanger |
| Fuel System | Indirect injection, mechanical governor |
| Alternator | 40 A @ 12 V |
| Transmission | TMC 40 mechanical gearbox (~2:1) |
| Dry Weight | ≈ 113 kg (250 lbs) |
| Start System | 12 V electric starter |
| Control Panel | ABV series with tachometer, hour meter, alarms |
Operating Conditions
- Ambient Temp: ≤ 45 °C
- Fuel Type: EN 590 marine diesel
- Installation Angles: ≤ 15° static / ≤ 25° heeling
Applications
The Beta 25 Marine Engine is ideal for:
- Sailboats 26–32 ft (perfect for Atomic 4 repowers)
- Classic wooden yachts and tenders
- Light-displacement motorboats
- Repower and retrofit installations
kW 18.5
RPM 3600
Duty Moderate marine propulsion
Emissions RCD II, EPA Tier III compliant
