Choosing a powertrain for a swimming vehicle is always a compromise between power, economy and cost of ownership. - Spanish brand Selva Marine For more than half a century, it has taken a strong position in the global market, offering solutions for both professional fishermen and fans of outdoor activities on the water. Selva It is often the choice of those who are looking for time-tested equipment without overpaying for marketing, but with the preservation of high build quality.
The company's history dates back to 1969, when the first engines were launched in Mallorca, and since then, the company's engineers have gone from simple two-stroke units to the most complex four-stroke systems with electronic control. Selva Marine plants are located not only in Spain, but also in Thailand.This allows the brand to compete with the giants of the industry in terms of production volume and pricing policy, while maintaining European quality control.
In this article, we will take a closer look at the technical features of the various series, discuss the nuances of maintenance and help you decide on the model that will be ideal for your tasks. Whether it is a quiet walk on the lake or a high-speed exit to the sea, the right power plant will be the heart of your boat.
Brand history and production capacity
Success of the company Selva Marine It's a well-established strategy and partnership with some of the world's biggest manufacturers, and the Spaniards initially partnered with Yamaha to adopt advanced technology and build reliable two-stroke engines, and later, with the advent of environmental standards, the brand adapted to the four-stroke engines that are now the backbone of the lineup.
Modern manufacturing is based on advanced automated lines, and the plant in Thailand, which opened in the early 2000s, has become a key hub for small and medium-power engines, reducing the cost of the final product while maintaining the availability of spare parts around the world.
⚠️ Warning: When buying a used Selva engine, be sure to check the year of production and country of assembly. Early models and modern versions can differ significantly in the availability of electronics and attachments.
It's important to understand that Selva is not just an assembly shop, it's a full-fledged engineering center, and it develops its own cooling systems, gearboxes and gas control systems. Integration of technologies The company’s partners are able to create hybrid solutions where the reliability of Japanese engines is combined with European ergonomics and design.
Technical features and model range
The product range covers almost all the needs of water engines, from compact “five-powered” inflatable boats to powerful V6 for boats, each engine is strictly controlled, the main division is by the type of work cycle: two-stroke (2T) and four-stroke (4T) engines.
Selva’s two-stroke engines are renowned for their thrust and simplicity of design, lighter than four-stroke engines, which is critical for small PVC boats. The oil-mixed-gasoline lubrication system (or through a separate tank in modern models) provides efficient cooling of rubbing vapors. However, they require more careful attention to the preparation of the fuel mixture.
Four-stroke units are the choice of those who value silence and economy, they have a lower fuel consumption of 30-40% compared to the 2T, and noise and vibration levels are minimal, having a separate oil lubrication system (carpridge) eliminates the need to mix gasoline. Enduro and Pro They are equipped with EFI (electronic injection) systems, which makes them even more efficient.
Special attention should be paid to the cooling system, which is that most models use forced circulation of off-shore water through an impeller, which is an effective way, but it requires regular checks of the control jet. Overheating The main enemy of any outboard motor, and Selva equips its engines with temperature sensors that signal a problem with sound or power reduction.
Engine Series: from Force to Marlin
The Selva engine lineup is understood by the series, each of which is tailored to a specific operating environment. Force These are budget and reliable two-strokes, often chosen for work tasks. Marlin It is aimed at anglers, offering quiet running and economy.
For those looking for maximum performance, a series has been created. ProThese motors have increased compression, improved cylinder purging, and often have electronic throttle control, and they're designed for high-speed gliders and require high-quality fuel.
- 🚤 The Force series: Classic two-stroke engines, time-tested, are ideal for simple tasks and work in heavy conditions.
- 🐟 Marlin series: Eco-friendly four-stroke engines with low noise level, created for long fishing.
- 🚀 Series Pro: High-performance units with advanced fuel injection system for high-speed vessels.
- 🔋 Electric series: Modern electric motors for quiet movement in protected areas.
It's worth celebrating the series. NinjaThese are compact, low-power two-stroke engines, which are very popular with inflatable boat owners because of their light weight, and they are designed to be easily transported in the trunk of a car without the risk of oil leakage.
Comparative table of specifications of popular models
To make the choice easier, we will give comparative specifications of several popular models of different power, these parameters will help to orient in weight and flow.
| Model | Power (hp) | Type | Weight (kg) | Workload (cm3) |
|---|---|---|---|---|
| Selva 5B | 5 | 2T | 19 | 98 |
| Selva 9.9B | 9.9 | 2T | 29.5 | 169 |
| Selva 15D | 15 | 4T | 38 | 300 |
| Selva 30D | 30 | 4T | 58 | 500 |
| Selva 115 Pro | 115 | 4T | 145 | 1800 |
The following table shows that four-stroke motors (4T) at the same power, they may be heavier than two-stroke counterparts, but the weight difference is offset by the lack of need to carry oil canisters and lower fuel consumption. For boats longer than 3.5 meters, the weight difference becomes less noticeable against the background of the advantages of the 4T.
When choosing, you should also consider the length of the lower unit. Standard length (S) is about 38-40 cm, long (L) - about 50-52 cm Incorrect choice of length can lead to cavitation (air capture by a screw) or, conversely, to excessive water resistance and overheating.
Maintenance and maintenance
The durability of the Selva outboard motor depends on the quality and regularity of maintenance. Regular work does not require complex equipment, but it cannot be ignored.
The first maintenance is usually done after running (the first 10 hours of motor running), during which time the oil in the gearbox is replaced and, in the case of a four-stroke motor, in the engine crankcase, and the tightening of the mount bolts is checked, since the vibration when the new engine is running can weaken the connections.
☑️ Checklist of seasonal services
Ignition plugs are an important element of the ignition system. For two-stroke engines, it is recommended to use candles with a potash number corresponding to the mode of operation (usually NGK BR7HS or BR8HS). Blackened soda indicates a rich mixture or poor-quality oil, white soda indicates overheating or poor mixture.
⚠️ Warning: Never leave the motor in water for long periods of time unnecessarily, and shelling and corrosion of aluminum alloys can begin within weeks of being parked in salt water.
Pay special attention to the fuel system. Modern Selva engines are sensitive to gasoline quality. Using fuel with an octane number below the recommended (usually an AI-92 or an AI-95) can lead to detonation and damage to the piston group. Be sure to use fuel filters-settlers.
Typical malfunctions and methods of their elimination
Even the most reliable mechanism can fail, knowing the typical problems will help you navigate the water quickly, and most often owners face startup problems or loss of power.
If the engine doesn't start, the first thing you do is check for sparks on the candle and the fuel supply. In two-stroke engines, a common cause is clogging of the carburetor's jelly glands or leaky crankshaft glands. In four-stroke engines, problems with compression or valves.
Overheating is often caused by damage to the water pump impeller. If the control jet of water has become weaker or disappeared, immediately shut down the engine. Operating without cooling for even a couple of minutes can lead to bullying in the cylinders and expensive repairs.
Operation and storage tips
Proper operation prolongs the life of the engine. Don't give it full gas immediately after starting. Let the engine warm up at idle speeds for 2-3 minutes. This is especially important in the cold season, when the oil has not yet reached the operating temperature and does not envelop all the parts.
When stored in the off-season, the engine must be preserved, special conservation oil is poured into the cylinders through the candle holes and the starter is scrolled, and the fuel system should also be drained or preserved with a fuel stabilizer to avoid resins.
It's better to keep the motor upright so that the water is completely glass from the cooling system. If you can't, be sure to blow the system with compressed air. Corrosion inside the water channels is a hidden enemy that can unnoticedly destroy a block of cylinders in one winter.
Frequently Asked Questions (FAQ)
What is the best oil to use into a two-stroke Selva engine?
Use only quality oils labeled TC-W3. Synthetic oils provide better protection and less nagaroprosm, but mineral oils are also acceptable when the correct mixing proportions are followed.
Which screw to choose for a heavy boat?
For heavy boats or when loaded, it is recommended to use a screw with a smaller pitch, which will allow the engine to more easily get on plane and work in the optimal range of revolutions, preventing overheating.
Can I transport the Selva motor on the side?
Four-stroke motors are not recommended to be placed on the side, as oil from the crankcase can get into the combustion chamber or air filter. Two-stroke motors are more tolerant, but it is better to transport them strictly vertically or on a special bed.
How often should you change the oil in the gearbox?
The oil in the gearbox is recommended to be changed once a season or every 100 motor hours. If the leaked oil shows an emulsion (white), then the sealing of the oslugs is broken and they need to be replaced.