The Soviet era of water tourism and fishing is unthinkable without the thunderous, smoky, but incredibly tenacious sound of a two-stroke engine. boat-engineThe silk-powered silk, which has become a symbol of waterway accessibility for millions of Soviet citizens, has been produced in Kuibyshev (now Samara) since 1964 and still plows the vastness of rivers and lakes, despite the emergence of more modern and environmentally friendly analogues.
The phenomenal popularity of the car was due to its simple design, maintainability and relative cheapness of parts, and even today, when the market is crowded with Chinese equipment, many owners prefer to keep up with time-tested machines. Whirlwind-M, Whirlwind-25, Whirlwind-30 These names are familiar to anyone who has ever held a rummel in his hands or smelled a mixture of gasoline and oil.
In this article, we will discuss in detail the history of creation, technical features, as well as current issues of operation and maintenance of these legendary engines. You will learn why they last so long and what to look for when buying a used copy.
History and evolution of the model range
History boat-engine vortex It started in the mid-60s, when the Kuibyshev Engine Plant (KMZ) was tasked with creating a mass outboard motor for a wide range of consumers, prototyped by German designs, but Soviet engineers made significant changes, adapting the design to domestic realities and available materials, and the first swallow was a 20 horsepower model that instantly became scarce.
In the future, the lineup expanded, there are modifications with electronic ignition and improved cooling system. Whirlwind-25 and Whirlwind-30 They were the direct successors to the first model, which had greater power and reliability, and the design remained two-stroke, which provided high torque at low rpm, critical to the planing under full load.
- 🚀 1964 - the beginning of serial production of the first model with a capacity of 20 hp
- ⚙️ 1970s - introduction of an electronic ignition system (models with an index "E").
- 🔧 1980s - modernization of the lower unit and improvement of the lubrication system in the models "M" and "30".
- 🇷🇺 Post-Soviet period Production continues, component suppliers change, but the base remains the same.
⚠️ Note: When buying an older engine, look at the year of production. Models before 1975 often have carburetors prone to freezing and the lack of a gearshifter in some early versions.
The evolution has been to increase the resource and usability, whereas the first models required the owner to be a stationary mechanic almost every time they went to the water, later versions such as the one that was used in the first model. Electron vortex 30The factory was constantly working to eliminate "childhood diseases," although some of the design features that became a parable remained unchanged.
Technical specifications and design features
The basis of the design of all models of the family is two-stroke This scheme allowed for high-liter power at a minimum weight, the cylinder block is made of aluminum alloy with cast iron shells, which ensured good heat sink and wear resistance. The most important element is the cooling system, which is implemented in a closed type with forced water circulation through the shirt.
The fuel system is a float carburetor, and the early models were the K-36s, and later the more advanced components. Whirlwind-25 and Whirlwind-30 They were equipped with carburetors that allowed better dosing of the mixture, which had a positive effect on fuel consumption and nagaroprosm. The ignition system on later models became electronic (magdino), which saved owners from the eternal problem of burned capacitors and the need to adjust the gaps in the interrupter.
For stable operation of the engine, use AI-92 gasoline and high-quality two-stroke oil in the ratio of 1:25 for running and 1:30-1:40 for constant operation, unless otherwise specified in the instructions.
The transmission is made in the form of a lower unit, inside which there is a propeller shaft and a gearshift mechanism. Reverse gearbox It's a simple design, but it requires regular testing for water in the oil. boat-engine.
| Parameter | Whirlwind-M | Whirlwind-25 | Whirlwind-30 |
|---|---|---|---|
| Power, HP. | 20 | 25 | 30 |
| Working capacity, cm3 | 346 | 478 | 478 |
| Weight, kg | 37 | 46 | 46 |
| Fuel tank, l | 12 | 12-20 | 12-20 |
| Type of ignition | Contact. | Contact/Electronic | Electronically |
The suspension and mounting system deserves special attention. vortex They have a specific design that differs from modern standards, and this often creates problems when installed on modern PVC boats or boats that are not adapted to Soviet fasteners, but the strength of the mount is not in doubt - it is extremely difficult to tear it off the transomb even in a severe storm.
Running a new or rebuilt engine
Right. break-in It's a long-term engine, and many owners ignore this stage, and then they pay for the reciprocating, the grinding of the rubbing parts takes time and the temperature, you can't get full gas right away, and you can't keep the engine idling for long.
The first hours of operation should be spent on an enriched mixture, to do this, more oil is added to the benzo-oil mixture than is recommended for normal operation, usually the ratio is 1:20 or even 1:15 at the beginning, the engine must operate in a gentle mode, periodically changing revolutions so that the rings fit evenly against the walls of the cylinder.
☑️ Checklist of proper breaking in
⚠️ Warning: During the break-in, strictly monitor the temperature of the case. Overheating in the first hours of operation can lead to piston bullying and the need to tear the cylinders.
The running time is usually 5 to 10 hours, and then it is recommended to replace the oil in the gearbox, as it could get water or metal shavings from the grinding gears. Whirlwind-25 and more powerful models require particularly careful control of the cooling system during this period, since the risk of overheating is higher due to the greater heat load.
Typical malfunctions and methods of their elimination
Despite the reliability, Soviet It's not without its disadvantages that come with age, and the most common problem is that it's leaky in the lower unit, and it gets into the gearbox, it emulsifies the oil, it destroys the bearings, and it's visually determined by the color of the oil (becomes milky) or by the water at the bottom of the gearbox.
The second scourge of these engines is carburetorOlder models tend to get icy plugs in the diffuser due to intense evaporation of fuel, which causes the engine to suddenly stop, solves the problem by installing a carburetor heating or using special additives in fuel, and often fails the crankshaft boulders, which leads to air sucking and impoverishment of the mixture.
- 🔥 Overheating - the cooling shirt is clogged or the impeller pump is faulty.
- 💨 Unstable idling - air sucking through the gums or contaminated with a chick.
- ⚡ Ignition skips - breakdown of high-voltage wires or malfunction of the magdinos.
- 🌊 Water in gasoline The leakage of the fuel system requires complete cleaning.
Diagnosis often requires dismantling of the knot, such as replacing the impeller with a water pump - a procedure mandatory once a season or when signs of overheating appear. Whirlwind-30 It has a more efficient pump, but it has higher demands for clean water intake, and rocks and algae can quickly disable it.
The secret of the durability of the gearbox
Many experienced motorists recommend lubricating the lower unit glands with a special lubricant before each long parking (for the winter), which prevents rubber from drying out and preserves the elasticity of the cuffs, which is critical to preventing water from entering the body during storage.
Tuning and modernization: is the game worth the effort?
Owners often wonder about upgrading their boat-engine vortexThe most popular type of tuning is the installation of electronic ignition instead of contact, which gives a spark of stable voltage at any speed, facilitates start-up and improves fuel combustion. The market offers ready-made kits that become regular places without drilling additional holes.
Another option is to redesign the exhaust system. Whirlwind-M It's quite noisy, and if you install resonators or change the geometry of the exhaust, you can reduce the noise, but you need to be careful not to disturb the purging of the cylinders, and some enthusiasts are also changing propellers to more efficient ones, which allows you to increase the speed of the boat by 2-3 km / h.
However, maximum speed of a motorized boat The vortex rarely exceeds 35-40 km / h Even after tuning, because the design of the lower unit and gear ratio of the gearbox have physical limitations, excessive forcing of the engine (spreading for more volume) often leads to a sharp decrease in resource.
The most efficient and safe tuning is the installation of electronic ignition and a high-quality carburetor, which gives an increase in power up to 10% without risk to the engine.
Comparison with modern analogues
Comparison Soviet It's difficult to do with modern Chinese or Japanese engines, because they're different eras, and modern motors are quieter, more environmentally friendly and more economical, they have catalytic converters, injectors (in expensive models), and they weigh less, but the price of a new 30 hp engine can be 5 to 10 times higher than the cost of a used vortex in excellent condition.
Main advantage vortex It can be repaired with a hammer and chisel in the remotest corner of the taiga, whereas a modern motor with an electronic control unit will require skilled service and spare parts.
The fuel consumption of the vortex is 20 to 30 percent higher than that of today's two-strokes and twice that of the four-strokes. But if you take into account the cost of the hour of operation, taking into account the cost of the engine itself and its maintenance, then the cost of the engine itself is the same. boat-engine It is one of the most economical options for irregular use.
Frequently Asked Questions (FAQ)
Which gasoline is best used for the vortex?
The AI-92 is the best choice. The AI-95 is not feasible because of the higher octane number that is not required for the compression ratio of the engine, and the AI-80 can cause detonation.
Why does the vortex smoke more than modern engines?
This is a design feature of older two-stroke engines, with the loss of some of the working mixture. In addition, older engines often require a richer mixture for cooling, which increases the amount of unburned oil in the exhaust. Over time, the carbon monoxide in the muffler also increases smoke.
Can I put a vortex on an inflatable boat?
Yes, but with limitations: The engines of the Virg-M series (20 hp) weigh about 37 kg, which is acceptable for large PVC boats. The more powerful models (25-30 hp) are already heavy for the inflatable transom and require a rigid hinged transom, which increases the overall weight and reduces the stability of the boat.
Where to find spare parts for the engine Whirlwind now?
Parts are still manufactured in various factories in Russia and China, and can be found in specialized water machinery stores, markets and the Internet, and the engine's popularity ensures the presence of piston groups, carburetors and lower units even 50 years after production began.