Soviet boat-engine Whirlwind 45 It is considered a legend of domestic boating sports and amateur fishing. Despite its age, these units still plow the expanses of rivers and lakes, proving their durability and maintainability, owners appreciate them for their simplicity of device, availability of spare parts and the ability to develop impressive speed even on heavy housings.
But operating old people in modern environments requires a deep understanding of their mechanics and designs, not just a vehicle, but a monument of a time that requires respect but a rigorous approach, and in this article we will explore all the nuances, from technical parameters to the secrets of resource extension.
Many people mistakenly believe that maintenance of such equipment is the lot of professionals, but the reality is that any handy fisherman is able to keep the unit in line. The main thing is to know the weak points and not ignore the first signs of malfunction. Let's dive into the world of two-stroke classics.
Technical specifications and design features
At the heart of this mechanism is a two-stroke, two-cylinder carburetor engine, with a cylinder capacity of 904 cubic centimeters, which allows up to 45 horsepower to be removed from the crankshaft at 5,000 rpm, powered by a sophisticated purge system and high-quality aluminum alloy casting for its time.
The ignition system here is contact magnetic, which is both a plus and a minus of the design, on the one hand, it does not require an external power source and is independent of the battery when it starts, on the other hand, it requires regular cleaning of the contacts and adjusting the gap, which adds to the hassle of the owner.
The fuel system is based on two K-36 carburetors or modifications that provide a mixture. Whirlwind 45 It operates on a mixture of gasoline A-76 (according to the old GOST) or modern AI-80 with engine oil in a ratio of 1:25 or 1:30 depending on the running mode and the quality of the lubrication.
The water-gun cooling system is based on the principle of taking water through the intake in the lower unit, and the water passes through the cooling shirt of the cylinder block and is ejected through the control hole, which allows you to visually assess the pump. Overheating threatens to blow pistons, so control of the water stream is mandatory.
A critically important parameter is the weight of the engine, which is about 78-80 kg in the ready-to-work state.This makes it heavy enough to be mounted on lightweight inflatable boats, but ideal for metal "Kazak" and "Cruze".
- 🚀 Engine type: two-stroke, gasoline, carburetor
- ⚙️ Number of cylinders: 2, in-line location
- 💧 Cooling system: forced, off-board water
- ⛽ Fuel: a mixture of gasoline and oil in a ratio of 1:25
When using modern AI-92 or AI-95 gasoline, be sure to add two-stroke oil for high-forced engines to avoid detonation and soaking on candles.
Advantages and disadvantages of operation
The model's greatest asset is its phenomenal maintainability, and the design of the engine is so simple and logical that it allows you to replace a piston group or crankshaft bearings right on the shore of a reservoir with a minimum set of tools, and parts can be found even in the most remote parts of the country.
But there are some major drawbacks to be made: high noise and vibration levels are the cost of two-stroke cycles and no balancing shafts, long transitions on such a motor can be tiring for passengers and require a reliable transom attachment to avoid resonant vibrations of the boat hull.
Fuel consumption is also a downside: In a mixed cycle, the engine consumes 15 to 20 liters of the mixture per hour at full gas. For modern four-strokes, this is a lot, but for two-stroke classics, such appetite is the norm dictated by design.
⚠️ Attention: Due to the high vibration level, regularly check the condition of the motor mount bolts to the transom and the integrity of the lower unit.
Despite its archaic nature, the motor has excellent low-speed traction, which is important for trolling or anti-current movement, it does not stall when a sharp gas discharge occurs, and it can work for a long time at low speeds without significant coal formation if the fuel mixture is correctly selected.
Maintenance and regular maintenance
And boat-engine Whirlwind 45 It's been true for years, and you have to follow the maintenance regulations, and you have to first lubricate the bottom crankshaft bearing and the needle-shaped rod bearing, and you add a certain amount of oil to the gasoline, which burns with the fuel.
Regular replacement of spark plugs and cleaning of contacts of the interrupter is the key to stable spark formation. The nagar on candles will tell about the state of the engine: black velvety soda indicates a rich mixture, and white or light gray - about poor, which is dangerous overheating.
The cooling system must be washed with fresh water after each foray into a salty pond or in mud-covered areas, and clogging water channels with sand or algae is the most common cause of overheating and subsequent costly repairs.
Once a season, it is recommended to remove the lower unit and lubricate the slit joints and ossels with special water-resistant lubrication, which will prevent corrosion and jamming of the gearshift mechanism.
☑️ Seasonal engine maintenance
Frequent malfunctions and methods of their elimination
One of the most common problems is power loss and inability to develop full speed, most often it is a leaky crankcase or sucking excess air through the crankshaft glands, the engine starts to run on a poor mixture, which leads to overheating.
Knocking at the bottom of a lower unit usually indicates wear on bearings or rod fingers, and ignoring this symptom can cause the rod liners to roll and jam the crankshaft, requiring extensive repairs with waste.
Problems with gear shifting are often associated with the adjustment of the cable or wear of the friction linings of the clutch. In this case, the motor may “grow”, but the boat will not gain speed, since the rotational energy is not transferred to the propeller.
| Malfunction | Probable cause | Elimination method |
|---|---|---|
| The engine won't start. | Lack of spark or fuel | Check candles, contacts, presence of mixture in the tank |
| The engine is dead on singles. | Idle-walker jams clogged. | Clean the carburetor, blow out the jellybrae. |
| Vibration is strong. | Imbalance of the propeller | Replace or repair the screw, check the lower unit |
| Overheating of the engine | Failure of the pump or clog | Replace the impeller, clean the cooling channels |
⚠️ Warning: If you knock in lower unit, immediately shut down the engine. Further work "by ear" is guaranteed to destroy the shaky-piston group.
The secret of stable work of carburetors
Many owners are unaware that the shut-off needle oxidizes in the float chambers of K-36 carburetors over time. For prevention, it is recommended to replace the needle once a year or carefully polish its brass part with small sandpaper to ensure that the fuel overlap is tight.
Tuning and modernization for modern conditions
Many enthusiasts don't stop at factory design and implement improvements, and the most popular type of tuning is the installation of an electronic ignition system (EIZ), which allows you to get rid of the contact group, improve the reliability of start-up and stability of the engine in all modes.
The exhaust system is also in demand, with additional mufflers or reconfiguration of the exhaust windows reducing noise significantly, making fishing more comfortable, but it is important not to create excessive back pressure that will suffocate the engine.
Some craftsmen are experimenting with the shape of the propeller, installing faster models with a larger pitch, which allows for a squeeze of 2-3 km / h speed, but requires caution not to overload the engine and not go into cavitation.
Upgrading the cooling system by installing a more productive impeller or increasing the diameter of the water intake holes helps to better cope with thermal stress, especially in hot weather or when driving against the current.
Installation of contactless ignition system is the most effective investment in the modernization of the vortex, increasing reliability by 80%.
Tips for choosing a propeller
The right screw is the science of unlocking the potential of an engine. Whirlwind 45 The standard is considered a propeller with a diameter of 280-290 mm and a step of 300 mm. However, for heavy boats or full load, the step can be reduced to improve thrust, and for lightweight planing bodies - increased for maximum speed.
The material of the screw also matters: Aluminum screws are cheap and easy to repair (boil), but they are less efficient and prone to cavitation erosion. Stainless steel is more expensive, but provides better hydrodynamics and durability.
It's important to monitor the blades. Chipped, bending or cracking breaks the balance and creates a beat that is transmitted to the lower unit and the boat's trawler. Regular inspection and correction of the screw is a mandatory procedure.
When choosing, consider the number of blades. Three-blade screws are faster, but have less traction at the bottom. Four-blade screws, on the contrary, provide better acceleration and handling, but can slightly reduce the maximum speed.
- 🔩 The diameter of the screw must comply with the manufacturer's recommendations (usually 280-290 mm)
- 🌊 The screw's pitch is matched by the weight of the boat and the task (thrust vs speed)
- 🛡️ Steel screws last longer, but aluminum screws are easier to repair
⚠️ Attention: Installing a screw with an excessively large pitch on a weak or worn motor will lead to the engine operating in overload mode, which will cause rapid wear of the piston group and overheating.
FAQ: Frequently asked questions
Which gasoline is best used for vortex 45?
The engine was originally designed for A-76 gasoline. In modern conditions, the optimal use of AI-80 is allowed, but the use of AI-92 and AI-95 is allowed, but requires an increase in the proportion of oil in the mixture and precise adjustment of the carburetors to avoid detonation.
Why does the engine smoke blue smoke?
Blue smoke is normal for a two-stroke engine, as oil burns in the combustion chamber, but if the smoke becomes very thick and black, it indicates a re-enriched mixture or wear of oil removable rings (if any) or oil glands.
How often do I need to change the Bearings in lower unit?
When used actively and lubricated properly, bearings last 3-5 seasons, but if the motor is overheated or water is leaked through the coils, replacement may be required sooner, and backlash shafts should be checked annually.
Can you remake the vortex 45 for a four-stroke cycle?
It's theoretically possible, but it's not economically and technically feasible, and it would require a complete replacement of the crank-and-rotor mechanism, a valve head, and a change in the kinematics, and it would be easier to buy a four-stroke motor.