The question of choosing the right one fuel For water technology, it is often a stumbling block for both beginners and experienced water-engineers. Many boat owners mistakenly believe that any gasoline poured into a canister at the nearest gas station is equally good for their expensive equipment. carburetorfuel system and piston group.
Ignoring the manufacturer's recommendations can lead to detonation, the formation of scoop, or, worse, to hydrolysis and corrosion of internal parts. AI-92 from AI-95 In the context of outboard motors, how to properly store the mixture for two-strokes and why modern additives have become a necessity, not a luxury.
Understanding the physical and chemical properties of gasoline will help you avoid costly repairs in the midst of navigation, and let’s delve into the technical details that are hidden behind the simple procedure of filling the tank.
Basic requirements for gasoline for water technology
The foundation of your motor's long service is to use fuels that meet the manufacturer's specifications, and in the vast majority of cases, for outboard motors, whether they're in the process of being a motor. Yamaha, Tohatsu or SuzukiUnleaded gasoline with an octane rating of at least 90-92 is required according to the research method. Using fuel with a lower octane number causes detonation that destroys the pistons and valves.
Lead, which is still found in some remote areas or in private sellers, is strictly prohibited. Lead not only poisons the catalysts in four-stroke engines, but also forms conductive sock on the ground. spark-plugThis leads to disruptions in the ignition system.
- 🛑 Prohibited use of leaded gasoline - it kills catalysts and candles.
- ⛽ The octane number must strictly comply with the manual requirements (usually 92-95).
- 💧 The fuel must be clean, without visible impurities of water or rust.
It is also important to consider that outboard motors often operate in modes other than automotive: long-term operation at full speed (planing) or, conversely, long hours at low speed (trolling) create different temperature regimes, so the quality of combustion of the mixture is critical to prevent overheating or, conversely, “refrigeration” of the engine.
⚠️ Warning: Never use gasoline that has been in the canister for more than one season without canning. Oxidation products and resins that precipitate can coke the carburetor's jelly in a matter of hours.
Specificity of two-stroke engines: gasoline and oil
Owners of two-stroke engines (2T) face the additional task of preparing the right fuel mixture. Unlike four-stroke analogues, where the oil is in the crankcase, in 2T engines, the lubrication is carried out with oil dissolved directly in gasoline. The mixing ratio is usually from 1:25 to 1:50, depending on the particular model. motor and the type of oil used.
The quality of the oil itself is as important as the quality of the gasoline. TC-W3 They burn almost completely, leaving a minimum of sodium. Using mineral oils or oils of the old standard (TB, TA) can lead to rapid coking of the exhaust windows and loss of power.
The mixing process also requires technology. You can't just throw the oil in a full tank and hope to mix it when the engine is running, so you pour half the gasoline in the tank, you add the whole oil, you shake it thoroughly, and then you add the rest of the fuel, and you ensure that the lubricating components are evenly distributed.
☑️ Fuel mixing rules
Don't skimp on oil by trying to reduce the concentration of oil in the "smoke reduction" mixture, which is a direct route to the bullies of the piston group. Lubricating properties in a two-stroke engine - the only protection of rubbing pairs from dry friction.
The problem of ethanol and modern additives
One of the main problems with modern fuels is the ethanol content (alcohol), which in many countries, including Russia, often contains up to 10% or more of bioethanol, and poses two serious threats to outboard motors: hygroscopicity and aggressiveness to rubber seals.
Ethanol absorbs moisture from the air. When the water concentration in the fuel exceeds a certain threshold, the mixture is dissected: the water-alcoholic fraction settles to the bottom of the tank. Because water is heavier than gasoline, it is this aggressive slurry that first enters the tank. carburetor or fuel ramp, causing corrosion and engine shutdown.
| Type of supplement | Function | Frequency of application |
|---|---|---|
| Stabilizer | Prevents oxidation during storage | When conserved or long, simple |
| Dehydrator | It binds water and removes it when it burns. | Every time you fill up with a questionable fuel |
| Injector cleaner | Dissolves lacquer deposits | Every 5-10 hours |
To combat these phenomena, the market offers a wide range of additives. The use of fuel stabilizers is mandatory if the boat will stand still for more than 30 days. They do not allow light fractions of gasoline to evaporate, and resinous substances to precipitate.
In addition, dehydrator additives allow you to safely burn small amounts of water entering the tank, turning it into steam. However, it is worth remembering that no additive will save the engine if a liter of clean water is splashed in the tank.
Fuel storage rules for boats
The shelf life of gasoline is limited. Even under ideal conditions, the fuel begins to degrade after 3-6 months. When stored in a plastic canister in the sun, this process is accelerated by many times due to temperature changes and condensation. For boaters, this means that the fuel left over from last season is likely only suitable for combustion in boilers or requires careful filtration and inspection.
The best solution is to use specialized canisters approved for storage of fuels. They are made of materials that do not react with gasoline, and have a design that minimizes the formation of vapors and condensate. Metal canisters are preferable to plastic ones, since they better shield temperature fluctuations.
What happens to gasoline when it is stored?
Over time, the lighter fractions of gasoline evaporate, leaving behind heavier, tar components, which, when burned, form a solid sodium that clogs the rings, valves and exhaust system, and oxidation leads to increased acidity in the fuel, which causes the tank and fuel lines to corrosion from the inside.
Keep fuel in a cool, dark place, away from sources of fire and direct sunlight. the tank of the boat for the winter is better left full (with the addition of a stabilizer) to minimize the area of contact of air with fuel and prevent condensation on the walls, or drain completely if the design of the engine allows you to completely drain the system.
Filtration and cleaning: Protecting the fuel system
Even the cleanest gasoline with a good gas station can get contaminated during transportation or storage. Dust, fine shavings, rust particles from old tanks are all potential enemies of precision fuel vapor. fuel-filter It's not an option, it's a necessity.
Modern motors are equipped with multi-stage filtration, usually a separator with a sump (water-fuel separator), a fine cleaning filter on the engine and a grid in the fuel tank. Regular replacement or washing of these elements is part of the basic system. That.
- 🔍 Visually check the separator separator separator before each release to the water.
- 🛠 Change the thin-cleaning paper filters according to the regulations (usually once a season or 100 motor hours).
- 🧼 Wash the net in the tank when symptoms of engine starvation appear.
If you notice that the engine starts to stall at high speeds or loses traction, the first thing you need to do is check the fuel system. Often the problem is solved by replacing a penny filter, but ignoring this can lead to the failure of the fuel pump or injectors, which cost tens of thousands of rubles.
Take a transparent hose and pear with you, and you can quickly pump fuel from a suspicious canister through an additional filter funnel directly into the tank, weeding out the water and dirt.
Typical errors in refueling and operation
The statistics of service centers show that a large part of the breakdowns associated with the fuel system are due to the owners themselves. The most common mistake is to refuel in hot weather. Gasoline expands when heated, and if the tank does not have an air cushion, the excess pressure can damage the valve or lead to a transfer of fuel through the respiratory valve, which creates a fire hazard situation.
Another mistake is mixing gasoline from different brands or manufacturers by eye, and although chemically similar, different additive packages can react with each other to form unstable compounds, and it is better to minimize the tank and refuel with new fuel than to risk.
⚠️ Warning: Don't try to reanimate old, cloudy gasoline by mixing it with fresh 1:1. This will only prolong the degradation process, but it won't restore the octane number or remove the resins. This fuel can only be used for household purposes, but not in the engine.
Also worth mentioning is the error of ignoring seasonality: Winter gasoline, which is evaporated for cold start, in summer can cause steam jams in the fuel line, especially in hot weather, the engine will stall and refuse to start after a short stop.
The golden rule of water engines is that fuel quality is more important than its octane number. A fresh AI-92 with a good refueling is better than an old AI-95 with an unknown storage history.
Frequently Asked Questions (FAQ)
Can motor gasoline with an octane number of 95 be used in a outboard motor designed for 92?
Yes, you can. Modern outboard motors have knock sensors that adjust the angle of ignition, and AI-95 gasoline has a higher knock resistance, which is even useful in hot weather or when working under load for long periods, as long as it is unleaded.
How long can you store a mixture of gasoline and oil?
The finished mixture is recommended to be used for 2-3 weeks. After that, the oil begins to precipitate and lose its lubricating properties. If you plan to store the technique longer, it is better to drain the mixture or use special long-term stabilizers, but even with them, the shelf life rarely exceeds 1-2 months.
Why does the engine stop after winter storage, even if the tank had fuel?
Most likely, the lighter fractions of gasoline have evaporated, and the remaining resins have coked into the carburetor's jellyboxes or injectors, and it's also possible that the fuel will split and water will enter the system, requiring a complete purging of the fuel system, replacing the filters, and probably cleaning the carburetor.
Is bioethanol harmful to older outboard motors?
Old rubber seals, hoses and diaphragms of carburetors (especially those produced before the 2000s) can swell, crack and break down under the influence of alcohol. For such a technique, it is advisable to look for ethanol-free gasoline (AI-92 Ecto often contains less alcohol or special aviation/boat fuels), or regularly change rubber elements to compatible ones.