The first hours of the new combustion engine And that's when you get what's called the frictioning of the parts, which is the perfect gap between the piston rings and the cylinder walls, and if you own a new piece of equipment, you're probably wondering how to prepare it. fuel-oil for this process.
Many beginners mistakenly believe that the standard 1:50 ratio specified in the manual for continuous use will be enough during the break-in stage, but this misconception can cost you a major overhaul. Flow-in mix requires an increased content of the lubricating component to protect parts from overheating and bullying in conditions of increased friction of new equipment.
In this article, we will take a detailed look at the chemical basis of oils, give accurate calculations of proportions for different volumes of the tank and consider the table, which will become your desktop guide. You will learn why modern synthetic compounds behave differently than mineral ones, and how to avoid fatal errors when you first start your work. boat-engine.
Physics of the process: why you need more oil
The process of working on the conjugated parts of the engine is accompanied by the release of a significant amount of heat. New metal surfaces, even after the factory grinding, have micro-units. At the moment of their interaction, there is intense friction, which must be compensated by a denser oil film. breaking in Always richer in oil than work.
If you use a standard ratio of 1:50 in the first hours of operation, the lubricating ability may not be sufficient to protect the piston group, which is especially true when working at high revs or under load. Two-stroke engine lubricated with oil dissolved in gasoline and burns with it, so the concentration of lubricant directly affects the temperature in the combustion chamber.
And it's also important to consider the quality of the fuel itself. AI-92 or AI-95 It has the ability to oxidize during long-term storage, which also affects the lubricating properties of the mixture. For running, it is better to use fresh fuel that was purchased no more than two weeks ago.
Lack of oil in the mix causes local overheating, which can cause bullies on the cylinder mirror, which is an irreversible process that requires remoulding or replacing parts. Excess oil, although less dangerous, can lead to coking exhaust ducts and the formation of scorching on the scorch. spark-plug.
Choosing the right oil: mineral oil or synthetic
The fuel and fuel market offers a wide range of products, and it is very easy to get confused in them. For two-stroke outboard motors, there are special standards, such as: JASO FD or ISO-L-EGDThese markings ensure that the oil has the necessary detergent and lubricating properties, as well as the ability to burn without forming large amounts of ash.
Mineral oils have traditionally been considered more suitable for older or air-cooled engines, but in a break-in context they are often preferred because of their thick oil film. Yamalube or Mercury QuicksilverThey provide better protection in extreme temperatures and smoke less.
- 🛢️ Mineral oils - create a thick protective film, ideal for running, but give more soak.
- 🧪 Semi-intelligent - compromise option, combining the protective properties of mineral water and the purity of synthetics.
- ⚗️ Full synthetics Provides maximum protection from bullies and minimizes smoke, but costs more.
When you choose a product, pay attention to the color of the dye in the oil. It's not just marketing, it's a way to distinguish the finished mixture from pure gasoline. If you see that the liquid in the tank is transparent, then you forgot to add the oil or you have confused the canisters.
⚠️ Warning: Never use four-stroke engine oils or transmission oils in a two-stroke engine mixture. They will not burn completely and will instantly disable the piston engine.
Modern synthetic oils often allow poorer mixtures (e.g. 1:50 or even 1:60) to be used already at the break-in stage, if explicitly indicated by the engine manufacturer. However, the classic school of water motors still recommends reinsurance and use a ratio of 1:40 or 1:35 for the first tanks.
Exact table of proportions for the preparation of the mixture
The most difficult thing for the owner is to correctly calculate the amount of oil per liter of gasoline. A mistake in calculating even 10-15 milliliters can significantly change the performance of the engine. breaking in with a high oil content (proportion 1:40, which is 25 ml per 1 liter).
For standard use, the ratio is typically 1:50 (20 ml per 1 liter), but for the first 5-10 liters of fuel, as mentioned above, we take a richer mixture. Use a measuring syringe or a special compartmentalized tank to achieve maximum accuracy.
| Volume of petrol (litres) | The required volume of oil (ml) at 1:40 | The required volume of oil (ml) at 1:50 | Recommended phase |
|---|---|---|---|
| 1 litre | 25ml | 20ml | Preparation of the test mixture |
| 5 litres | 125 ml | 100ml | First tank (break-in) |
| 10 litres | 250 ml | 200 ml | Second tank (break-in) |
| 15 litres | 375 ml | 300 ml | Third tank (transitional) |
| 20 litres | 500 ml | 400ml | Staffing operations |
Note that measuring tanks that come with oil are often calibrated only for large volumes. For accurate measurement of 25 or 125 ml, it is better to use a large-volume medical syringe or kitchen measuring cylinder.
There's a rule of oil first, then gasoline. By putting oil in an empty canister, you guarantee that when you add gasoline, you get a primary mixing, and if you pour gasoline and then add oil, it can stay on the bottom and not dissolve evenly.
Step-by-step instructions for fuel preparation
The quality of the mixture depends not only on the proportions, but also on the mixing technology. Just splashing the components into the tank and chatting the boat is the way to uneven lubrication and risk to the engine. You'll need a clean gasoline canister or a special mixing tank.
The cooking process must take place in a well-ventilated area or outdoors, away from fire sources, gasoline vapors heavier than air and can accumulate near the ground, creating explosive concentrations.
☑️ Checklist for mixture preparation
Once you've poured the ingredients, you need to shake the can for 15 to 20 seconds, which will ensure that the solution is homogeneous, and if the mixture lasts for a few days, there may be a dissection of the components, so you need to shake the canister again before each use.
It is recommended to store the finished mixture for no more than one month. Over time, gasoline loses its octane properties, and oil can precipitate or change the chemical composition. For running a new engine, always prepare a fresh portion of fuel immediately before getting on the water.
⚠️ Warning: Do not store the mixture in transparent plastic water bottles in direct sunlight. Ultraviolet destroys the structure of gasoline, and plastic can emit harmful substances that clog the fuel system.
Engine operating modes during break-in
Properly cooked breaking in The second half is in the engine mode, the first 5-10 hours (or 2-3 full tanks) of the engine should be running in a gentle mode, which does not mean that the engine should be protected as a crystal vase, but it is too early to "gas".
The main purpose of running is to let the parts get dirty together, and if you keep running at idle speeds, the rings won't work on the cylinder walls all over the area, and if you give it full gas, you'll get bullies, you'll have to have a gold variable load mode.
On the first tank, it is recommended to keep the speeds in the range of 30-40% of maximum power. Avoid prolonged operation in one mode. Periodically (every 5-10 minutes) briefly increase the thrust to 50-60% so that the rings spread out and take the correct position in the grooves of the piston.
- 🚤 First hour. - work at 30% of power, frequent change of turns.
- ⏱️ Second hour. You can briefly increase to 50%, avoiding full throttle.
- 🔥 Third hour and beyond - gradual increase in load, access to planing modes.
You should pay special attention to cooling. Make sure that the control trickle of water is stable. When running on a rich mixture, the engine can work a little softer and quieter, but temperature control is mandatory. Overheating during this period is critical.
For owners. Yamaha, Tohatsu or Suzuki Often, the recommendation is not to hold the gas handle in one position for more than 10 minutes. Variate the load, mimicking real-world swimming conditions: acceleration, wave, anti-current.
Typical errors and troubleshooting
Even experienced water-engineers sometimes make mistakes that can shorten the life of a new engine, and one of the most common is the use of old gasoline from last season, which has already started oxidation processes, and it will not provide a stable combustion.
Another common problem is greed when mixed: trying to save 100 rubles on oil and pour it on the eye often leads to expensive repairs, remember that the cost of a piston group is not comparable to the price of a liter of quality oil.
And the problem is that if you just add components to the tank of the boat and you just talk it overboard, that's not enough. The fuel in the tank can dissipate, and the engine will first get clean gasoline and then concentrate oil, and this will lead to uneven operation.
Watch the color of the exhaust. Blue smoke is normal for a two-stroke, especially when running on. But if the smoke is black and thick and the engine loses traction, the mixture may be too rich or the carburetor settings are broken (if it is mechanical).
⚠️ Warning: If you hear a ringing knock during the break-in, or the motor stops pulling abruptly, immediately silence it. Continuing to work even for 10 seconds can lead to a jamming of the piston.
Completion of break-in and transition to operating mode
After 3-5 tanks of the enriched mixture are developed, you can switch to the standard proportions specified in the instructions for your particular engine. This is usually a ratio of 1:50. However, if you operate the boat in difficult conditions (constant full load, cargo transportation), many craftsmen recommend not to go to 1:50, but to stop at 1:40-1:45 on a permanent basis.
At the end of the break-in, it is advisable to replace the spark plug, even if it looks working. Nagar formed during the laundry period can prevent spark formation in the future. The new candle will ensure stable start and smooth operation at idle.
Don't forget that different brands of oils can have different bases. It's not recommended to mix mineral oil with synthetic oil in one tank, although modern additives are often compatible. It's better to roll the tank to the end and pour a new mixture with another type of lubricant.
Your engine is now ready to go full-time. breaking in And compliance with loads in the first hours is an investment in reliability, which will pay off the lack of repairs for many seasons.
FAQ: Frequently asked questions
Can I use car oil for a two-stroke engine?
Absolutely not. Automotive oils (for four-stroke engines) contain additives that do not burn completely, and their use in a mixture with gasoline will lead to rapid formation of soot, coking of piston rings and engine failure.
How long can the finished fuel mixture be stored?
The recommended shelf life of the mixture is no more than 1 month in a tightly closed metal or special plastic canister in a dark cool place.
Do I need to warm up the two-stroke engine before starting?
Yes, you must. Give the engine 1-2 minutes of idling after starting, which will allow the oil to spread evenly through the friction nodes and warm up the piston group before applying the load.
What if I have mixed proportions and poured too little oil?
If you notice this before you start, just add the estimated amount of oil and shake. If the engine has been running on a poor mixture (low oil) for a short time, listen carefully. If you have knocks or loss of power, drown out. If there are no symptoms, add the oil to the tank for the next cycle.