The issue of operating the outboard motor in maximum load mode worries every owner of the boat. gas-fisted It's essential to clean the engine of the swelling, and others believe that working at low speeds prolongs the life of the machine. Where is the truth? The answer depends on a variety of factors: the type of engine, its stage of life and operating conditions.
Modern production technologies Yamaha, Mercury or Tohatsu But if you've been cruising for years at only idle or medium speeds, getting to maximum power can be stressful for the system. combustion-box and the exhaust system.
In this article, we will look at when to "gas" and when it will lead to expensive repairs. piston-group and spark plugs, as well as give practical recommendations for the correct operation of your outboard engine.
Physics of the process: what happens at high speeds
When you open the throttle, more fuel-air mixture enters the cylinders, combustion occurs at higher temperatures and pressures, and this creates conditions where you can get more fuel-air mixture. garment (oil and fuel incomplete combustion products) start to burn out, and at low revs, the temperature in the cylinder is often not enough to completely burn out the mixture, leading to sediment formation.
High revs create a powerful exhaust stream that mechanically blows the accumulated dirt out of the exhaust. exhaustThis is especially true for two-stroke engines, where oil is mixed with gasoline, and if the engine has been running for a long time in a gentle mode, an oil emulsion can accumulate in the silencer, which impairs the permeability of gases.
But there's a downside to this: Excessive loads without sufficient cooling or with poor fuel quality can lead to a high-quality fuel. knock-off Metal parts expand, the gaps change, and if the engine is not prepared for these modes, the risk of piston bullying increases.
⚠️ Warning: Never go to maximum speed if the cooling system is not working properly or the water intake is full, and overheating at full load will destroy the engine in minutes.
The Myth of Excavating: Does Full Gas Help?
There is a strong belief among water-engineers that periodic full-gas burning replaces maintenance. Part of this is true, but only for fresh sediments. Old, fossilized sodium that has been accumulating for years will not just disappear. Moreover, a sharp jump in temperature can cause pieces of sodium to fall off and fall under the surface. piston-ring, causing bullies.
The self-cleaning process is only effective when the engine is running on quality fuel. If the engine already has problems with compression or mixing, adding gas will only make the situation worse. chemistry for engines.
For two-stroke engines, short-term speed increases are useful to prevent oil starvation of candles and remove excess oil from the silencer. Four-stroke units are less dependent on this process, but also need periodic loads to warm up and evaporate the condensate from the oil.
breaking in mode: why you can not immediately give gas
The new engine requires a special approach. break-in And you're rubbing the rubbing parts, the piston rings against the cylinder walls, the crankshaft necks against the liners, and if you keep the motor at high speeds all the time, the surfaces won't have time to wipe themselves evenly, and that will lead to mycosaders and lower compression in the future.
Instructions from manufacturers such as Honda or SuzukiIt's usually a work of up to 50-60% of the maximum with periodic short-term increases of up to 80%.WOT Wide Open Throttle is strictly prohibited in the first 10-20 hours.
Ignoring the rules of running is a sure way to reduce the life of the engine by 30-40%. Metal must "sit down" at gentle temperatures. A sharp surge in loads during this period can cause local overheating and deformation of parts that no further operation will fix.
☑️ Rules for proper breaking in
Effect of operating modes on engine life
Paradoxically, constant low-speed operation can be more harmful than periodic gasps. trolling Or slow-moving causes spark plugs to squirt and lacquer deposits, and the engine starts to "trouble," loses power, and increases fuel consumption.
On the other hand, constant work at the limit of capabilities (100% of gas for hours) also does not add life to the engine. The resource of crankshaft bearings and rods is consumed faster under such loads. The optimal mode (cruising) is about 70-80% of maximum power, in this mode the engine operates efficiently, burns carbon and does not experience exorbitant mechanical stress.
Using this margin is necessary to overcome excitement, wind or sharp acceleration: An engine that never runs above 50% rpm, over time, "lazy" and reacts less to the throttle.
| Mode of work | % of max. turnover | Impact on the garment | Recommendation |
|---|---|---|---|
| Idle move | 0-15% | It's accumulating. | Parking and manoeuvring only |
| trolling | 20-40% | It's building up slowly. | Reinvigorate periodically |
| Cruising move | 60-80% | Burn out. | Main traffic mode |
| Full gas. | 95-100% | It burns out intensely. | Shortly, for cleaning |
Two-stroke vs. four-stroke: Is there a difference?
The difference in design dictates different approaches to operation. two-stroke The oil burns with the fuel. At low speeds, the combustion may be incomplete, leading to the release of oil into the exhaust and the formation of resinous deposits. For two-strokes, periodic high-speed output is critical to cleaning the piston and exhaust windows from the sodium.
Four-stroke engines They have a separate lubrication system, and the oil is not involved in the combustion process (ideally), but if you work at low speeds for a long time, the condensate and fuel vapors that thin the oil can accumulate in the crankcase. lubricating.
Also worth considering is the cooling system. Many motors have a thermostat that opens at a certain temperature. At low revs, the motor may not go to operating temperature, operating "cold", which increases wear. cruising at high revs guarantees the opening of the thermostat and full circulation of antifreeze or off-shore water.
How to “burn” the engine: instructions
If you feel that the motor has lost its speed or has begun to work unstable on singles, you can carry out a preventive cleaning procedure. water-intake Clean and the cooling system is working properly.
Warm up the engine at idle speed for 3-5 minutes. Then slowly, without jerking, start increasing the thrust. Rate to 70-80% and walk in this mode for a couple of minutes. After that, you can briefly (for 10-15 seconds) open the throttle completely. Repeat the cycle 2-3 times.
Don't keep the engine full unless you need it, the purpose of the procedure is to raise the temperature in the cylinders and create a ripple of exhaust gases, not to reach a maximum speed. After the procedure, let the engine work for 2-3 minutes on idles to cool down before stopping.
⚠️ Warning: If you hear a ringing metal knock (detonation) when you add gas, immediately reset your speed. Further operation in this mode will cause the piston to burn.
Frequent errors in the operation of outboard motors
One of the biggest mistakes is lazy operation: owners buy a powerful engine, but 99% of the time they use 10% of its potential, which leads to the fact that by the middle of the season the engine is overgrown with tanning, the candles are covered with black plaque, and the boat stops glides where it used to be easy to go to mode.
At the other extreme, you're always on the edge, and some hydraulic motorists think that if the motor can, it should. bearing And the resource of any machine is finite, and aggressive driving reduces it by many times.
Don't forget the quality of the fuel, even the most reliable. Yamaha or Mercury The pump pumps the water and dirt in the tank at high revs into the cylinders at double the speed, causing water shock or abrasive wear.
Can I always walk on full gas?
Technically, modern motors can do this, but it's not recommended, and running at 100 percent power dramatically reduces the life of the bearings and increases fuel consumption, and it's only justified in sports or if you need to go quickly.
How often should I give full gas?
It is enough to do this once in several outlets on the water or after a long parking. 1-2 minutes of work at high speeds will help burn the scorch and clean the exhaust system.
Is it harmful for a new engine to work long on singles?
Yes, it's bad. Long-term idling (especially for two-stroke workers) leads to candles scoring and deposits. Periodically boost your speed even when you're parked.
Why does the engine smoke at high speeds?
Heavy smoke can indicate burning oil. In a two-stroke engine, it can be a sign of a rich mixture or ignition problems. In a four-stroke engine, it can be a sign of wear and tear on oil rings or caps.
Do I need to warm up the engine before going to the gas?
The cold metal has other thermal gaps, the sharp load on the cold engine causes accelerated wear, give the engine 3-5 minutes to work on the idles before starting.