The situation when the battery discharged at the most inopportune moment, familiar to many motorists. You can hear the click of the starter, and the engine does not show signs of life. In such cases, the time-tested method comes to the rescue - engine start-up. pusher. This action requires physical strength or the help of others, as well as a clear understanding of the mechanics of the process. The correctly selected gear plays a decisive role here, since it depends on it whether the engine will have time to spin to the necessary turns and ignite the fuel-air mixture.
Inexperienced drivers often make the mistake of pushing the car at second or third speeds, which leads only to a waste of energy. The mechanical transmission is arranged so that the gear ratios directly affect the force transmitted to the crankshaft. Injection Engines and older carburetor engines may require different approaches, but basic principles of physics remain the same. Understanding how the gears of the gearbox interact when the wheels are rotating will allow you to start the car on your first try.
In this article, we will discuss in detail why a certain gear is optimal, how to prepare the car for the procedure and what you can not do so as not to damage the car. GRMA or catalytic converter. You will learn about the nuances of launching front-wheel drive and rear-wheel drive cars, as well as how to protect yourself and others. Proper execution technique is the key to successful start and save the life of your vehicle intact.
Process Physics: Why Transmission Choices Are Critical
To understand what gear is best to start a car, you need to refer to the basics of the manual transmission. When you turn on the gear, you connect the output shaft of the box to the engine input shaft through the gear system. Transfer ratio Determines how many revolutions the engine will make in one wheel rotation. In the first gear, this number is maximum, which means the greatest effort, but also the greatest resistance to rotation.
When starting from the pusher, the wheels of the car act as a flywheel, transferring the energy of rotation to the crankshaft. If you turn on the first gear at once, the resistance to turning the engine will be so great that the wheels can simply go yuz (locked) during the push, not allowing the engine to spin. Diesel Engines with a high degree of compression resist turning even more strongly than gasoline analogues.
That is why the choice of transmission is to find a balance between the necessary force to turn the engine and the ability to accelerate the car to the desired speed. A gear too high (4th or 5th) would require a very high speed of movement to create enough revolutions on the crankshaft for a flash. Too low (1st) will create excessive resistance. The middle ground is usually the second or third gear, depending on the engine size and type of drive.
⚠️ Warning: Attempting to start the engine with the first gear on a slippery road (ice, snow, dirt) is almost guaranteed to lead to locking of the driving wheels. The car won't go, and you'll only damage the tires or the parts. transmission.
The best gear to start: second or third?
There is a long-standing debate among experienced drivers and mechanics: which gear is better for a run - a second or a third? The answer depends on several factors, including engine volume, ambient temperature and condition. starter (Or rather, their absence in the process). Let’s analyze the arguments for each option so that you can make an informed decision in a critical situation.
The inclusion of a second transmission is the most common recommendation. In this gear ratio allows you to easily spin the engine even at a relatively low push speed (about 10-15 km / h). This is especially true for cars with a small engine capacity (up to 1.6 liters) and in warm weather, when the oil in the engine has not thickened. Carburetor Models often require this approach to create a powerful spark and fuel supply.
A third transmission may be preferred in the following cases:
- 🚗 Large engine capacity: For engines with a volume of 2.0 liters and above, the resistance to turn is higher, and the third gear will reduce the load on the pushers.
- ❄️ Low temperature: In winter, the oil thickens, and the engine is harder to turn. The third gear reduces the risk of wheel locking.
- 🏎️ High acceleration speed: If the car is accelerated to 20-25 km / h, the third gear will allow more efficient use of inertia.
However, it is worth remembering that in the third gear it is required to develop a higher speed so that the number of engine revolutions reaches a value sufficient for starting (usually 50-100 rpm for the start of ignition). If you push will be one person or the terrain does not allow you to accelerate, it is better to stop at the second gear. The main thing is the sharpness of the clutch, which we will talk about below.
Why not the fourth and fifth?
In the fourth and fifth gears, the gear ratio is too small. To spin the engine to the desired speed, the car would have to accelerate to 40-50 km / h, which in a city or narrow road is dangerous and inefficient. The energy of the push simply will not have time to transfer to the crankshaft in the required volume.
Step by step instructions: how to start the car correctly
The process of starting the engine from the pusher requires clear coordination between the driver and assistants. Chaotic movements can cause injuries or damage to the car. Below is an algorithm that maximizes the chances of success. Before you start, make sure you have at least one, or better yet two, assistants ready to push the car.
The car must be prepared first. Make sure that the gear lever is in the neutral position (Neutral). Turn on the ignition by turning the key to the position when the indicators on the dashboard light up, but the starter is not yet spinning. This is necessary to activate the ignition system and the gas pump. If you have a carburetor car, you may need to press the gas pedal several times or pull out. sucker.
☑️ Preparation for launch from the pusher
Then comes the acceleration phase. Ask the assistants to start pushing the car. As soon as the car reaches the speed of the pedestrian (5-7 km / h), the driver must smoothly but quickly release the clutch pedal until the moment of grasping. You will feel a characteristic jerk and hear the engine start to turn. At this point, you can not release the clutch completely!
As soon as the engine "captures" and there are steady turns, immediately squeeze the clutch back so that the car does not twitch forward and knock down the pushers. Let the engine warm up at idle speeds. If the first time failed, repeat the procedure, perhaps changing the transfer. For injector It is important not to "gas" the engines much at the time of start-up, since the electronics themselves regulate the mixture.
⚠️ Warning: Never try to jump into a moving car through an open door at high speed. It's deadly. The door shall be opened only during acceleration and the driver shall take his seat and slam the door before the gear is turned on.
Features of launching different types of engines and drives
Not all cars respond equally to pusher launches. The design features of the engine and the type of drive make their own adjustments to the procedure. For example, rear-wheel drive cars (classic VAZ, old BMWs) are often started easier, since the mass above the driving wheels is less, and it is easier to turn them. Front-wheel drive machines have a large load on the front axle, which increases rolling resistance.
Diesel engines require a special approach. Due to the high degree of compression, it is much more difficult to turn them manually or from a pusher. A diesel engine often requires a higher acceleration rate and the use of a third gear to reduce drag. It's critically important. lamp-light - in the cold season without their preliminary warming up to run diesel from the pusher is almost impossible.
The table below gives recommendations for choosing a transmission depending on the type of car:
| Type of vehicle | Recommended transfer | Required speed | Features |
|---|---|---|---|
| Small car (up to 1.4 l) | Second (II) | 10-12 km/h | Easy to turn, less risk of wheel locking |
| Middle class (1.6 - 2.0 L) | Second (II) or Third (III) | 15-20 km/h | Depends on the temperature of the oil and the condition of the battery |
| Diesel cars | Third (III) | 20-25 km/h | High torque and pre-heating required |
| Rear-wheel drive | Second (II) | 10-15 km/h | Less transmission resistance |
It is worth mentioning cars with special catalytic converter. In case of unsuccessful attempts to start a part of the fuel mixture may not burn and get into the exhaust system. Repeated attempts can lead to a saturation of the catalyst with unburned fuel and its failure. Therefore, make no more than 3-4 attempts in a row, giving the system to blow.
If you have an injection car and the battery is completely dead (the bulbs don’t burn), the gas pump may not work. In this case, the launch from the pusher is impossible without pre-charging the battery or replacement.
Common mistakes and security measures
Failure to comply with safety precautions when starting from the pusher can lead to unpleasant consequences. One of the most common mistakes is trying to start the car in the transfer, when the key is not turned into the ignition position. In this case, the spark will not appear, and all efforts will be wasted. Always check the position of the key before starting the movement.
Another common mistake is to throw the clutch sharply at high speed. This can lead to a load on the elements. transmission, break the belt of the timing (especially on diesel engines) or even jamming the engine. The clutch must be released confidently, but not thrown like a hot stone. Smoothness at the moment of grasping is the key to success.
It is also dangerous to leave the car unattended with the gear on and the engine running, especially in winter on a slippery surface. The car can spontaneously move. After a successful start, always use the parking brake.hand-hold). Remember that the generator will start charging the battery only after a set of certain turns, so let the engine work for 10-15 minutes before the trip.
- 🛑 Steering lock: Make sure the steering is not locked by the lock. This happens if the ignition is turned off, turn the steering wheel before clicking.
- 🔥 Starter overheating: Although the starter is not involved in this method, do not confuse it with a regular start. If you alternate methods, let the starter cool down.
- 🚧 Venue: Do not try to start the car on a busy highway or on a steep descent without control. Choose a safe area.
⚠️ Attention: It is strictly forbidden to start cars with an automatic transmission from the pusher (DISTRIBUTION). In such transmissions there is no rigid connection between the wheels and the engine with a idle engine, and an attempt to push will only lead to overheating of the oil in the automatic transmission and expensive repairs.
The success of a pusher launch depends on the correct transmission (usually 2nd or 3rd), sufficient acceleration speed and serviceability of the ignition system. This method is not suitable for automatic transmission.
Frequent questions about engine start (FAQ)
Can I start the injection engine from the pusher?
Yes, you can. Injector engines are even easier to start carburetor, since the electronics accurately dispenses fuel. The main condition is the presence of a minimum battery charge to work electronics and gasoline pump. If the battery is dead, the pump will not turn on.
Will a launch from a pusher damage the gearbox?
If done correctly (without blows and sharp clutch throws), there will be no harm. However, frequent use of this method can accelerate the wear of synchronizers and a two-mass flywheel. This is an emergency measure, not a regular operation mode.
How many people do you need to start a car?
For a passenger car with an engine up to 1.6 liters, 2 people are usually enough. For heavier SUVs or in winter, 3-4 people may be required. You can also use acceleration from a slide or towing other cars (with caution).
What if the car does not start with the pusher?
There may be several reasons: lack of spark, malfunction of the gas pump, problems with GRM or too thick oil. If after 5-6 attempts the engine did not start, further actions are meaningless and require diagnosis. You may need to replace the battery or repair the ignition system.
Can I start a pusher car on gas (HBO)?
Yes, you can. The launch must be made on gasoline. The electronics of the gas equipment will automatically switch the fuel supply to gasoline at start-up. Do not try to start the engine immediately on gas - this is impossible and dangerous for the gearbox.