Possession of powerful agricultural or construction equipment requires constant monitoring of the engine life, but a standard odometer often shows only the distance traveled, ignoring the intensity of the power unit. This is where the concept comes to the rescue. motor-clockThis is a universal indicator of wear mechanisms, regardless of whether the car was standing in place with a working hydraulic pump or racing along the track. Understanding the principle of transfer of these units of measurement is necessary for timely maintenance, accurate calculation of the cost of renting special equipment and an objective assessment of the residual resource when buying a used tractor or excavator.
Many owners mistakenly believe that one motor hour is always equal to one astronomical hour, but in reality this value directly depends on the turns of the crankshaft and the speed of the engine. speed vehicle movement. When working at idle speeds, the wear of parts is minimal, while operation at the limiting capacity burns the resource many times faster, which makes a simple recalculation by the clock incorrect without taking into account the speed mode. In this article, we will discuss proven conversion techniques that will help you avoid premature breakdowns and controversial situations with tenants.
What is a motor watch and why it is important for resource assessment
Momentum. It is a unit of measurement of the duration of operation of the engine, which takes into account not only the time, but also the load on the power unit during this period. Unlike the mileage, which can remain zero when the attachment equipment is stationary, the meter of the motor clock records the real resource production of the piston group, bearings and lubrication system. This is particularly critical for diesel-powered tractors and forklifts that spend a significant part of their time in PTO mode (power take-off shaft) without moving in space.
The main value of this indicator is the ability to plan the intervals of oil and filter change with high accuracy. If you focus only on kilometers, you can miss the moment of degradation of lubricants, since the engine could work hundreds of hours at high speeds, while covering a minimum distance. Modern telemetry systems automatically convert this data, but for owners of old-age equipment or simple models, manual calculation remains the only way to control it.
⚠️ Attention: When buying used equipment, always check the readings of the motorcycle clock counter with the real state of the engine. Digital indicators are often “twisted”, but the physical wear and compression of the liners cannot be hidden.
For correct accounting, it is necessary to understand that different manufacturers put different coefficients in their onboard computers. For example, in John Deere or Caterpillar Algorithms may differ from domestic ones MTZ or kirovtsevThis requires an individual approach to the analysis of operational statistics.
Dependence of the motor clock on the average speed of movement
The relationship between distance traveled, engine operating time and average speed is fundamental to understanding wear. Higher than higher. speedThe less time it takes the engine to overcome one kilometer, but the load on it at this point can be higher than when driving at low speed on increased gears. The formula of calculation is based on the fact that at a constant speed one motor hour is equated to a certain number of kilometers, but this coefficient is floating.
Consider a typical scenario: a tractor moves across a field at a speed of 10 km/h. In one astronomical hour, it will overcome 10 km, and the motorcycle clock counter will show 1.0 mph. If the same tractor is distilled along the road at a speed of 40 km / h, in one hour it will pass 40 km, but the wear of the engine will be equivalent, for example, 1.5 or 2 hours in terms of resource, although the time of operation will take exactly an hour. That's why. The translation factor directly depends on the average speed and load..
There is a common misconception that at high speeds the resource is spent more economically per kilometer. This is not the case: aerodynamic drag and high engine speeds lead to intense heating and accelerated oxidation of the oil. Therefore, when calculating the cost of a motor watch for rent, increasing coefficients for high-speed distillation are often used.
To determine the exact dependency, it is necessary to take into account the transformation gear ratios and the type of fuel used. Gasoline engines, as a rule, have a smaller safety margin at long loads compared to diesel-typeThis also affects the final calculation of the resource.
Formulas for converting a motorcycle clock into kilometers
To translate a motorcycle clock into kilometers, there is no single universal constant, but engineers have derived averaged formulas that allow you to obtain sufficiently accurate results for planning maintenance. The basic formula is as follows: K = M x Vwhere K is kilometers, M is a motor clock, V is an average speed. However, this formula works perfectly only under a constant speed, which is almost impossible in real conditions.
A more accurate approach takes into account the time-use-of-time and load factor. For wheeled vehicles, an empirical coefficient of 0.8–0.9 is often used in calculating the actual mileage. That is, if the engine worked 100 hours, and the average speed was 20 km / h, the real mileage may differ from the estimated 2000 km due to downtime, acceleration and braking.
It is important to remember the difference between calendar-hour and the hour. A calendar hour is 60 minutes of real time, whether the engine is running or not. The motor can be longer or shorter than the calendar depending on the speed. For example, when working at idling, 1 moto hour can be equal to 1.5-2 calendar hours, and at maximum power - 40-45 minutes.
For the most accurate data, keep your own work log, recording the hours of start and finish, as well as an approximate average speed for each day.
The use of averaged values allows you to quickly estimate the need for maintenance, but for legally significant calculations (for example, when writing off equipment or insurance cases), detailed telemetry is required.
Load factors: gasoline vs diesel
Differences in the design of internal combustion engines dictate different approaches to accounting for their resource. Diesel enginesHaving a large torque and safety margin, they often work in more intense modes, but with lower revolutions compared to gasoline analogues. This leads to the fact that one motor hour of a diesel engine can be equivalent to a greater mileage than a motor hour of a gasoline engine of similar power.
Gasoline engines are characterized by faster wear when working at high speeds, which is often found when driving at a high average speed. Therefore, when converting the watch into kilometers for gasoline equipment (for example, light utility cars or generators with gasoline engine) often use a reducing factor, so as not to overestimate the residual resource.
- 🚜 Diesel: 1 motor hour ≈ 25-30 km of run (at an average speed of 25-30 km / h).
- ⛽ Gasoline: 1 motor hour ≈ 20-25 km of run (at an average speed of 20-25 km / h).
- 🏗️ Fixed work: 1 hour = 0 km (mileage does not go, but the resource is consumed).
It is important to note that modern engine control systems (ECU) may independently adjust the clock counter according to the oil temperature and the lubrication system pressure. This makes old tabular methods less relevant to new technology, but indispensable for the fleet of age machines.
⚠️ Attention: Do not use the coefficients for diesel engines when calculating the life of gasoline generators or motoblocks. This will lead to a critical mistake in oil replacement planning and overhaul.
Table of conformity of motor clocks and kilometers
For a quick assessment of the state of the fleet of vehicles, it is convenient to use summary tables that demonstrate the relationship between the work in the watch and the approximate mileage depending on the average speed. The data in the table are given for standard operating conditions of wheeled vehicles of medium power.
| Average speed (km/h) | 100 motor hours (km) | 500 motor hours (km) | 1,000 motor hours (km) |
|---|---|---|---|
| 10 km/h (heavy work) | ~800 km | ~4,000 km | ~8,000 km |
| 20 km/h (fieldwork) | ~1,600 km | ~8,000 km | ~16,000 km |
| 40 km/h (transport) | ~3,000 km | ~15,000 km | ~30,000 km |
| 60 km/h (road) | ~4,200 km | ~21,000 km | ~42,000 km |
As can be seen from the table, the difference in mileage with the same engine performance can be enormous - from 8 to 42 thousand kilometers per thousand motor hours. This emphasizes the pointlessness of binding the maintenance only to the kilometer for equipment operating in a mixed cycle. Using such tables allows mechanics to quickly determine which technique requires attention in the first place.
When filling in accounting logs, sometimes there are difficulties with rounding values. It is recommended to always round in the big direction to create a small reserve for the resource and avoid working on the “tired” oil.
Practical advice on accounting of achievements
Competent accounting of the watch is not just bureaucracy, but a real way to save significant money on repairs. The introduction of a simple monitoring system allows you to identify anomalies in the operation of the equipment, such as prolonged warming up, unaccounted downtime or misuse of transport.
First, you need to decide on the method of data capture. This can be either a simple paper travel document or complex satellite monitoring systems (see below).GLONASS/GPS). The main thing is the regularity and honesty of records. The data must be checked with the readings of the devices on the technique.
☑️ Checklist of introduction of accounting of motor clocks
Particular attention should be paid to the equipment that works on a rotational basis. There is often confusion, whose watches to consider – the landlord or the tenant. Clear prescribing of terms in the contract, based on clear formulas of recalculation, will save from financial disputes.
The secret to a long engine life
Alternating operating modes prolongs the life of the motor. Long-term work at idle speeds (less than 30% of the load) leads to piston coking, and constant work at 100% power - to overheating. Optimal mode - 70-80% of the nominal power.
Errors in calculation and their consequences
The most common mistake is to ignore the operation of the engine at idle. Many operators believe that if the car is standing, the resource is not consumed. However, idleness - this is one of the most harmful regimes for diesel, leading to nagaroformation and liquefaction of oil with fuel. These hours should be counted with an increased coefficient.
The second mistake is averaging the performance across the park. One coefficient cannot be used for a light front loader and a heavy tracked excavator. The specific pressure on the details of the crank-shaking mechanism is different, as are the thermal regimes.
The consequences of incorrect calculation can be fatal: from a sudden break of the rod to the need for a complete replacement of the engine long before the depreciation period. The financial losses from downtime during repairs often exceed the cost of the engine itself.
Accurate accounting of the motorcycle clock, taking into account the average speed and load is the only way to predict the cost of maintaining equipment and avoid sudden breakdowns.
How often should you change the oil if the meter of the motor clock shows 250 and the mileage is only 2000 km?
You need to focus on the motor clock. 250 hours is the standard interval for many heavy diesel engines in heavy operation. Low mileage indicates that the technique worked stationary or at low speeds with high load, so the oil has already developed its life of additives.
Can I trust the readings of an electronic counter on old equipment?
It is not necessary to rely on the electronics of age-related equipment. Sensors could “glue”, and memory – reset. It is better to use a comprehensive assessment: oil analysis, visual inspection and comparison with travel lists.
Does the quality of the fuel affect the speed of the clock?
Formally, the meter of the motor clock counts only the time of work. However, poor fuel leads to detonation and overheating, which actually accelerates wear. In terms of the real life of the engine, one moto hour on bad fuel can be equal to two on good.