What is the life of Honda's r 18a 1 engine?
What is the life of Honda's r 18a 1 engine?
The design life of Honda R 18A 1 engine is about fifteen years. Well maintained, it can be used for 20 years or even longer, and more than 600,000 kilometers is no problem; However, if it is not well maintained or not maintained at all, the condition of the vehicle will be very poor, and the life of the engine will basically end in about 10 years.
Honda R 18A 1 engine is imported from Japan and assembled in the engine workshop of China Dongfeng Honda Wuhan factory. R 18A 1 Engine has two sets of cams, namely high-speed cam and economical cam. When the engine is started or accelerated, the air intake efficiency is maximized and the maximum torque drive is realized. In high-speed cruise, when the engine is at low speed, the fuel consumption is reduced by delaying the closing of the intake valve and keeping a large throttle opening at low load.
In Honda's R 18A 1 engine, Honda has applied the third generation i-VTEC (Intelligent Variable Valve Timing and Lift Electronic Control System) technology, but the i-VTEC technology used in R series engines has some changes in control compared with the traditional i-VTEC technology. The traditional i-VTEC technology can prolong the closing time of intake valve and increase the intake air volume at high engine speed, thus making the downward torque curve climb to another peak. Therefore, it can be said that the original intention of VTEC is more to improve power and torque, so the high-speed area above 4000 rpm is another force point of Honda VTEC, but in Honda R 18A engine, i-VTEC mechanism is skillfully used to save fuel consumption. How many laps does Honda's vtec drive? I mean the eighth generation 2.0 Accord. I wonder how soon this engine can start. What's it like to start i vtec? Questioner: Huang Hui's best answer: At middle and low speed, the engine needs low mixture to keep the speed stable and reduce fuel consumption and pollutant emission. However, when the engine reaches a high speed, it needs more air intake to meet the demand of high power output, and the phase (opening and closing time) and lift (opening degree) of the engine intake valve are the most direct factors to determine the air intake of the cylinder. After the ordinary engine is manufactured, the valve timing and valve lift are fixed, which can not meet the requirements of intake and exhaust at different engine speeds. Therefore, people hope to have an engine whose cam profile (cam profile curve) can adapt to any speed and can obtain the best valve timing at high speed or low speed. Therefore, the variable valve timing control mechanism came into being. 1989, Honda introduced a self-developed electronic control system for variable valve timing and valve lift, which is called "electronic control system for variable valve timing and valve life" in English and abbreviated as "VTEC". It is the first valve control system in the world that can control the valve opening and closing time and valve lift at the same time. Like many ordinary engines, VTEC engine has four valves per cylinder (two in two rows), camshaft and rocker arm, but it is different from ordinary engines in the number and control method of cams and rocker arms. Low-angle cams are used at medium and low speeds. The valve timing and lift of the two valves are different at middle and low speeds. At this time, the lift of the valve is very small and hardly participates in the intake process. The intake port is basically equivalent to a single intake valve engine. At high speed, the VTEC solenoid valve controls the flow direction of hydraulic oil, so that the two intake rocker arms are integrated, and the valve is driven by the intake cam with the longest opening time and the largest lift. At this time, the two intake valves are synchronized according to the contour of the large cam. Compared with low-speed operation, the intake flow area and opening duration are greatly increased, thus improving the dynamic performance of the engine at high speed. Honda engineers realized these two completely different output curves on the same engine. However, in VTEC system, the change of valve timing is still phased, that is to say, the change of valve timing is only a jump at a certain speed, not a continuous change within a certain speed range. In order to improve the performance of VTEC system, Honda continuously innovated and introduced i-VTEC system. A device called VTC (variable timing control "variable timing control") is added-a set of variable control mechanism for camshaft timing of intake valve, that is, i-VTEC=VTEC+VTC. At this time, the overlap time between intake valve timing and opening is variable and controlled by VTC. The introduction of VTC mechanism makes the engine have proper valve timing in a wide speed range, which greatly improves the performance of the engine. However, riders should note that although the engine is also marked with bright i-VTEC, the i-VTEC of Dongfeng Honda Civic R 18A 1 engine has another meaning. The above i-VTEC mechanism is to improve horsepower output, but the function of this i-VTEC mechanism of R 18A 1 engine is to save fuel. The timing for VTEC to change to the above-mentioned large-angle cam is that when the engine reaches more than 4,800 revolutions, the water temperature is higher than 60 degrees, and the negative pressure index in the intake manifold reaches the factory set value, the VTEC solenoid valve opens, the oil pressure is introduced into the rocker arm to push the free piston, and the large-angle cam begins to intervene, thus prolonging the closing time of the intake valve and increasing the intake air volume at high engine speed. The driving timing of VTEC on R 18A 1 Engine is set in any speed range from 1000 to 3500 rpm, so intervention can be made. Beyond this range, no matter how high the speed is, the VTEC mechanism will not start again. Does this sound very different from the VTEC driving time mentioned above? And why can I change to a large angle cam in advance to save fuel consumption? The key is the control of intake resistance. Generally, when a gasoline engine is cruising at high speed and low load, because there is no need to increase the speed, the driver will only lightly step on the accelerator to maintain a constant speed, and the throttle opening will be relatively reduced (that is to say, high-speed cruising means that the throttle opening is very small), which will slow down the intake of fresh air. But at this time, due to the small throttle opening, the intake resistance in the engine will increase, the downward resistance of the piston will increase during the intake stroke, and some thrust will be consumed when the piston explodes. At this time, if the throttle opening can be increased, the suction resistance of the piston can be slowed down and the efficiency can be improved, so that all the output power of the engine can be used in the transmission system, and a part of the engine will not be consumed when driving, thus improving the fuel economy when cruising at high speed. The i-VTEC system of R 18A 1 engine is aimed at this situation. When the vehicle is cruising at low speed and high speed, it will involve a large angle camshaft, and the intake resistance can be reduced by increasing the valve opening. The i-VTEC system mentioned at the beginning of this paper can provide explosive power at high engine speed, while the i-VTEC system of this R 18A 1 engine does the opposite, intervening at low engine speed to achieve fuel-saving effect. Civic R 18A 1 engine has many technologies aimed at fuel consumption, such as piston oil cooling nozzle and variable length intake manifold, which will not be introduced in detail here. Conclusion: In the final analysis, Honda's i-VTEC technology is to change the original "unchanged" intake and exhaust valves into ones that can be adjusted according to the engine and vehicle working conditions. The benefits of this change can be imagined, just as the gearbox is upgraded from first gear to multi-gear. However, i-VTEC also has some obvious shortcomings, such as excessive engine noise when the valve is fully open. Although some people think that this obvious "VTEC" sound is very attractive, it will also have a certain impact on driving comfort. In particular, long-term use of large-angle camshafts will obviously increase fuel consumption. For example, the high-performance version of K20A engine, which has not been launched in China, has a displacement of only 2.0 liters, but there are multi-angle camshafts controlled by i-VTEC on both sides of the intake and exhaust, which leads to the fuel consumption of the engine approaching 2.5~3.0 displacement when driving at full speed. In addition, i-VTEC system needs the cooperation of complex ECU control unit, and the processing quality of operating parts is high, which requires manufacturers to make more efforts in quality assurance. I found it in the post bar. I hope it helps you. What is the life of Honda's r 18a 1 engine? How many revolutions does Honda's vtec drive @20 19?