1. What are the advantages and disadvantages of SOHC in DOHC? Engine torque is the power to propel a vehicle, regardless of acceleration. On the slope, resisting air resistance at high speeds, all rely on engine torque. Horsepower is the physical quantity that multiplies the torque by the number of revolutions. Since horsepower includes the element of speed, it is suitable to describe the function of the engine to the vehicle. In the United States, since SIUNIT is not used, the torque is multiplied by the number of revolutions and also multiplied by one. Odd constants can become metric horsepower. Actually, horsepower is really as simple as the torque multiplied by torque. Only the number of revolutions is Radian Per Second and the torque is Nm. Bhp, ps, hp basically do not need to be converted, they all refer to horsepower. Even if the test method is different, it cannot be converted in any way. As for torque kgm and ib-ft can be converted and it is very simple. 1kg is equal to 2.2ib, 1m is equal to 3.29ft, so 1kgm is equal to 7.22ib-ft. It can also be said that 1ib-ft is equal to 0.14kgm. OHC is further developed on the basis of OHV, regardless of OHC thermal efficiency. horsepower. Fuel consumption. Balance is better than OHV. The main advantage of OHV is that it is cheap. If someone says to you that OHV will provide better torque, it is deceptive. OHC can be designed to have lower torque than OHV. The question is whether there is this need. Both Japanese JIS and German DIN test methods connect the engine to the Dynamometer instead of using a treadmill. The main difference between JIS and DIN is that JIS removes all the loads connected to the engine, so the measured value will be relatively large. The DIN engine will be connected to the Water impeller and motor, and the value will be smaller. Although the test principles of the two are similar, a power meter is used to measure the braking force, but we still cannot directly convert from JIS to DIN because the measurement machines of both are fundamentally different. PS is a common horsepower unit in Japanese books, but it does not mean that it is JIS. Usually, individual test methods will be explained separately. Bhp and hp are abbreviations for Brake Horse Power and Horse Power, and are relatively easy to understand. They are all horsepower units, and bhp means that the test is performed by braking an engine. In fact, using different methods to test, horsepower figures are only a few percent difference. Cylinder diameter x piston stroke is a way to describe the volume of the cylinder, compared to the direct write volume, this is more understandable engine design, but also shows some of the engine's basic characteristics, such as the value of the stroke is greater than the diameter, ie display The engine is heavier than the high-torque output; on the contrary, it focuses on the characteristics of the larger horsepower. The wind drum has several meanings in the automobile terminology. For example, the air filter housing, the vacuum servo brake servo booster, or the heavy-duty truck compressed air storage tank is called wind drum. Fire electrode electrode gap and the shape of the engine combustion chamber. Steam direction. Charging time in the ignition circuit, flashover voltage and so on are all related. The most common problem of unsuitable fire nozzle clearance is affecting the stability of idle speed and the output during high rotation. If you want to measure the gap to the hardware store to buy a Filler ruler measure Plug Gap, adjust the Plug Gap, can be used sharp nose pliers. If the engine's petrol supply, the ignition time is normal, and there is no internal wear caused by the oil into the combustion chamber, a set of fire nozzle can be used 20,000 kilometers. However, if you find that the engine is weak, ignition is difficult or there are abnormal changes, you should check the fire nozzle. Platinum is a heat-resistant, highly conductive metal that is of course suitable for making fire nozzles. Mushroom air flow is high, more suitable for high-speed driving. Dual-polarity burner, when the ignition jumps from the positive pole to the two ground poles at the same time, the spark coverage is relatively large, but because the power is divided into two, the energy of individual sparks is naturally halved. At the same time, the dual-polarity burner may also have a negative impact on the flow of air and combustion mixture in the engine. Therefore, the use of dual-polar burners should be related to the design of the engine. Now that your engine is a factory that requires the use of dual ground burners, it is naturally designed for use. There is indeed a difference between the number of hot and cold fire nozzle, it refers to the size of the insulation layer on the cathode, it will affect the electrode temperature when the torch working. However, the climate varies from place to place, and there is little temperature difference to the south. Unless the engine has carbon deposition problems, the model proposed by the manufacturer should not be changed. Fire nozzle line, the performance is not necessarily related to the diameter, low resistance and does not interfere with the radio, is a good fire Tsui. The difference between a rotary engine and a conventional reciprocating engine is that the part that generates power is a rotating rotor, not a piston moving up and down. At present, mass production of rotary engines for automobiles, only Mazda WANKEL ENGINE. The high-lift engine still uses the traditional four-stroke principle to generate power, that is, inhalation of gasoline in the air mixture, pressurization, ignition and combustion to generate power, and then discharge the exhaust gas. However, the four working sequences are achieved by the triangular rotor in a wide-opening [8] shaped cavity, eccentrically rotating to change the volume of the combustion chamber. The center of the triangular rotor connects a crankshaft passing through the rotor with a gear, and the eccentric motion is converted into a concentric motion and becomes the output power of the engine. The biggest advantage of a rotary engine is that it has few parts, small size and light weight. This is unmatched by the traditional reciprocating four-stroke engine, but its sealing problem can hardly be completely overcome, thus affecting efficiency and making the engine's low torque torque biased. Low, fuel consumption is also relatively large. Fast Cam, is a high-angle camshaft, from the front of the camshaft egg-shaped section is sharper, which means that the engine valve has a deeper angle of entry. That is, the amount and speed of cylinder intake/exhaust are increased, and the peak output of the engine is naturally increased. However, when the engine enters the fast CAM state at the beginning, the problem of low torque or cylinder explosion may occur due to insufficient pressure in the cylinder. Therefore, the CAM is only suitable for long-term high-speed racing vehicles. The Honda's famous VTEC system combines the fast CAM and the slow CAM, while taking into account the low speed and high torque. The purpose of fuel economy and strong horsepower. Wow, it is also known as fuel booster. The fuel pump has been running since the engine was started. When it is not stepping on the oil, it will return to the cylinder via the return valve: This small part functions to block the speed of the return oil and make the fuel in the fuel supply system (a part of the injection). There is more pressure. Then the fuel sprayed out will have stronger atomization effect, which directly improves the performance of the engine's detonation. It has obvious benefits for naturally aspirated engines, but it requires very careful adjustment before it can have fuel consumption. Significant increase in the situation. Using a larger exhaust hose will not reduce horsepower, but it will lower the torque of the engine. The torque of the engine at low turn depends on the degree of mixing of the air and fuel into the combustion chamber. To mix the two well, the eddy current when the air and fuel enters the combustion chamber is very important. The generation of the eddy current is based on the specific valve. The overlap time of the opening and closing and the pressure of the exhaust hose are designed. With the use of a large throat, the Back Pressure of the exhaust hose is reduced, and the original design will be disturbed and the mixture will be poorly mixed. Therefore, the big throat is used, in addition to the lowering of the torque. It will make the engine run at a low speed, and you may want to find a car with a big tail hose to cite. For mass-produced vehicles, the horsepower setting depends on many factors, such as noise, exhaust emissions, fuel consumption, low torque, and other practical factors. Of course, the horsepower figure is also very important for market strategy, but the road is walking. The car cannot always be as pure as a car. In fact, we have said it many times. Big horsepower is not a big deal. For example, DB7 and MODENA, as long as a slight modification, horsepower can also be greatly enhanced! 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The design of DOHC can make the angle of the flap more suitable for the shape of the combustion chamber, so the overall flap area can be increased, each flap is lighter, inertial mass is reduced, and the steam inlet efficiency can be improved. On the contrary, SOHC has only one camshaft, which restricts the angle of the flap. The basic inertness is high and the high-speed operation performance is inferior. However, because of its simple structure, maintenance costs are cheaper than DOHC.
2. What is the difference between torque and horsepower? What is the use of the two?
3. How are horsepower and torque units such as Bhp, PS, Hp, Ibft and Kgm converted?
4. What are the advantages and disadvantages of OHV and OHC?
5. What is the difference between DIN and JIS output values?
6. What is the cylinder diameter x piston stroke?
7. What is the wind drum?
8. Why do you need to maintain a specific nozzle gap for different kinds of fire nozzles? What are the gaps measured?
9. How often should fire beak change? Why does the torch need to be made of platinum?
10. What is the difference between mushroom and wind isolation?
11. What are the pros and cons of dual ground fire burners?
12. Does the fire nozzle have a tree, is it rougher?
13. What is a Rotor Engine?
14. What is the difference between the characteristics of a rotary engine and a normal engine?
15. What is FastCam?
16. What is the return valve?
17. Why does the change of the large-diameter exhaust hose reduce the performance of the engine head?
18. Only three liters of engine capacity of the F1 can emit about 900 horsepower. Why does the supercar not use the F1 engine?