English 
tachometer for small engines
In the instrument cluster, we can see that RPM occupies a large area, which is basically not smaller than the area occupied by the vehicle speed. What does this RPM mean? Being able to occupy such a large position proves that it plays a great role, and this RPM actually represents the engine speed. Theoretically, the higher the speed, the stronger the power, but it is not completely correct.
What does "rpm" on the dashboard mean? The full English name of RPM is "revolutions per minute", which represents the engine speed per minute. Generally speaking, the higher the speed, the stronger the engine power and the greater the torque. We should know that the engine drives the piston through burning air and gasoline, and then drives the crankshaft to run. This power is transmitted to the vehicle through power. The power converted into the crankshaft is torque.
Understand the tachometer to understand the engine. Tachometer is an indispensable device in center console, but it seems useless to most car owners. In fact, the tachometer can directly reflect the current condition of the vehicle. This is very useful. The speed of the engine crankshaft, a wheel in the engine, and the power is transmitted out by this. 7500r / M is 7500 revolutions per minute. The faster the speed, the greater the power and the greater the fuel consumption.
When the engine speed is lower than 1200R / min at the moment of ignition during cold start, it should be noted that this is a manifestation of poor engine working conditions. It is likely that the carbon deposition on the throttle valve is serious and needs to be cleaned. Try not to let the engine work below 2000r / min, because if the speed is too low, it will feel that the engine power is insufficient. If the load of the engine is too large at low speed, it will damage the engine and easily form carbon deposition. When the engine operates above 4000R / min, due to the shorter combustion time and insufficient fuel combustion, the fuel consumption will increase significantly. If the fifth gear is used for normal driving, the speed can generally reach 150km / h, which has reached a more dangerous speed. The engine operating at 2500 ~ 3500r / min is the most economical and the best working condition of the engine. The speed of the car should be kept within this range as much as possible to save fuel and power.
Get a Quote / Info