1
Why?
One reason
after a long car parked, engine oil in the oil pan and back into the lower portion of the engine. So start the engine after a long-lost vehicles (such as overnight), the upper half of the engine when it is not in oil, lack of lubrication conditions. Takes about 30 seconds after launch, will be due to the operation of the oil pump and the oil delivered to the engine lubrication is most needed pistons, connecting rods and the crankshaft and other components. But even after a start the engine immediately hit the road, they do not pedal to the metal racing to maintain low speed, the effect is the same and idling.
for two reasons
engine operating temperature in less than before (about 90-110 degrees Celsius), its fuel supply system due to temperature is still low, are unable to effectively complete gasification gasoline (I believe we all know liquid temperature increases to boiling point becomes gasified). When gasoline was not yet gasification “wet” liquid, it is not easy to start the engine’s combustion. In this case it is up to the barrier effect of the damper, to prevent part of the air entering the cylinder, to enhance the mixing ratio of gasoline / air and to increase the engine speed so that the engine will not stall. After reaching the normal operating temperature, automatic choke naturally due to mechanical action and return to normal state; and a manual choke car be sure to remember to choke back, or because of the oil / gas mixture ratio is too high, not only a waste of gasoline, horsepower inadequate and incomplete combustion of gasoline will be black smoke. A cold engine to reach normal operating temperature range will take about seven or eight to ten minutes, depending on the different types of vehicles may be; and during this time, do not need situ hot car, they do not travel at high speed on anyway.
for three reasons
about the gearbox change gear lubrication, which is most people do not know the best and most easily overlooked. Transmission gear oil and engine oil is the same place: in the cold car gear oil flows to the lower part of the gearbox. Only when the road will be due to the operation of the gear and the gear oil from the bottom of the band, lubricate the upper half. This is also the reason why most car jerky shift in the cold car. It is not a way to solve situ hot car can be solved. Because there is no gearbox and gear pumps, only in situ hot car engine moving, the rest did not move in, Only to wait until after the fact the road, driving slowly for some time to improve this situation.
2
how to do?
in situ hot car idling it is not necessary
because of limited effect, but also a waste of time and petrol (plus air pollution). When the case and the engine idling idling gasoline also may be generated due to incomplete combustion of carbon, more harm engines. Worse still, some owners also like to pedal to the metal at idle idling, disturbing their sleep early in the morning did not say the move is to make rapid engine wear, serious damage to the engine parts, nothing to gain, too these people do not know so what purpose?
low rotation creep
Therefore, the correct method of hot car, the road should be 30-1 seconds after launch. But then do not to travel at a high speed, should be maintained at a low vehicle speed, engine speed to no more than 3000 to 3500 turn limits. Generally kept 2000 rpm. Otherwise, seek temporary fast, engine and gearbox are subject to intense wear and tear, but can not be restored. After the engine temperature rises to a normal operating temperature, and then restore the “personal habits” of the driving method can be.
summer and winter requires hot car
winter warm-up time longer than the summer. After standing overnight the engine lubricating oil each friction surface has disappeared, lost protection film; low temperature causes an increase in viscosity of the lubricant, adhesion and flowability deteriorates, increasing the resistance when the engine is started. At this time driving, will increase the load on the engine, add unnecessary wear and tear. Research shows that authority, accounts for about half of the engine wear at cold start of the entire amount of wear. Normal idle speed warm-up can reduce this wear and extend engine life. At low temperatures, the metal will show less elastic and abrasion resistance, and only in the normal operating temperature of the engine to reach normal with the gap, maintain the best working condition.
hot car time is not as long as possible
In fact, as long as the engine is able to achieve stable and normal idle onYou can travel up. Before carburetor engine reaches operating temperature, fuel system often does not work, the choke must be opened hot idling vehicle, or else it will speed instability even stall. Push back choke the engine idle smoothly, you can start driving. Some use advanced engine technology EFI vehicle, the fuel injection nozzle sophisticated computer accurate, high degree of atomization of fuel, only a short time after the start, the machine speed can be stable and to achieve the specified idle speed value, EFI car hot car time not too long.