How to evaluate free trade agreements

List of contents of this article:

• 1, Old Jetta engine intake branch Lv or Shuo material is better
• 2、Is the engine plastic still useful after the new car decoration
• 3, Is the engine hood better foam or hard plastic? Good

Old Jetta engine air intake branch LvThe better or the better material

1. The highly integrated valve chamber cover is a highlight of the EA211 engine. Generally speaking, the function of the valve chamber cover is the cover of the gas distribution mechanism, and the material is also plastic. EA211 adopts an aluminum alloy valve chamber cover and integrates the camshaft into it.

2. The engine technology is very good, and this car is very easy to use. Jetta's engine is the same as the ordinary 6 and 8 valves. The reason why the King of Jetta was called Wang was that the engine was the best 6-20 valve engine at that time.

3. The advantage of the synchronous belt is low noise. It is important to know that most of the noise generated by the engine comes from the valve mechanism. The disadvantage of timing belt is that it is not as reliable as timing chain. It needs to be checked regularly and replaced if necessary. In addition to the high integration of the intake system, the exhaust system is also integrated.

Is the engine plastic still useful after the new car is decorated

dustproof function. At the same time, after the plastic cover of the engine compartment, it can cover the dust for the engine, clean the engine, and avoid the harm of dust. Therefore, in order to make it inconvenient to check the engine, it cannot be removed casually. The plastic cover of the engine compartment is very useful. The contrast between the situation without the chassis cover plate and the situation with the cover plate is clear at a glance.

The engine guard plate can protect the oil pan of the engine and make the chassis more flat, which can improve the stability of the car's high-speed driving.

If the original car is only designed with a plastic protective plate, the choice of installation hole is relatively arbitrary. As long as it can be fixed, a good plastic shield is fine, and it does not need to have a strong load-bearing capacity.

Especially when the vehicle starts. To sum up, the engine lower guard plate does not need to be installed for most car owners. The original chassis of most cars is covered with a plastic lower guard plate, which I think is completely enough. The metal lower guard plate is only suitable for those vehicles that often run on construction sites or often drive in poor road conditions.

The function of sound insulation The plastic cover of the engine compartment has the function of sound insulation, which can greatly reduce the noise impact of the engine and improve the comfort of driving. The function of thermal insulation The engine compartment cover plate has a certain thermal insulation effect on the engine, which can shorten the time for the cold car to start the hot car, reduce fuel consumption, and reduce the engine carbon accumulation caused by idling.

As for the materials of the guard plate, it is now mainly plastic, aluminum alloy and steel plate. Steel plate is not recommended. The service life of plastic is not long. It is recommended to use aluminum plate, which is better in terms of weight and toughness.

Is the engine hood better foam or hard plastic

Hard plastic and resin protective plate. The price is relatively cheap and the production process is simple.

There is a foam layer inside the enamel, and the hardness of enamel is smaller than that of hard plastic. Because enamel is made of different materials, the manufacturing cost is higher than that of hard plastic. The outer skin of the enameled plastic material is made of polypropylene heating, the foam layer is used in the middle, and the hard plastic is made of plastic. There is a foam layer inside the enamel, and the hardness of enamel is smaller than that of hard plastic.

In addition, because the engine is working for a long time in the process of running, the engine will be hot. At this time, the plastic guard has a certain degree of thermal conductivity, which can make the heat dissipation of the engine better when used.

The hood on the car engine is generally made of rubber foam and aluminum foil. When reducing engine noise, it can simultaneously isolate the heat generated by the operation of the engine, effectively protect the paint on the surface of the hood and prevent aging. The function of the hood: air diversion.

Rubber foam cotton and aluminum foil materials. According to the query of the car configuration, it can be seen that the engine cover is made of rubber foam cotton and aluminum foil materials. When reducing engine noise, it can also isolate the heat generated by the operation of the engine, effectively protect the paint on the surface of the hood and prevent aging.

There is a foam layer inside the enamel, and the hardness of enamel is slightly lower than that of hard plastic. Due to the different materials used in enameling, it is natural that the system is a little higher than that of hard plastic. The outer skin of the enameled plastic material is heated by polypropylene, the foam layer is used in the middle, and the hard plastic is made of plastic.Most of the central consoles of the car are decorated with hard plastic. First, save costs.