Knocking in the engine on the classics

For much of the life of the car, it is accompanied by background noise. Weak and strong, sonorous, and the deaf - they can not only reduce the comfort, but also annoying hearing. Often these sounds may indicate deficiencies in the aggregates and motor units. The car has a multitude of sources of sound - the steering, engine, chassis, powertrain. Despite all this, the engine here has a special place. Heavy loads experienced by the engine, are periodic alternating character in accordance with the speed with which rotates the crankshaft. This is not surprising that one piece 3000 rpm for at least an hour - it is very difficult, so here and there are frequent breakdowns and other unpleasant consequences. In this article we would like to elaborate on the knock in the engine on the classics. Often car owners worried about two issues: how expensive and difficult to repair and how you can go with a bang? The first question is more important for the mechanics, but give it a little differently formulate - which causes knocking in the engine on the classics? Correctly answering this question, we can easily put everything in its place - the complexity of the repair and the possibility of further operation without it. It so happens that give a concrete answer to the question of what could be the cause of knocking is not so easy. Even if qualified mechanic, he has extensive experience and "absolute" hearing, he may be mistaken. What is there to talk about the less skilled craftsman or as a driver? However, in this case, the cost of failure can be quite high. For example, a driver who is sure that nothing happens, adds volume and racing at high speed, and suddenly he takes off the connecting rod, punching block. Or the mechanic who thinks that the car needs a major overhaul of the engine, parses it, and understands that the reason was not in it. The most difficult thing without any disassembly and inspection units to understand what exactly the cause knocking. Not uncommon when a car mounted substandard parts that wear out quickly and led to a knock. But more often, the details of creating a knock wear because of their misuse. One of the most difficult to recognizable causes knocking are hidden defects, they may appear in an entirely different area, but to influence the sound of the engine. If you summarize, the occurrence of detonation is a case of "dark", and to understand the root cause is not easy. Therefore, we will try to provide some clarity. Since all the variety of knock is enough to describe the difficult, if not real, we'll describe the most common of them. What can depend on a knock? In any operation of the car can read that "the sound of Bearings better listening ..." etc. This is true, if you have a lot of time and only one machine. But in the same machine - totally different design features, and therefore cause various knocks and noise can be quite different under the same conditions. So what are the signs can be called a major? In our opinion there are several. For example, it is the nature of hammering - a periodic, regular, with some frequency, or chaotic. The latter will appear at intervals, and suddenly disappear, and therefore its dynamics is difficult to trace. If you knock on a regular, it can be attributed to the rotation of the crankshaft, while the frequency of knocking can be as identical with the rotation, and differ from it. Another option in favor intensity. To some extent, this option can be called subjective. One, it seems that the engine knocks quickly, the other thinks that knocks almost there. However, the main one here, this intensity is associated with the regime of the engine or not. Conditions of the engine determines the load and speed. The higher the speed, the higher the inertia of return parts that move. If the knock is due to their injury, then in such situations, it will intensify. The total engine noise can drown out the data knocks. Therefore, often defined as amplified sound of this is simply impossible. If we increase the load, it will lead to the fact that the pressure in the cylinder begins to grow, hence, increase the load on the parts are in motion (crank mechanism and piston group). In most such cases, the knock, which increases with increasing load, indicates that defects in moving parts. You probably have noticed that in describing the noise and the sound of the words we often operate with uncertainty. All this because often the cause of knocking ambiguous. Due to the fact that the degree of breakage of parts may be quite different, and the noise would not like to themselves. As practice shows on the classics, the knock may affect the increase in oil supply. For example, the greater the speed, the greater increases oil pressure and flow in the system, including it is sent to damaged parts. Since oil has some insulating effect, some knocks may subside, not even looking at that enhance the action of force. Therefore of great importance here will have a working temperature of the engine. Between broken or well worn parts, a thick cold oil can hold well. Therefore, a cold engine by ear can work almost perfectly. Temperature may affect not only the engine oil, but some of its parts. Since we must remember that they are all made of different materials, so have at different heating rates of expansion. Naturally, that heating the gaps between the mating parts may disappear. In the end we can say that for a correct diagnosis of him who knocks the engine often does it matter how the knock during the operation. Some kinds of knocks can be not the same throughout the period. Others start to progress. On the basis of this trait is often possible to narrow down the causes that could lead to the problem. The first is most often associated with deterioration of equivalent parts, but the latter - it's wear, most likely a soft material coupled with a firm.