Automobile manufacturers are constantly on the lookout for savings so they can make their vehicles cheaper to produce, more competitive in the marketplace and more efficient. The aim is to make each engine as compact as possible but also able to produce an adequate amount of power for the particular market. As they strive for these goals, they need to make sure that the equipment fitted in and around the engine is of the highest quality, and if you are looking for replacement parts, you need to do the same. Why do you need to be particularly careful when you replace a common rail injection system, for example?
In a modern-day, fuel-injected engine, nothing is left to chance. The motor is engineered to perform with very narrow tolerances, and fuel must be delivered at extremely high pressure and at precisely the right moment. It is very important, therefore, to ensure that the design and build of a common rail injection system is first class.
Common Rail in Action
But what is the common rail? It is essentially a tube which acts as a delivery medium for the fuel. Fuel is pumped into the common rail under very high pressure and is then delivered to each injector at the right moment.
As you can imagine, this is a very volatile environment and all the parts involved are exposed to high levels of heat. This is why it is so important to ensure that the common rail and all associated parts are well-sourced and that you never make a shortcut when choosing a replacement. This way you get an injector you know will work well.
The metal used should be heat-treated and forged so that it retains its rigidity at all times. If the interior surface of the pipe were to lose some of its rigidity and even if that deficit were very small, then fuel distribution would be uneven. The engine would start to misfire, and while you might not notice in the early days, problems would inevitably accrue. If too much fuel is injected into a particular chamber at the wrong moment, it will burn off and cause an ashy deposit. This could block the very fine holes in each injector and exacerbate the problem.
If you need to replace common rail injectors or any of the associated parts, speak with a professional to get the right one for your vehicle.