Advertising Content: Lubrizol Diesel Additives

Cold weather diesel excerpts:

How additives improve the winter operability of diesel engines.

While the amount of wax in a diesel fuel is essentially determined by the type of crude oil, all diesel fuels contain wax. In colder temperatures, this wax begins to crystallize and join together, where it can clog fuel filters and disrupt fuel flow to the engine. At a certain point, diesel vehicles can essentially become inoperable.

Cold flow additives are common in higher quality diesel fuels to help lower the temperature at which waxes crystallize and combine. Diesel fuels with proven cold flow additives help improve the winter operability of diesel engines.

How additives improve the winter operability of diesel engines.

Modern diesel engines are complex, sophisticated machines that need higher quality fuels to keep them running their best. Injector deposits, fuel pump wear, corrosion, poor performance in cold weather — these are just some of the concerns of modern diesel engines. Without a high quality diesel fuel, engines are at risk, which may lead to higher emissions, reduced fuel economy, loss of power, poor vehicle response, and equipment downtime and/or repair.

Diesel additives allow fuel marketers to offer higher quality, differentiated diesel fuel to end users. Tested and proven deposit control additives increase the ability of a diesel fuel to clean injectors and keep them running like new. Additives also help improve cetane properties to deliver better cold starts and quieter operation. Lubricity additives provide wear protection reduced in the production of ultra-low sulfur diesel. Cold flow additives lower the temperature at which diesel gels and becomes problematic.

How additives improve the winter operability of diesel engines.

With the move to ultra low sulfur diesel in both on and off-highway diesel vehicles in recent years, polar components in the diesel fuel that provided natural lubricity to diesel engines were also removed in the process. With this lack of natural lubricity, diesel fuel pumps and injectors can see premature wear, affecting engine performance in the process.

Higher quality diesel fuels often contain lubricity additives to help restore the lost natural lubrication. Pump and injector wear is significantly improved, and engines are better protected to deliver lasting performance.

How modern injectors can suffer from internal diesel injector deposits (IDID).

Today’s modern high pressure common rail direct injection systems utilize advanced diesel fuel injectors that contain internal moving components that are significantly smaller, lighter, and more intricate than their predecessors. Unlike legacy diesel engines with unit fuel injectors that are mechanically driven off the cam shaft, the newer injectors are computer driven through electrical solenoid pulses to the injectors. While new injector technology offers some significant advantages for fuel economy and emissions, even small amounts of internal diesel injector deposits can cause moving parts to stick. In a more extreme engine environment, with higher temperatures, pressures, and increased injection sequences, dirty injectors are often unable to handle the demands of the engine.

Effective deposit control additives allow fuel marketers to offer higher quality diesel fuels capable of cleaning IDID and restoring diesel engine performance to like new condition.

How deposit control additives deliver optimal diesel engine performance.

Deposits on fuel injectors can cause significant losses in performance in diesel engines, especially in those more modern engines with high pressure common rail injection systems. Conventional nozzle tip deposits accumulate in and around the injector spray holes that direct fuel into the cylinder in preparation for combustion. These deposits affect the quality of the spray pattern, leading to less than optimal combustion efficiency. Internal diesel injector deposits, also known as IDID, are deposits that occur deeper inside the injector and affect the ability of moving parts to keep up with the demands of complex fuel injection sequences.

Higher quality diesel fuels contain deposit control additives that effectively remove both nozzle tip deposits and IDID, helping to return intended fuel delivery to the combustion chamber. This leads to engine performance improvements, such as restored power and fuel efficiency, reduced emissions, and overall better driveability.

What is cetane and how does it impact combustion?

As the piston rises in a diesel engine, air is compressed to very high pressures, which also generates temperatures capable of igniting diesel fuel. Therefore, combustion timing is controlled by when the diesel fuel is injected into the combustion chamber. In reality, the combustion does not start instantaneously. There is a relatively short delay between the initial injection of fuel and the start of combustion. This time delay, or ignition delay, is essentially the effect of the cetane number of a diesel fuel.

Fuels with higher cetane numbers have a shorter ignition delay and combustion begins sooner, and as a general rule, offer better engine performance. This can lead to easier starting, less white smoke on start up, less noise, and lower emissions. All diesel fuels have a given cetane number from their basic formulation. But often, fuel marketers use cetane improving additives to increase the cetane number to further enhance the performance benefits of their higher quality diesel fuels.

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