Bosio DLC 1019 (ULSD RATED) - Single Nozzle [EC-5]

ULSD (Ultra Low Sulfur Diesel) Rated Nozzles

ULSD aka "Ultra Low Sulfur Diesel" has brought about a new set of challenges to the Diesel Injection Systems industry. ULSD specifications more specifically "ASTM-975 1.1.4- S15". 

ULSD Rated Nozzles are unique in that they are built around an ultra-hard "Diamond Like Carbon" coating aka "DLC". DLC provides a 'Diamond like' surface with superior surface qualities in respect to smoothness and uniformity that greatly reduce sliding friction. This allows the nozzle's needle to cycle faster, with improved fuel quantity control through better needle response. 

Another key benefit of DLC is that it results in a 50% or more increase in component life when compared to a non-DLC nozzle type running ASTM 975 ULSD fuel. A nozzle is comprised of two precision-made pieces, a high nickel alloy nozzle, and a high carbon steel needle. A non-ULSD-rated nozzle suffers from the effects of reduced lubricity as a result of the loosely controlled lubricity specifications under ASTM 975. Because of this, there is a wide range of actual fuel quality from one retailer to another. 

Unfortunately, wear is greatly increased due to reduced lubricity on the internal sliding surfaces. More specifically, ULSD fuel increases the wear rates in the needle support regions which over time (3,000-4,000 running hours) leads to decreased nozzle performance. As wear increases, the gap between the needle and nozzle widens fuel (pressure and volume)leaks back into the injector, and power and efficiency are lost due to the poor pressure response of the injector nozzle. 

DLC increases the hardness of the needle sliding surfaces thus increasing its service life by reducing the sliding friction and increasing the hydrodynamic support that the needle utilizes to remain centered in the nozzle bore. 

ULSD nozzles carry a small premium over the non-DLC types but with nearly double the service life (or more) of the nozzle, your direct savings are realized not only through greater durability but also improved function of the nozzle meaning better fuel economy and lower emissions all of which translate into greater longevity of your diesel engine.

All of our Bosio VE nozzles ship with new OEM sealing washers included.

Nozzles Explained: Please click here to read the fact sheet.

The key advantage to a DLC coating is the superior sliding surface it creates between two moving parts. This allows significant reductions in friction and far greater durability due to reduced reliance on the lubricity of the fuel. 

Standard Needle and Nozzle

A standard needle is uncoated and relies on the end result of the precision machining. This leaves very slight imperfections in the surfaces that increase the reliance on the fuel to prevent wear. Also this slightly increases the friction and thus lowers the response time of the needle, consequently lowering its overall efficiency.