oilless Turbos ??

Comp Turbo Technology Inc, continues to extend the boundaries of turbocharger technology by announcing the availability of what is believed to be the first commercial automotive turbocharger that does not require a lubricating oil supply from the engine. Lube oil supply and drain lines are no longer necessary and the Comp Turbo oil-less turbocharger can be mounted in a variety of positions and locations that were not possible when lube oil had to be gravity drained back into the engine crank case.

Historically, lube oil has been the source of a number of problems throughout the development of the small automotive turbocharger. The thick viscosity of lube oil in cold weather causes a significant time lag before oil reaches the turbocharger bearings. Repeated hot shutdowns of an engine can cause a buildup of hard carbon within the turbocharger's bearing housing. In addition, the piston ring oil seals used in commercial turbochargers have a small leak path that has caused a minor but persistent problem up to and including some current models. All these annoyances have been eliminated by removing the use of lube oil in the Comp Turbo oil-less turbocharger.

Designated the Model CT3B-OL, it employs the well proven, patented TRIPLEX CERAMIC™ bearing system with high temperature grease lubrication. Replacing lube oil with grease results in a lower friction loss in the bearing system allowing somewhat faster acceleration of the turbocharger rotor, which is quite advantageous in racing applications. Since the ball bearing carrier in the new oil-less turbo can be easily removed from the bearing housing as an assembly, the bearings can be re-greased at appropriate intervals, thereby extending their service life indefinitely.

Experience the acceleration of the new Comp Turbo oil-less turbocharger and compare its superior performance with competitive models. Contact Comp Turbo Technology, Inc. for more information of submit engine specifications so an experienced staff specialist can return a turbo model recommendation to meet your individual requirements.

COMP TURBO TECHNOLOGY, INC. OIL-LESS TURBO

A great deal of effort was expended in the early years of small turbocharger development to produce a bearing system that had sufficient durability to make them commercially viable. Research and development in the 1960's resulted in the perfection of shaft instability (oil-whirl) but had appreciable friction losses at their high speeds of operation.

Due to the friction losses in the floating sleeve systems that hamper the acceleration rate of the turbocharger rotating assembly, many attempts were made to use ball bearings in small turbochargers, all unsuccessful, until the TRIPLEX CERAMIC ™ ball bearing system was invented. This system consists of an elongated, rotatable steel cylinder with back-to-back angular contact ball bearings, mounted in the compressor end of the cylinder, that carry axial thrust in both directions, and a single angular contact bearing slidably mounted in the turbine end that carries no thrust. The turbine end bearing outer race bears against a preload spring that allows the bearing to move with axial expansion of the shaft. A small clearance between the outside diameter of the steel cylinder and the mounting bore in the bearing housing is supplied with the lube oil that protects the bearings from shock and vibration. This triple ball bearing system has been successfully used in commercial production by Comp Turbo Technology for over three years, has out-performed competition in stringent racing applications and has produced a large number of very satisfied customers.

Historically, the use of engine oil to lubricate the floating sleeve and stationary thrust bearings in commercial turbochargers have rise to a number of operational problems. To prevent oil leakage into the compressor and turbine casings, piston ring seals are employed in commercial turbochargers. Since the piston ring seals are not positive contact seals, there is a small leak path around the piston rings and, during certain operating conditions of the engine, i.e. low idle or a vacuum in the air intake system, some oil leakage can occur. Any ail leakage into the turbocharger casings can result in the undesirable emissions in the engine exhaust.

In cold weather, there can be a significant lag in the flow of oil to the turbocharger bearings when the engine is initially started. If the lag is long, the sleeve bearings can fail on startup.

Another problem can occur when an engine is shut down quickly after being operated at high speed and load where the exhaust gas temperature is maximized. Heat transferred into the turbocharger casings can cause residual lube oil in the bearing system to carbonize. This carbonization can build up and eventually cause failure of the bearings.

Notwithstanding the fact that years of development has mitigated the above named problems, there remained a motivation to remove the use of engine oil to lubricate the bearing systems in small turbochargers. Comp Turbo Technology has responded to this challenge by developing what is believed to be the first commercial turbocharger that does not require a lubricating oil supply from the engine. Lube oil supply and drain lines are no longer necessary and the turbocharger can be mounted in a variety of positions that were not possible when lube oil had to be gravity drained back to the engine crank case.

The Comp Turbo Technology oil-less turbocharger, employs the well proven TRIPLEX CERAMIC ™ ball bearing system, wherein the ball bearings are lubricated by high temperature grease. In the oil-less bearing system, the elongated steel cylinder is provided with axially spaces “O” rings in its outside diameter that engage the bore in the bearing housing. Cooling water is supplied from the engine to a water jacket in the bearing housing and to the space between the “O” rings. This cools the “O” rings and the bearing carrier, carrying away the heat generated in the bearings. Since the bearing system is easily removed as an assembly from the bearing housing, the bearings can be re-greased at appropriate intervals to extend their service life indefinitely.

Contact Comp Turbo Technology, Inc. for more information or submit engine specifications so an experienced staff specialist can return a turbocharger model recommendation to meet individual requirements.

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