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270 Degree Thrust Bearing |
Generally a standard thrust bearing as used by the manufacturers. A horse shoe shaped flat bearing allowing the collar to be fitted through the 90 degree section missing. Oil is fed from the bearing housing directly through small galleries within the bearing to the thrust pads on either side of the bearing. |
Standard Thrust Bearing, Horse Shoe Type Thrust Bearing |
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360 Degree Thrust Bearing |
Increasing the boost pressure above normal can put excessive axial loading on the standard thrust bearing and cause premature wear and eventual turbo failure. A 360 degree thrust bearing can be fitted as an aftermarket upgrade to help retain reliability. Being a full circular bearing, these not only have more surface area but are normally bolted down onto the bearing housing. The standard thrust bearing in a T3 turbo (for example) is held in place by a radial spring. This can give way and allow the bearing to lift if the boost pressure goes to high. Some manufacturers including KKK (Borg Warner), IHI and others use 360 degree bearings as standard in some models. However, it has to be said that the bearing is only ever as good as the oil supporting it. 360 thrust bearings can fail in just the same way as a standard bearing if the oil is the wrong viscosity, contaminated of lacking the correct pressure. If the oil film ‘shears’ then the metal surfaces of the collar and the bearing come together and wear very quickly. |
Uprated Thrust Bearing |
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AR |
A/R describes a geometric characteristic of all compressor and turbine housings. It is defined as the inlet cross-sectional area divided by the radius from the turbo centerline to the centroid of that area. |
A/R, Air Ratio, Aspect Ratio |
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A/R |
A/R describes a geometric characteristic of all compressor and turbine housings. It is defined as the inlet cross-sectional area divided by the radius from the turbo centerline to the centroid of that area. |
AR, Air Ratio, Aspect Ratio |
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Air Ratio |
A/R describes a geometric characteristic of all compressor and turbine housings. It is defined as the inlet cross-sectional area divided by the radius from the turbo centerline to the centroid of that area. |
AR, A/R, Aspect Ratio |
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Aspect Ratio |
A/R describes a geometric characteristic of all compressor and turbine housings. It is defined as the inlet cross-sectional area divided by the radius from the turbo centerline to the centroid of that area. |
AR, A/R, Air Ratio |
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Actuator |
Normally a pneumatic device that is used to open and shut the wastegate valve. It simply consists of a diaphragm seated above a steel cup with a spring below it, all held in a sealed capsule. The cup pushes on a rod that protrudes out of the bottom of the capsule. More modern types use stepper motors and some even 'talk' to the vehicles E.C.U. |
Wastegate Actuator, Wastegate Cannister |
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Wastegate Actuator |
Normally a pneumatic device that is used to open and shut the wastegate valve. It simply consists of a diaphragm seated above a steel cup with a spring below it, all held in a sealed capsule. The cup pushes on a rod that protrudes out of the bottom of the capsule. More modern types use stepper motors and some even 'talk' to the vehicles E.C.U. |
Actuator, Wastegate Cannister |
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Wastegate Cannister |
Normally a pneumatic device that is used to open and shut the wastegate valve. It simply consists of a diaphragm seated above a steel cup with a spring below it, all held in a sealed capsule. The cup pushes on a rod that protrudes out of the bottom of the capsule. More modern types use stepper motors and some even 'talk' to the vehicles E.C.U. |
Actuator, Wastegate Actuator |
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Actuator Bracket |
Fixing system for integral wategate actuators. Bracket attached generally to the compressor housing of the turbo to which the wastegate actuator is fitted either by bolts or spot welding. |
Wastegate Bracket |
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Wastegate Bracket |
Fixing system for integral wategate actuators. Bracket attached generally to the compressor housing of the turbo to which the wastegate actuator is fitted either by bolts or spot welding. |
Actuator Bracket |
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Adaptor Ring |
An adaptor ring is the circular plate that allows different model size compressor housings to be used on certain units. For example an adaptor ring is used to step up from the compressor flange on a T25 unit to allow fitment of a T3 housing, making it the ‘hybrid’ T28. Similarly there are adaptor rings that are used on the new GT ball bearing units. All of them up to GT40’s use a centre housing that has a compressor flange the same as an old T25 unit. With an adaptor ring, these can be converted to fit many different compressor housing from the T3, T35, TO4B and TO4E range. By means of clamp plates, the compressor housing bolts onto the adaptor ring, which in turn is held onto the bearing housing with a single large circlip. |
Adaptor Plate |
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Adaptor Plate |
An adaptor ring is the circular plate that allows different model size compressor housings to be used on certain units. For example an adaptor ring is used to step up from the compressor flange on a T25 unit to allow fitment of a T3 housing, making it the ‘hybrid’ T28. Similarly there are adaptor rings that are used on the new GT ball bearing units. All of them up to GT40’s use a centre housing that has a compressor flange the same as an old T25 unit. With an adaptor ring, these can be converted to fit many different compressor housing from the T3, T35, TO4B and TO4E range. By means of clamp plates, the compressor housing bolts onto the adaptor ring, which in turn is held onto the bearing housing with a single large circlip. |
Adaptor Ring |
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Aftercooler |
Like a water radiator expect that instead of water passing through it to be cooled, the hot charge air from the turbo passes through it. As the air is cooled, its desity increases and that means more oxygen is available for the engine to burn the fuel. Get the mixtures correct and you have more power. As with most things with turbos, 'big is best' does not always apply. Careful matching is required for optimum results. |
Intercooler |
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Intercooler |
Like a water radiator expect that instead of water passing through it to be cooled, the hot charge air from the turbo passes through it. As the air is cooled, its desity increases and that means more oxygen is available for the engine to burn the fuel. Get the mixtures correct and you have more power. As with most things with turbos, 'big is best' does not always apply. Careful matching is required for optimum results. |
Aftercooler |
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Aftermarket |
Word used commonly to describe the market for sales and repair of turbos and other vehicle parts after cars have fallen outside and warranty periods. |
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Air Flow Map |
A diagramatic representation of a radial compressor's flow rate against pressure ratio, showing rotational speeds, volumetric efficiency and other data. |
Compressor Flow Map, Flow Map |
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Compressor Flow Map |
A diagramatic representation of a radial compressor's flow rate against pressure ratio, showing rotational speeds, volumetric efficiency and other data. |
Air Flow Map, Flow Map |
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Flow Map |
A diagramatic representation of a radial compressor's flow rate against pressure ratio, showing rotational speeds, volumetric efficiency and other data. |
Air Flow Map, Compressor Flow Map |
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Aircooled Turbo |
A turbochrger that has no additional cooling other than the air around it and the oil passing through it. |
Oil Cooled Turbo |
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