Anatomy of a Turbo
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Joined: Jan 2004
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From: Baltimore, MD, U.S.
Anatomy of a Turbo
The Compressor Wheel
Many times you may here people referring to the compressor wheel being from a particular family of wheels.You may have heard something like "thats a to4e
wheel or that's a TD05 compressor wheel."In most cases,a turbocharger manufacture will make a number of compressor wheels within the same "family" of wheels.Allwheels in the same famialy will share the same outside or majoir diameter,same bore diameter,number of blades and blade aerodynamics and shape.The differnces,between the wheel in the same family,are generally with the minor diameters,or in somecases,the height of the blades.Although a change in tip height may be reason enough for the manufactor to classify the compressor wheel in a differnt family altogether.Many times you will here the term "trim".The trim of a compressor wheel refers to the relationship between the areas of the major and minor diameters of the wheel.A 50-trim wheel will have an area at the minor dimeter that is ane-half or 50-percent of the area of the area at the major dimeter of the wheels.A 40-trim wheel would have a smaller minor diameter that provides an area that is only 40-percent of the area at the major diameter.If you know the major and minor diameter of a particular wheel,you can determine the trim by using the following formula:
trim=[Minor Diameter]^2 /
[Major Diameter]^2]x100
let's say we have a wheel with a 3-inch major diameter and a 2-inch minor diameter.We would just need to take the squre of the minor diameter[2x2=4]anddivide it by the squre of the major diameter[3x3=9].the result of divided by 9 would be .444. Multiplying this by 100,would end up a trip of 44.4 this would be rounded up to a 45-trim compressor trim.The trim is not the ratio of the diameters of the major and minor measurements.it's the ratio of the area and that's why the equation uses the squre of the diameters.
Many times you may here people referring to the compressor wheel being from a particular family of wheels.You may have heard something like "thats a to4e
wheel or that's a TD05 compressor wheel."In most cases,a turbocharger manufacture will make a number of compressor wheels within the same "family" of wheels.Allwheels in the same famialy will share the same outside or majoir diameter,same bore diameter,number of blades and blade aerodynamics and shape.The differnces,between the wheel in the same family,are generally with the minor diameters,or in somecases,the height of the blades.Although a change in tip height may be reason enough for the manufactor to classify the compressor wheel in a differnt family altogether.Many times you will here the term "trim".The trim of a compressor wheel refers to the relationship between the areas of the major and minor diameters of the wheel.A 50-trim wheel will have an area at the minor dimeter that is ane-half or 50-percent of the area of the area at the major dimeter of the wheels.A 40-trim wheel would have a smaller minor diameter that provides an area that is only 40-percent of the area at the major diameter.If you know the major and minor diameter of a particular wheel,you can determine the trim by using the following formula:
trim=[Minor Diameter]^2 /
[Major Diameter]^2]x100
let's say we have a wheel with a 3-inch major diameter and a 2-inch minor diameter.We would just need to take the squre of the minor diameter[2x2=4]anddivide it by the squre of the major diameter[3x3=9].the result of divided by 9 would be .444. Multiplying this by 100,would end up a trip of 44.4 this would be rounded up to a 45-trim compressor trim.The trim is not the ratio of the diameters of the major and minor measurements.it's the ratio of the area and that's why the equation uses the squre of the diameters.
Thread Starter
Joined: Jan 2004
Posts: 39
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From: Baltimore, MD, U.S.
Re: Anatomy of a Turbo (johncarlos)
The Turbine Wheel
Just about everything applies to a compressor wheel also applies to the turbime wheel.Afew areas that are differnt are the fact that the turbine wheel also has a set shaft diameter.Additionally,some turbine wheels are avaiable in a variety of materials that may include ceramics and exotic metals.
The Compressor Housing
The Compressor housing is the home of the crompressor wheel.Avariety of compressor housings may be available for a given compressor wheel.The differnt compressor housings may have differnt inlte diameters,outlet diameters or A/R ratios.The A/R ratio of a compressor refers to how the inner dimentions of the housing are counterd to diffuse the air coming from the compressor wheel.
Just about everything applies to a compressor wheel also applies to the turbime wheel.Afew areas that are differnt are the fact that the turbine wheel also has a set shaft diameter.Additionally,some turbine wheels are avaiable in a variety of materials that may include ceramics and exotic metals.
The Compressor Housing
The Compressor housing is the home of the crompressor wheel.Avariety of compressor housings may be available for a given compressor wheel.The differnt compressor housings may have differnt inlte diameters,outlet diameters or A/R ratios.The A/R ratio of a compressor refers to how the inner dimentions of the housing are counterd to diffuse the air coming from the compressor wheel.
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