Turbo Terminology


17-7PH is a precipitation-hardening stainless steel that provides high strength and hardness, excellent fatigue properties, good corrosion resistance and minimum distortion on heat treatment.This special alloy also provides benefits for applications requiring high strength and good corrosion resistance, as well as excellent properties for flat springs

Resists "relaxing" up to 483C. 

Wastegate Springs 


304L stainless steel is a variant of 18 percent chromium - 8 percent nickel austenitic alloy, the most familiar and most frequently used alloy in the stainless steel family. These alloys may be considered for a wide variety of applications where one or more of the following properties are important: resistance to corrosion, prevention of product contamination, resistance to oxidation, ease of fabrication, excellent formability, beauty of appearance, ease of cleaning, high strength with low weight, good strength and toughness at cryogenic temperatures, ready availability of a wide range of product forms.

304L Stainless Steel Flanges & Clamps


Types 347 is stabilized stainless steel which offers as its main advantage an excellent resistance to intergranular corrosion following exposure to temperatures in the chromium carbide precipitation range from 427°C to 816°C. Type 347 is stabilized by the addition of columbium and tantalum.

Maximum use temperatures of 816°C / Melting point between 1398-1446°C






The destructive distillation of engine oil, caused by high temperature in the absence of air which leaves coke and other chemicals having a greater percentage of carbon than the original material.

Can occur anywhere in an engine where oil is present however it is more prone to occur in the turbocharger and connecting oil pipes due to the close proximity of high exhaust temperatures. Coke is abrasive and can cause partial or complete blockage.


C.H.R.A. aka CHRA aka Core; "Center Housing Rotating Assembly"

With most turbochargers, remove the compressor cover, remove the turbine housing and you are left with the CHRA. The CHRA contains the front compressor wheel, rear turbine wheel and shaft, bearing housing and all the internal components.

Unless the compressor cover or turbine housing have been damaged from one of the wheels or excessive heat they are normally re-useable which can be considerably cheaper than purchasing a complete turbocharger.

Example: C.H.R.A. 

COMPRESSOR COVER; aka Comp Cover, aka CC;

Conical shaped housing, manufactured from an aluminum alloy, in which the compressor wheel is located and sealed by a backing plate, the later components being a part of the CHRA.

Atmospheric, filtered air is sourced via the front inlet through the air cleaner assembly, is compressed by the rotating compressor wheel then exits from the side outlet to the intake manifold.

Compressor Cover


Inconel (tm) is a specialty alloy that uses higher percentages of Nickel and Chrome than Stainless steel, as well as many other elements in small quantities. It is actually a trademark name of Inco Alloys International and is in a group of metals known as the Nickel based super alloys. These small additions of other elements is solid-solution hardening. It is quite expensive and therefore usually reserved for applications when some type of stainless steel won't suffice.

Melting point between 1355-1415°C



Very high temperature resistant based alloy comprising of Nickel, Chromium & Iron

Wastegate Valve


A very expensive cast iron alloy which has a very high nickel content being resistant to extreme temperature & corrosion.




Nitronic 60 stainless steel provides excellent high-temperature oxidation resistance and low-temperature impact resistance. Outstanding wear and galling resistance at both ambient and elevated temperatures makes Nitronic 60 stainless steel a valuable material for valve stems & seats.

Valve Seat 


The tough, woven structure of Nomex is extremely strong, has high heat resistance, is flame retardant (it doesn't melt or drip) and doesn't react with water.


TURBINE HOUSING; aka Exhaust Housing;

Snail shaped cast housing, manufactured from ni-resist which contains a high nickel content to withstand extreme exhaust temperatures, in which the turbine wheel is located and sealed by a heat-shield, the later components being a part of the CHRA.

Hot exhaust gases exiting the engine exhaust manifold enter the turbine housing via the base or flange, are super-heated and the resulting exiting of these gases via the rear of the turbine housing into the exhaust system causes the turbine wheel to rotate which in turn rotates the front compressor wheel.

 Turbine Housing

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