When it comes to gaskets used for turbochargers, there is a variety of types available. The question is, which one is the best?
Some of the most popular gaskets include types such as; Graphite coated aluminum core laminate, stainless steel, multi-layer stainless steel and copper.
Gaskets are used in order to seal a surface which isn’t truly flat, which without a proper seal would result in a leak. This results in a pressure loss in the exhaust manifold, reducing turbine drive which in turn causes a drop in performance as well as the annoying sound of a blown exhaust gasket.
Before we choose a gasket, we have to have a look at their working environment. A manifold and turbocharger combo produces a lot of heat, especially at the turbine inlet. These reach normal operating temperatures of 500*C with temperatures reaching up to 1050*C. The gasket will also heat cycle a lot, so heat and corrosion resistance is a key component we require for long term reliability.
Graphite Coated Aluminium Core Laminate Gaskets
As the name suggests, these gaskets are made out of a laminate with an aluminium core and are coated in graphite.
- Max working temperature of 250*C
- Provides a good seal due to gasket thickness
- Price range : £
Stainless Steel Gaskets
Typically made out of 304 stainless steel, these gaskets are pressed into shape from a thin sheet of stainless steel.
- Max working temperature of 1385*C
- Provides a good seal but requires a decent surface
- Sometimes reusable
- Price range: £
- Max working temperature of 1385*C
- Provides a good seal due to gasket thickness
- Reusable
- Price range: £-££
Copper Gaskets
Copper gaskets are cut from a fairly thick, solid sheet of copper. Copper being a soft metal makes it ideal for being squished and filling imperfections like a gasket would. However, these are usually uncommon due to copper being expensive.
- Max working temperature of 1085*C
- Provides a good seal due to soft material
- Reusable
- Price range: ££
Gasket-Less
Although this isn't too common in the aftermarket & modified world, OEM's often use a gasket-less seal. They do this by ensuring the manifold and turbocharger flange surfaces are skimmed perfectly flat. This provides a good seal without the need for a gasket.
- Provides a good seal due to perfectly flat surfaces
- Price range: ££-£££