Brooke Race Exhaust Technical Specifications

Proven Designs

BRE have several proven designs in place on a range of supercar exhaust systems.

The exhaust systems are designed, developed and fabricated in-house in the United Kingdom to deliver a customized service to every customer.  All BRE systems are tailored to the customers unique requirements in order to deliver a completely personal product.

Systems are available in options ranging from design, materials, surface finishes and manufacturing methods.

Exhaust System Materials for Exotic Motor Cars

BRE systems uses high quality 304 stainless steel or Inconel® 625 for the exhaust systems.

304 Stainless Steel

Stainless steel is an alloy metal made from iron with 18% to 20% chromium and is well known for its resistance to corrosion. It’s still very strong and malleable, making it ideal for the use in the manufacture of a wide range of things including exhaust systems. Exhaust systems made with 304 stainless will last much longer than the mild steel equivalents, and are generally a little lighter. There are different grades of the material, but BRE stainless exhausts are made using 304 stainless. After exposure to heat for a long period of time, 304 stainless may develop a golden color.  Most stainless exhaust systems use 409 stainless which is less costly and contains less chromium and may develop surface rust.  And 409 stainless will generally not last as long as 304 stainless. 

Inconel 625

Inconel® 625 is a class of molybdenum-nickel-chrome-based super alloy characterized by high corrosion resistance, oxidation resistance, strength at high temperatures, and creep resistance. Inconel is able to withstand elevated temperatures and extremely corrosive environments. Inconel 625 has a higher tensile strength than 304 stainless and possesses greater strength at higher operating temperatures.  It is more costly and more difficult to work with.  But the higher strength allows thinner wall construction whilst maintaining the high temperature strength which results in a lighter weight exhaust system.  Inconel is the most widely used material for exhaust systems in Formula 1 racing and many exotic car manufacturers.  The thinner wall construction produces a higher pitch sound compared to stainless steel.

Titanium Alloy

When used for exhaust systems, an alloy of titanium, aluminum and vanadium is commonly used.  Titanium alloys are employed to gain a weight savings over stainless steel.  But compared to Inconel, titanium alloys have a lower temperature rating.  They do possess high strength, but not as high as Inconel.  And, similar to Inconel, titanium alloy allows thinner wall construction versus stainless steel.  However, there is little to no weight advantage of titanium alloy over Inconel.  Titanium has a tendency to turn blue after exposure to high temperatures.  Due to thinner wall construction and titanium's elasticity properties, the sound with titanium alloy is unique with a raspy, high pitch.  Higher than with stainless steel, but similar pitch as with Inconel. One characteristic of titanium and titanium alloys is the tendency toward "thermal creep".  This instability can result in degradation after long time usage which can result in structural failure and cracking.  Raw material suppliers have taken measures to reduce this tendency, but as stated, there is no practical advantage using titanium alloy over Iconel.

Material Properties for Exhaust Systems

 

Design by Forza Componenti