AFIN FINNED ALUMINIUM BRAKE DRUMS

Racemettle Afin brake drums are built to the highest standards of quality and design to match or exceed the appearance and performance of the original aluminium brake drums.

Our Afin drum comprises a cast iron insert that is placed at temperature into a high integrity boxless sand casting system and is then encapsulated in an aluminium alloy chosen to give low differential expansion and high elasticity. Design of the drum is optimised to increase aluminium flow avoiding entrapment of air. Material analysis performed before each melt ensures consistency to the manufacturing process maintaining the high level of quality and accuracy to the casting.

Material selection is made from many years of experience in manufacture of similar products giving practical experience to back up our technical specification. The foundry chosen to carry out this high tech casting procedure manufactures in accordance with stringent demands of the Naval Engineering Standard and the relevant parts of the quality standard ISO 9000 including FMEA, PPAP and AQP.

The labour intensive casting process gives very high level of surface contact between the materials even under high temperature operating conditions and promotes maximum heat transfer to the cooling fins significantly reducing brake fade especially in arduous road and competition conditions.

Afin drums employ a unique mechanical locking system designed to ensure that during the repeated expansion and contraction of materials under the most extreme working conditions it is impossible for the liner to move axially or circumferentially.

Continuing the care and quality applied to the casting process, the drums are stainless steel shot blasted giving an excellent surface finish prior to CNC machining to the highest tolerances of concentricity and roundness.

All this attention to detail and quality in design, materials and manufacturing produces a finned aluminium brake drum specification improving on pre-war standards and that far exceeds the currently available mass market pressed drums that are modified to fit classic cars. The circumferential fins give great strength and bulk to the drum that dissipates heat better and avoids the distortion that can occur with radial fin drums.