Low-friction tribotape liner improves reliability in long-distance races

Mulberry has over 30 years of experience in conversion work for motor racing. The steel chassis of the four-seater Plus 4 has been completely rebuilt and put on its wheels from scratch using very strong state-of-the-art materials from the aerospace industry. During races, the rear springs and front suspension are usually heavily lubricated and oiled. On very dusty, sandy and dirty tracks, such as at a long-distance rally, these components can fail prematurely as dirt and sand adhere to the lubricated parts. A defect in the rear leaf spring left the vehicle stranded in the Gobi Desert for four days in the last race.

"When I received a sample of the iglidur tribotape with self-adhesive underside, it was a logical step for me to use it on the rear leaf springs," explains Simon Hall, CEO of Mulberry Fabrications. Previously, PTFE tapes had been applied between the leaf springs to replace the lubrication. Under constant load, however, these tended to be pressed out. The tribotape consists of the material iglidur A160, which is characterised by its low coefficient of friction, high wear resistance and self-lubricating specifications. The material is lightweight, easy to machine and also reduces the noise generated by the leaf springs as the plastic absorbs shocks.

Mulberry procured a brand-new set of Morgan leaf springs and dismantled them. The individual leaves were carefully deburred and polished on the sliding surfaces. The tribotape was then cut to size and attached to each leaf. Finally, the elements were reassembled. "The first tests showed a significant reduction in the coefficient of friction thanks to the tribotape. This should also contribute to a more comfortable ride and prevent the risk of mechanical failure and premature wear due to contamination," says Hall.