Why Formula 1 Bans Beryllium And Other Exotic Metals From Racing Engines

Formula 1 banned beryllium and beryllium-aluminum alloys from racing engines in 1999, a regulatory change that significantly impacted McLaren's performance. The material had been used primarily in pistons and cylinder liners, allowing Mercedes — McLaren's engine supplier since 1995 — to run longer piston strokes and match Ferrari's RPM despite producing less power, due to beryllium's unique combination of low weight, high stiffness, and superior elastic properties. Ferrari's then-technical director Ross Brawn had noticed the unexplained performance discrepancy before the ban was introduced.