In 1994 Indycar powerhouse Penske exploited a loophole in the engine regulations to dominate the Indianapolis 500. How did they do it? Our technical expert Jake BoxallLegge explains the story of how the engine that would be dubbed the MercedesBenz 500I was created a project so secret that many of Penske's employees had no idea it was being developed until it was almost time to take it to the Speedway