Ever wondered why BMW once built a Formula One engine from a street car block? In the 1980s, BMW took the iron block from a humble roadgoing four cylinder, bored it out, added a turbo, and pushed it to over 1,400 horsepower. That was the M1213 engine used by Nelson Piquet to win the 1983 F1 championship. Mechanics joke that they preferred worn out blocks, claiming the stress cracks made them stronger. BMW didn't start from a clean sheet. They started from a daily driver's engine and still made o