Some terms are from waaay back in the old days. Like horsepower for instance. No real horses invloved anymore. (Sept' maybe for the Ford Mustang guys)
 It was just a way to visuallize how much power an internal combustion engine had, compared to the nag in the barn.
   It was just a way to visuallize how much power an internal combustion engine had, compared to the nag in the barn. Here's 1..... Why is vacuum measured in inches and boost measured in lbs.?


 
  



 Oddly enough I get the "70" part.
 Oddly enough I get the "70" part.