This article is from the Motorsport FAQ, by A H Henry bspahh@midge.bath.ac.uk with numerous contributions by others.
A racecar is a system and not just an engine bolted to a chassis. The
fairly promising Truesports IndyCar chassis with a down-on-power Judd
turned into an ill-handling pig when fitted with an Ilmor. Another
example: when Tyrrell got decent results in the 1990 F1 season
despite only having Ford DFR power, the 019 seemed to be an excellent
chassis. However, in the following year when they got the Honda V10s
which had given Senna the world championship, the car handled like a
pig. The extra weight and power from the engine had destroyed the
balance of the car.
 
Continue to: