Weight makes a neglible difference to top speed. Whether or not 50bhp is enough for a car to reach 100mph depends on how aerodyanmic the car is. W e s l a k e 1330 In a message dated 18/10/2008 18:37:41 GMT Daylight Time, andrewpayne at intrex.net writes: A 1500 pound car from the sixties cannot go 100 MPH with only 50 HP!" Drew