19-07-2021, 08:53 PM
Several older cars such as Rovers were fitted with freewheel. Before power brakes drivers reported them as very disconcerting to inexperienced as the car seemed to accelerate when back off.
As above engines are theoretically most efficent flat out at mediaum revs. Full throttle enrichment cuts in so generally best at not quite full throttle. In freak economy runs extreme mpg was acheived by nobbling enrichment devices and accelerating hard then coasting with the engine off.
High overrun revs are undesirable with Sevens. The huge net upward inertia load on the crank is not countered by any strongly firing piston.
Curiously old cars with weak idle pop on the overrun??
As above engines are theoretically most efficent flat out at mediaum revs. Full throttle enrichment cuts in so generally best at not quite full throttle. In freak economy runs extreme mpg was acheived by nobbling enrichment devices and accelerating hard then coasting with the engine off.
High overrun revs are undesirable with Sevens. The huge net upward inertia load on the crank is not countered by any strongly firing piston.
Curiously old cars with weak idle pop on the overrun??