The Ford Barn - View Single Post - Max Speed of a Model A with 26% OD and HC Head

Synchro909 · 04-21-2021, 08:59 PM

Without getting into the details of the physics, it takes a certain amount of power to push a car along at any given speed. As the speed rises, the resistance increases till you reach a point where the available power is all used to maintain what is the maximum speed of the car. So long as there are no silly gearing issues etc, O/D or not will not make much difference to the top speed. The O/D does not increase the power available. The HC head makes a bigger difference.
That said, if you want to travel at say, 60 mph, the car is happier with the O/D. Things are not so busy under the hood.

04-21-2021, 08:59 PM	#15
Synchro909 Senior Member Join Date: Jun 2014 Location: Melbourne, Australia Posts: 7,564	Re: Max Speed of a Model A with 26% OD and HC Head Without getting into the details of the physics, it takes a certain amount of power to push a car along at any given speed. As the speed rises, the resistance increases till you reach a point where the available power is all used to maintain what is the maximum speed of the car. So long as there are no silly gearing issues etc, O/D or not will not make much difference to the top speed. The O/D does not increase the power available. The HC head makes a bigger difference. That said, if you want to travel at say, 60 mph, the car is happier with the O/D. Things are not so busy under the hood. __________________ I'm part of the only ever generation with an analogue childhood and a digital adulthood.