Re: Follow up to the "counter weight" thread.
It was thought not needed as the crank was static balanced. And being a inline 4 2 up 2 down the piston and rod assembly was weight matched along with big and small ends being within a weight spec it was considered balanced. A heavy flywheel got the car rolling without revving the engine due to its low hp. Ford engineers determined as we know now there were other forces in play that were offset by adding counter weights to the crank. Flywheel was lightened to offset the added crank weight
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