As a matter of fact, out of pure curiosity, I made a few different calculations and found that the 521, if only allowed to make 680 ft. lbs. at a similar RPM would only then just be on par with the 920 ft. lb. Powerstroke in terms of acceleration.
Gearing is where it's at and torque multiplication THROUGH gearing means that higher average horsepower will win every time (just not from a durability standpoint).
Last edited by cleatus12r; Fri, December 23rd, 2011 at 12:25 PM.
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