One of the main tools I use are dyno sims. The best
use they have is setting RPM range for componentry
like cams and airflow and porting. I recently ran a
very long sim and the main result tested was STROKE.
It seems that for maximum HP (all-out RPM)
the V6 really likes about what a stock 3.8 has
in terms of stroke. Right around 3.39" stroke...
It also seems that for maximum torque, the
truck crank of 3.74" is darn close to what the
computer liked for torque, 3.80" stroke.
1 result even had a 3.74" stroke making
nearly identical torque, just with different
other aspects changed just a bit.
Seems like Ford knew what they were doing!
Anybody have any ideas as to why they chose these stroke sizes ???
I mean theoretical, mathematical ideas, not just "cuz it works best"
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