Off the top of my head that looks reasonable Todd, and it clearly shows that with current legal lift specs the Ford has more combined into/exh airflow potential than the GM and.the Mopar.
Throttle blade area is same/same on GM and Mopar and no surprise since they share the exact same 109mm round bore throttle body.
Ford has an oval-shaped throttle bore & I'd bet it has about 25% more area than the COPO & DP.
In 1997, the high volume production Ford 4v valvetrain was capable of running continuously at 8,000 RPM.....My bet is they got better over the past 20 years.
Not sure how the efficiency maps look for Whipple blowers.....when I asked I was told their data was on a laptop that was in a vehicle that was stolen & never recovered. Unless the 4.0L is horribly inefficient compared to the 2.9L, it has about 38% more capacity....makes sense since 4.0L with 25%-ish slower drive speed matches power output of 2.9L on same/same engine.
Just thoughts........
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Originally Posted by JMan;549615[FONT=Georgia
Interesting exercise Rob.
If I calculated right.
Chevy with .641 lift = 4.349 sq.in Int / 3.185 Ex
Mopar with .591/.589 lift = 3.891 sq.in Int / 3.008 Ex
Ford 5.4 with .473 lift = 4.255 sq.in Int / 3.682 Ex
The 4 smaller valves of the Ford increases the curtain area at a lower lift vs. a 2 valve with greater lift.[/FONT]
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