Quote:
Originally Posted by Jim D'Amore
Gump,
The 4.0L is legal for Showdown according to NHRA, they actually approved the 4.0L combination. As long as Ford is willing to put it into the showdown guide. As for a common supercharger I even told Mike D. lets take the 4.0L off and exchange it for a 2.9L. His answer was still no.
Lets get to the facts here...the 4.0L supercharger with the 4.00" pulley on it will spin 6,000 RPM slower at 8,500 engine RPM. The 4.0L supercharger is also a rear entry requiring 2 90* turns before the air hits the impellers. The 4.0L takes 32 more HP to turn it than a 2.9L. It only produces on the 5.4L engine right around 20-21 psi boost. Compared to the 2.9L's that make 26-28 psi. Due to its new Gen 3 rotor design and the front entry feed. Here is the big fact Gentlemen. The 5.4L set to NHRA's max allowed bore, compared to GM and Mopar's max allowed bore we are 30 cubic inches less than COPO and 34 cubic inches less than MOPAR. So even if we had the same amount of boost the with the 4.0L we would still be at a disadvantage with the 5.4L because of cubic inch. We would still be bringing a knife to a gun fight but it's still better than what we currently have in the 08,10, and 12 CJ's.
Jim D'Amore
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But you have multiple cam shafts and 3 valves per cylinder
And you want a bigger piston? This ain’t nascar. All 3 manufacturers do it differently
Sounds like you need to get another combo. Seems like Watson goes fast and is competitive