Obliv

@ very different engines. 3v vs 2v, 2 extra cylinders, etc.

Also, they purposefully kept the v6 at 210hp. Just taking off the muffler adds 10rwhp. They do this not to cannibalize GT sales, along with not adding duals :P

Norm Peterson

The Cliff's Notes version is that the 4.6 breathes that much better. The full, in-detailexplanation would probably fill a book. Everything in the intake tract matters, down to the cross-section area and actual shape of the runners and the various bends taken. Head port design, valve curtain area, mixture swirl and tumble in the cylinder, piston design, cam profiles, every exhaust tract design consideration that you can think of (plus a few) . . .

You should find that torque comparisons between the 4.0 and the 4.6 are more in line with the displacements. IOW, much closer to 15% apart than the HP numbers are.

By itself, stroke is NOT responsible for HP. Only that it's an easy way to add a significant amount of displacement, and it's the extra displacement that makes the extra power. I'd fully expect that if Ford had given the 4.6L a slightly bigger bore and a slightly shorter stroke (and held the displacement at 4.6L) it would be making even more power in OE NA form. But large bore/short stroke engines are typically more difficult to get certified with respect to emissions, so it's extremely doubtful that you'll ever again see anything like the 4.00" bore / 2.87" stroke (101.6 x 72.9 metric dimensions) that was the pushrod 289 displacement specs.

Edit: Anybody whose curiosity has beenawakened by anything in this whole thread might want to chase down any number of books concerning engine design written by David Vizard.


Norm

MexGT

So the end of the story is .... get a V8

danomano

More info on the matter

http://en.wikipedia.org/wiki/Talk:Pushrod

Jsierzega

that would be cool and all but too bad the 6 doesnt loose 56hp from the crank to the wheels. it closer to 175

Grabber

So, just taking the mufflers off of a V6, 2V, gains 10 rwhp? Damn, talk about a torque monster

rad_rob

Hence why my license plates say "V6 HAHA"[8D]

CroDalmatinac

Maybe, just maybe because they are made there and they don't cost as much as the "premium" American counterparts....

Daniel60

V-6s' are pretty Stout.