y is the 3v able to run 475+ rwhp and tq but not a 2v? it was my understanding that they shared the bottom end. hell even fords whipple kit dyno's 475 at the tires and they have no problems with it.

 

well from my understanding, without knowing the exact specifications of the 3V bottom end, it would be because the top end is so much more efficient.

I think a ported set of 3V heads flows somewhere around 320CFM, a SUPER port job on a 2V is around 240CFM, with stock numbers about 80CFM less.

So I would imagine they can make more power because it's putting less stress on the bottom end when doing so. I still don't know how safe they would be at that level .

 

seems the safe level on s197s is right around 500whp... idk maybe robs theory is right, or maybe they use a different mix of sillicone and other metals.

 

My guess too would be efficiency. Its like a GT vs Mach 1. Same bottom end but at 10 psi the mach one makes much more power than a GT at the same amount of boost due to its greater effiency, and greater compression ratio... but leave this part out for this sake. And i thought the rods were different in the s197...?

 

allso the 03 dont have the weak connecting rods like the 2v and yes there heads flow WAY better than the 2v which plays a huge role in why they make more power
and i believe the whole rotating assembly is forged in the 3 v also

 

everything except the last part is true.

they DO NOT have a forged rotating assembly. if they did, you'd be seeing 900+rwhp 3Vs on the stock block

 

i saw an article on hot rod mag (i think) where they talked about all the improvements ford made to the engine over the previous 2v engine. i remember them showing how the pistons had been improved with a coating on them and the bearing system was improved, ect. more hp through better efficiency

 

280 cfm ported around 220ish stock.... the heads are the difference

pretty sure there is no difference in the rods

 

i guess i'll play devil's advocate

how would more efficient heads allow the bottom end to hold more power? if that was the case, the 4v would be able to make more power than the 2v before something breaks... but we all know they have similar max HP limits

so i'm just saying as far as the 3v is concerned, it's probably more than just the heads

 

The theory that they are using is, with more efficient heads you will lessen the strain on the short block. Instead of dumping 13lbs of boost into the cylinder to make 500hp, you might only need to use 8lbs. Lower cc pressure, lower stress on the rotating assembly.