Quicktime_GT

What exactly is the difference if any of the 05+'s pistons, rods, crank, vs a 96-04?

I read in mm&ff that the internals are about the same...

The rumor around here is that 400-450 rwhp on a stock engine is about the limit... You read of 05+s running close to 500rwhp and more all the time. If there is no difference maybe our engines can handle a little more than we think.. either this or 05+ owners are going to see alot of broken rods before long..

any thoughts?

Adam03GT

Thats exactly what i was wondering Quicktime....

A guy that lives in my neighborhood has an 06 at 511rwhp and is on the stock internals..

SINISTER

I would imagine that the guys running that much power on the stock internals are on borrowed time. They may be just getting lucky . . . for now.

Quicktime_GT

well, I can't really find alot of information about the newer engines. I did find this though...



[align=center][/align] In this comparison of an '05 three-valve piston (left) and the previous two-valve piston, you can see the top ring land has moved up, which makes it more prone to breakage under detonation.[/align] Weak Won't Survive
Anyone modifying an '05 GT for more performance should be aware of the engine's limits. After all, it's not Ford's responsibility to provide an engine for racing, so consequently, the three-valve 4.6 was designed for 300 hp, plus a stress safety margin. Steeda says the engine will live with 425 hp as long as timing and fuel is managed to prevent detonation. Anything more than 425 hp and "You're just waiting to buy a new engine," says Dario Orlando. The weak links are the piston ring lands and powdered rods. For emissions, the '05 has new pistons with ring lands very close to the top of the piston. "One of the ways to control emissions is to reduce the unscavenged area around the piston," Orlando explains. "If you move the ring land up as high as possible, you have less unburnt fuel. So Ford moved the ring land up as high as they could while maintaining minimum strength. But the whole purpose of it is alien to performance because they break easily." The powdered rods--which have been used in all modular engines except the supercharged four-valve 4.6 in '03-'04 Cobras--also have their limit. "A powdered rod is simply powdered metal compressed at extremely high pressures where it literally bonds together to make a rod," Orlando says. "And on top of that, the rod cap itself is broken off. So you take off one of the caps and it's literally jagged-edged. It's inexpensive to produce, yet it provides more than adequate strength for a stock engine. But under a performance scenario, you're really stress limited."

lizzyfan

Yep!
I in fact know someone with an '05 that had a Vortech and did a pulley swap running 12 PSI and 500+ RWHP and BOOM!

Adam03GT

So that is saying that around 300hp is the safe point for them? Thats rediculous....

lizzyfan

Not really, it's about the same with 96-04, 300 and no real worries, above it and it's pushing the limit! Besides no guarantees with this stuff when you start adding power!

Quicktime_GT

[quote]ORIGINAL: lizzyfan

Its saying that they make 300 stock