4.6 block

[pnyxprs96]

i was wondering how much can the 4.6 2v from 96 to 04 handle hp wise . just the block by its self and how much can a stock full motor handle like the rods and mains ect im sure its been asked sorry

 

[mogs01gt]

The block can handle 1000hp+

 

[S351Saleen77]

I was wondering this same thing also. I have heard stock rods are the weak point.

Looking at a friends 99 S281 that has a Saleen supercharger. I have read where the stock rods are good for about 400rwhp and to stay in the 370rwhp range to be safe. Is this true??

Thanks, Tom

 

[mogs01gt]

with a good tune, the rods are good up to around 425. The tune is the most important part.

 

[02nightmaregt]

+1 the tune needs to be spot on. The blocks can handle a chit load of power, but the internals are another story. They say the rule of thumb is 420-430 with a really good tune.

 

[trinity_gt]

The iron block is a pretty stout piece. Even the cast crank is pretty tough if you keep the revs reasonable. The rods and pistons though... The rods have a very thin cross section and the hypereutectic cast pistons are as brittle as kindling. Detonate once under boost and you're more likely than not to break a ring land.

 

[the98stang]

The iron block is a pretty stout piece. Even the cast crank is pretty tough if you keep the revs reasonable. The rods and pistons though... The rods have a very thin cross section and the hypereutectic cast pistons are as brittle as kindling. Detonate once under boost and you're more likely than not to break a ring land.

Block itself can handle around 1000whp. The rods/pistons/bearings can handle around 400-450whp depending on the tune and blower type. Roots blowers are harder on the engine versus centrifugal. Less timing and more boost is safer. Advanced timing/low boost/high AFR is asking for trouble. Usually you want to tune these 4.6 for 11.0 AFR or less (with boost) to prevent detonation and engine failure.

 

[S351Saleen77]

Block itself can handle around 1000whp. The rods/pistons/bearings can handle around 400-450whp depending on the tune and blower type. Roots blowers are harder on the engine versus centrifugal. Less timing and more boost is safer. Advanced timing/low boost/high AFR is asking for trouble. Usually you want to tune these 4.6 for 11.0 AFR or less (with boost) to prevent detonation and engine failure.

Thank's for the tip on the AFR!

 

[blubullett]

Lots of people have made 450-475 fine also, im at 419hp with 11.6 afr for the last 25k and havent had any problems. And Im not easy on it. There is a thread from a couple weeks ago about how much a stock bottom end can handle. You should search it. It is pretty educational.

 

[the98stang]

Lots of people have made 450-475 fine also, im at 419hp with 11.6 afr for the last 25k and havent had any problems. And Im not easy on it. There is a thread from a couple weeks ago about how much a stock bottom end can handle. You should search it. It is pretty educational.

There are some "freak" blocks out there. Cody (hotmustang) had a TT stang with over 500whp on the stock block for a while (until it was wrecked). I really think with the right timing/AFR/tune these engines can handle 500 +whp.