From what i understand they're doing the twin turbo and 4 egrs to help meet emissions.. Why couldn't they twin turbo the 7.3 and put some more egrs on it?

Don't get me wrong, this new engine sounds like its going to be a pretty nice motor, but was there a design problem with the 7.3? From what i've read the 7.3 is a better built motor theoretically.


-paul

 

The 7.3 is a way better engine, the problem is that it won't meet EPA regulations. They are still using them in South American trucks, and they're completely flawless.

 

We still get 7.3l's here in Australia in our Superduties.

While you could possibly get a 7.3l to meet emissions with all the other stuff chucked on - it will never perform as well as the 6.4l.
There are a lot of improvements in the 6.4l (and even the 6.0l) over the 7.3l. 4V per cylinder, fuel system, etc. etc.
What the main problem with the 6.0l (and I assume what you are inferring what will be wrong with the 6.4l) is the ancillary stuff, the EGR, the turbo, early on the injectors etc.
For example I can't thing of any people who have had a rod go through the block on a 6.0l. A know quite a few 7.3ls that have had that happen.

The 6.0l is a very strong core design (head studs excepted). I would not expect the 6.4l to be any different.

 

I see. Was the 7.3 a 2v design? I didn't know that 6.0 was a 4v.

So what you're saying is the 6.0 and 6.4 can withstand more abuse than the 7.3 could excluding the egr, turbo, etc. ? I was always under the impression that 7.3 was a lot stronger core than the 6.0.

 

The 6.0l is 4V per cylinder
http://www.powerstrokedieselstuff.co...gine-specs.asp
The 7.3l, 2V
http://www.nav-international.com.br/...rStroke/hs.asp
(click "cylinder head and valves", then "CYLINDER HEAD COMPONENT LOCATION
")

I don't know which is stronger - but there has been some severe abuse done to 6.0l's by users of this site - only one of which required a new block (and that wasn't because of the block failing, it was due to "experimentation").

 

From what I understand, the 6.0 block is quite thin to reduce the weight. The 6.4 is going to be a stroked version of the 6.0 because they can't safely bore it. I'm sure that if they really wanted to, they could retrofit a 4V head design, twin-turbos and common rail injection onto a 7.3, and it would really kick ***... but the good folks in California have decided diesel emissions will have to be cut in half by (don't quote me on this) 2009, and that might be difficult to comply with.

 

Cool. Thanks for the info guys.

 

i'd be willing to bet they were 01 or later motors with pmr's??????

 

They really do handle it well.

I have since determined that it was not the rod that failed, actually. The piston overheated and softened...the piston eventually broke around the wristpin and the rod became loose, so when it comes right down to it, it wasn't the connecting rod that failed at all.

 

I know i've seen pictures of what you did to that poor engine before.. but what exactly were your mods?