[Shad Laws]

Hello-

Sorry but your totally wrong Chad,

(it's Shad... I wasn't blessed with an easy-to-spell name :-).

I wasn't refering to your exact product, but extrusions are always weaker than castings.

Absolutely false. It depends on all the specifics!

Extrusions, at their _finest_, are essentially open-die forgings, and are just as strong, too. 400MPa is a VERY high yield strength for aluminum alloys - go to the reference books and find a semi-common casting alloy that's higher. There aren't any.

Our extrusion is essentially a tube. Rather than just bore out the metal in the middle, we force it to the outside. This results in a stronger piece, and an organized grain structure in the axial direction. Given that the highest single component of stress for 99% of cylinder applications is the axial one caused by compression of the studs (because the aluminum wants to expand), this is a good thing!

And yes, I have done all the Finite Element Analyses on the structure and know that what I just said is true, unless you have 50 bazillion pounds of boost :-).


Thats why we use alot of castings to produce our Aerospace and Medical Components. These could be Whittled out of billet alot easier.

The geometry is likely different, which can yield different results. Also, in decent quantity, casting is a lot cheaper than machining one by one.

Another thing in aerospace and medical stuff is metal matrix composites. Here, casting is even more common because CTE is low as is machinability, making casting even a better bang-for-buck option.


The molecular structure of extrusions can be compared to a slice off of a log, you give it some stress from the side and it fails...

This isn't a 1/32" extruded wire, this is a 6" tube. Big difference.


Cast material has multi-lateral matix, grain structure,

Actually, the grain structure from casting aluminum is mostly random. The only time it takes shape is when dissimilar cross-section thicknesses cool at different rates.


Thats why Porsche used it then and does today.

Not for their prototypes, but for production, it's quite a bit cheaper.

But what do they know compred to you, nothing I guess.

That's not true.

If I were Porsche, I'd use billets in testing (before I dialed in the turbo and computer and whatnot to make sure there was no detonation, etc.), then swap over to casting to save the piles of money there is to be had in even making 100 engines identically (i.e. even their racing engine production runs).


Good Luck to the Gentleman who is inovative an adapts the Porsche Jugs, don't let someone beat you down, so the might line their wallet W/$$$

EXCUSE ME???

With all due respect Joe, leave me the hell alone. You've challenged my character before. You even told me that I crafted the truth around my desire to get money.

I see these actions as very unethical, and respectfully ask that you remove this behavior from here immediately.

Good day.