audi moving away from v8 to turbo v6, now
 

and halleluhah! drop the increasing weight and bulked up components, get back to light weight performance sedans. mega HP wars be damned!

Funny.... the 4.2 is the about the same weight at the outgoing 2.7TT
 

How does going back to a 3.0 TT save weight?

...well.......
 

2.7tt (US version) was cast iron block, kinda like a boat anchor under the hood. ;o)

2.7TT was cast iron. They can save 20-30 pounds easily with an alloy block.
 

I would actually prefer to see a CGI block, some weight reduction without sacrificing strength. That won't happen though.

i never understood why it had a cast iron block over alloy to begin with.

Cast iron is very tough and more thermally stable too. It's why many diesels use cast iron blocks.
 

Although some modern alloys have now been replacing cast iron in the diesel world.

It's also one of the reasons you can boost the hell out of the stock motor

Stronger, less bore distortion, and easier to produce a better hone finish. The weight penalty is
 

small when you're talking about an engine as small as the 2.7TT.

To give you perspective, the 380 horsepower iron block B5 RS4 2.7 biturbo weighs 200 kg.

BMW's significantly weaker (alloy block, open deck, cast internals) 335i engine produces 300 horsepower and weighs 187 kg.

The gains aren't much and you give up a lot in strength.

we've had this discussion before and you still don't seem to get it...
 

why are you comparing new V6 designs with the old 2.7TT with cast iron block, among other things?

newer aluminum V6 engines with lighter weight cranks, rods, pistons, intake and exhaust is what i am talking about for the future, which DOES indeed include turbo V6's once again.

many auto mfgrs are making a move back in that direction, primarily due to rising oil and difficulty in meeting CAFE requirements.

the turbo and components add weight, sure. but so do larger and larger V8's or V10's, no?

yawn
 

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