any metallurgists here :)

[rapieper@yahoo.com (Ron Pieper)]

There are/were several, but mfgrs have figured out how to get the silicone? to migrate towards the
wall surfaces during the cooling process, providing a wear-resistant surface.  

And, although I'll have to check, I believe the liners would probably be cast iron vs. steel.

Ron

--- Alan Stamper <scirocco-al@insight.rr.com> wrote:
> As for the wear almost every aluminum engine has sometype of steel or steel alloy liners in the
> cylinders for the pistons to move in.  Unless you do that you end up with Vega's.  Any one else
> know of a car with an aluminum block without liners?
> 
> Alan
>   ----- Original Message ----- 
>   From: Dan Smith 
>   To: L F ; Allyn ; Ryan Schuermann ; scirocco-l@scirocco.org 
>   Sent: Sunday, February 23, 2003 6:47 PM
>   Subject: Re: any metallurgists here :)
> 
> 
>   I knew weight was the reason, I just wasn't sure on the expansion thing. I wouldn't put it
> past auto makers to make a lighter, more efficient engine that wore out a lot quicker due to
> expansion and contraction, hence the question. 
> 
>   Dan 
> 
>    L F <rocco16v@netzero.net> wrote: 
> 
>     Aluminum does have a coefficient of expansion greater than the ferrous alloys and cast iron.
>  That characteristic is accounted for when they design for aluminum. Aluminum blocks are
> becoming more popular for one reason; weight.
>     (And vehicle weight is the major player in the quest for greater mileage)
> 
>     Larry
>     sandiego16v
>       ----- Original Message ----- 
>       From: Dan Smith 
>       To: Allyn ; Ryan Schuermann ; scirocco-l@scirocco.org 
>       Sent: Sunday, February 23, 2003 1:43 PM
>       Subject: Re: any metallurgists here :)
> 
> 
>       Speaking of engine metal, why are most engines aluminum now? Doesn't aluminum expand and
> contract a lot under heat/cold? Wouldn't that really stress out parts and stuff? 
> 
>       Dan 
> 
>        Allyn <amalventano@sc.rr.com> wrote: 
> 
>         if it wasnt an alloy, our bottom ends would all be piles of orange dust by
>         now.
>         Al
> 
>         ----- Original Message -----
>         From: "Ryan Schuermann" 
>         To: 
>         Sent: Sunday, February 23, 2003 4:21 PM
>         Subject: any metallurgists here :)
> 
> 
>         > ok our beloved vw bottom end is... cast iron? Does anyone know
>         > if it's pure iron or an alloy of some type?
>         >
>         > Ryan
>         >
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