Re: [AMC-list] Freeze plugs/ Casting plugs

[Joe Fulton <piper_pa20@xxxxxxxxxxx>]

Thanks,

Joe Fulton

--- On Sat, 3/13/10, David Crooks <david.crooks@xxxxxxxxxxxx> wrote:

> From: David Crooks <david.crooks@xxxxxxxxxxxx>
> Subject: [AMC-list] Freeze plugs/ Casting plugs
> To: amc-list@xxxxxxxxxxxx
> Date: Saturday, March 13, 2010, 4:29 PM
> No matter if die cast, or sand cast,
> you still need cooling passages inside
> the block, which means the cast mold has to keep the
> casting material
> out of those area's.  So any casting mold is not only
> shaped like the
> outside of an engine, but also all the internal water
> cooling parts as 
> well.  and of course, the internal parts need to be
> aligned with the external
> shape, so what the "freeze plug" holes really are is the
> supports for the
> internal structure of the mold (ie the water passages).
> 
> The internal bits of the cast will always be
> expendable,   you have to 
> be able to wash them out afterwards.  Die casting,
> where the outside parts
> are heavy steel, allows you to pump the casting material in
> under 
> pressure, instead of letting gravity do the work, but that
> doesn't change
> the need for a removable internal core of sand, or whatever
> material.
> 
> FWIW, an aluminum alloy with 12% silicon is an eutectic
> alloy!  
> One of it's advantages is that it will transition from a
> liquid to a sold
> almost instantaneously, which helps with
> manufacturing.  All those
> Hyper-eutectic pistons you've been reading about, well that
> means 
> they have more than 12% silicon.
> 
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