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ebay brake rotors--forging...
Yeah, you are prolly right (ouch, that hurt)... If anything it is prolly
more akin to strss-relieving, if ANYTHING... I will take that up with him, as
he is much like me, interested in figuring things out to an irritating
degree... :-)
Thank you for the kid gloves... :-)
David Utley (aka knowitsometimes)
Quoting L F <rocco16v@netzero.net>:
> David,
> A forging process is instantaneous. And I've never heard of anyone
> forging cast iron (those forged crankshafts are steel).
> Stress relieving is not the same as forging.
> The maximum temp delta a part would see laying outside for years would be
> about 100F. To you and I, one hundred degrees is a bunch...to cast iron it
> is virturally nothing and would have no effect on grain structure. You and I
> have a working range of about 50 degrees (50deg at the coldest to about
> 100deg at the hottest), cast iron has a working range of about 1500degF.
> As I said, the only metallic material in common use today that will respond
> to just laying around is some aluminum alloys.
>
> Your friend may have misunderstood or the Morgan people were having fun with
> him....which wouldn't be unusual.
>
> Larry
> ----- Original Message -----
> From: David Utley
> To: L F ; Euroroc II
> Cc: Scirocco-l@scirocco.org
> Sent: Wednesday, March 10, 2004 8:33 PM
> Subject: RE: ebay brake rotors--forging...
>
>
> Larry,
> I agree that forging is more effective, and quick, if it is done under
> pressure. However, this is coming from Morgan, so I do not know what to
> say? If they are online, I will send them an email and see if they can
> shed
> some light on it? I trust the friend with my life, so I do not think he
> is
> pulling anything with me.
>
> To carry through on what you just mentioned, I grant you that a used
> engine will work-forge (or stress-relieve as you put it), with the
> thousands
> of heat cycles. Is it not true to a lesser degree with an item that has
> hundreds of heat cycles with the warming of the day, and the cooling of
> the
> night? Especially considering that it is done very slowly, which as I
> understand it is done in some forging practices? If you would, please
> help
> me remember which ones and why slower warming/cooling is
> effective/helpful.
>
> Thanks,
> David Utley
>
> -----Original Message-----
> From: L F [mailto:rocco16v@netzero.net]
> Sent: Wednesday, March 10, 2004 8:19 PM
> To: David Utley; Euroroc II
> Cc: Scirocco-l@scirocco.org
> Subject: Re: ebay brake rotors--forging...
>
> David,
> Somebody gave your friend some bad info.
> Used cast iron blocks are desireable because the heat cycling tends to
> stress relieve them, whereas a 'green' block still has some "moving
> around"
> to do.
> Cast iron parts do nothing just laying around, as opposed to some aluminum
> alloys which DO age over time.
> I take that back; cast iron parts DO go through a change.....they convert
> to
> iron oxide.
>
> Nothing gets 'forged' just watching the weeds grow...it takes heat and
> pressure to forge.
>
> Larry
> ----- Original Message -----
> From: David Utley <mailto:mr.utility@highstream.net>
> To: Euroroc II <mailto:flaatr@yahoo.com>
> Cc: Scirocco-l@scirocco.org <mailto:Scirocco-l@scirocco.org>
> Sent: Tuesday, March 09, 2004 12:15 PM
> Subject: Re: ebay brake rotors--forging...
>
> LOL...
>
> Yeah, I did learn something interesting about this though... A close
> friend
> went where they make Morgans in England years ago. He saw in the back
> that
> they had brake drums and blocks waist-high, piled out in the open... He
> asked
> what was all the waste rubble lying around, and they replied that those
> were
> new rotors and blocks, aging... They said that they let them age a
> minimum
> of
> two years, then bring them in and machine them for use. Why? They
> actually
> forge over time, from the hot-cold of day and night repeated several
> hundred
> times. That, and this is in England, which has to be one of the rustiest
> (is
> that a word?) places in the world... I thought that was very
> interesting...
>
> On a side note, most seasoned engine builders prefer to build a good
> used
> block over a brand new one for this reason. The number of heat cycles
> work
> hardens the block... The one obvious exception to this rule has to be VW
> aircooled blocks. Ultimately, they should not be reused....
>
> Just food for thought....
>
> Regards,
> David Utley
> Quoting Euroroc II < flaatr@yahoo.com <mailto:flaatr@yahoo.com> >:
>
> > Some one needs to buy these... they're like new!!!
> >
> > http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?
> ViewItem&category=33564&item=2465387184
> >
> > -Raffi
> >
> >
> > _______________________________________________
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> >
>
>
>
> David Utley
> -----------
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>
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>
David Utley
-----------
Cable Volkswagen
405-470-3129
1-800-522-6793