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ebay brake rotors--forging...
I wouldn't worry about it too much - I wouldn't be surprised if Morgan
did many completely illogical things in their manufacturing process.
They still build their chassis out of wood, or at least they did the
last time I looked.
They built 3 wheelers...
I rest my case.
Aaron in London
On 12 Mar 2004, at 00:11, David Utley wrote:
> 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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>> 405-470-3129
>> 1-800-522-6793
>>
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>
>
>
> David Utley
> -----------
> Cable Volkswagen
> 405-470-3129
> 1-800-522-6793
>
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