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Cooper S crankshaft
https://www.ausmini.com/forums/viewtopic.php?f=2&t=32587		 Page 1 of 3
Author:  Panthersteve [ Thu Jun 07, 2007 2:10 pm ]
Post subject:  Cooper S crankshaft
Hi

I saw this crankshaft sell on ebay http://cgi.ebay.com.au/ws/eBayISAPI.dll ... &rd=1&rd=1

What do you all think of this, is it a good price, fair price, high price :?:

Cheers
Steve

Still Learning
Author:  dove grey 64 [ Thu Jun 07, 2007 2:15 pm ]
Post subject: 
i think that price is pretty fair, i've heard from a few sources they normally cost about that much
Author:  Minimic [ Thu Jun 07, 2007 3:58 pm ]
Post subject: 
3 or 4 days ago I saw it at about $519 buy it now. He often relists and ups the amount every day.
Author:  designer [ Thu Jun 07, 2007 4:53 pm ]
Post subject:  cooper s crankshaft
Is the number en40b stamped on the actual crankshaft and if it is can it be viewed on a short motor ?

Are there visible differences between it and another mini crankshaft ?
Author:  simon k [ Thu Jun 07, 2007 6:19 pm ]
Post subject:  Re: cooper s crankshaft
designer wrote:
Is the number en40b stamped on the actual crankshaft and if it is can it be viewed on a short motor ?

Are there visible differences between it and another mini crankshaft ?


it's not stamped, it's cast into it, and yes, you can see it on a short motor

I think that's cheap for an S crank
Author:  Morris 1100 [ Thu Jun 07, 2007 7:29 pm ]
Post subject:  Re: cooper s crankshaft
skssgn wrote:
designer wrote:
Is the number en40b stamped on the actual crankshaft and if it is can it be viewed on a short motor ?

Are there visible differences between it and another mini crankshaft ?


it's not stamped, it's cast into it,
It's not cast. 8)
Author:  drmini in aust [ Thu Jun 07, 2007 7:32 pm ]
Post subject:  Re: cooper s crankshaft
Morris 1100 wrote:
skssgn wrote:
designer wrote:
Is the number en40b stamped on the actual crankshaft and if it is can it be viewed on a short motor ?

Are there visible differences between it and another mini crankshaft ?


it's not stamped, it's cast into it,
It's not cast. 8)

You are right, it's a forged crank. 8) The EN40B is raised letters, from the forging dies. :wink:

I always get a laugh when Poms say they built a Mini donk with "steel crank and rods". What do they think stock ones are, licorice? All A series cranks and rods are forged steel, for those who are wondering. :)
Author:  simon k [ Thu Jun 07, 2007 8:31 pm ]
Post subject:  Re: cooper s crankshaft
Morris 1100 wrote:
skssgn wrote:
designer wrote:
Is the number en40b stamped on the actual crankshaft and if it is can it be viewed on a short motor ?

Are there visible differences between it and another mini crankshaft ?


it's not stamped, it's cast into it,
It's not cast. 8)


OK - can you explain the difference between casting and forging? I really don't know
Author:  graham in aus [ Thu Jun 07, 2007 8:37 pm ]
Post subject: 
Pour molten steel into a mould and cool to 'set' = Cast

Heat steel till soft then bash / squash between big forging tools = forged

Bit simplified, but correct! :P
Author:  Morris 1100 [ Thu Jun 07, 2007 8:40 pm ]
Post subject: 
Forging is heating up a lump of metal and knocking it into shape.
Casting is melting metal and pouring into a mould of the shape.
Author:  drmini in aust [ Thu Jun 07, 2007 8:42 pm ]
Post subject: 
graham in aus wrote:
Pour molten steel into a mould and cool to 'set' = Cast

Heat steel till soft then bash / squash between big forging tools = forged

Bit simplified, but correct! :P

If you have a choice, forged is stronger than cast. The material's grain follows the shape of the part.
For the same reason forged is stronger than billet, if you are talking crankshafts for example. :wink:
Author:  simon k [ Thu Jun 07, 2007 8:48 pm ]
Post subject: 
wow - forging of a crank must be a pretty neat process to watch....

what does 'drop forged' mean on my spanners? sounds like clever marketing
Author:  Morris 1100 [ Thu Jun 07, 2007 9:17 pm ]
Post subject: 
http://science.howstuffworks.com/question376.htm
Author:  drmini in aust [ Thu Jun 07, 2007 9:22 pm ]
Post subject: 
`Drop forged' just means the top die is dropped/driven against the bottom one, drop forging is an impact process.
It doesn't tell you what material it is, could be drop-forged chewing gum if made in China.

The magic words for good spanners are "chrome-vanadium"... :wink:
Author:  Mick [ Thu Jun 07, 2007 9:37 pm ]
Post subject: 
I've got a set of russian spanners here made from "Chrom Vandium" apparently :roll: .

Not all S cranks have EN40B letters necessarily, later ones (68'ish on?)have an AEG480 part number.
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