soft metal ( crank )

seagull Compulsive Aussie Vee Dubber

4,979 posts · joined Dec 2003 · 23 Jan 2004, 8:54 pm

#132547

I have just cut a 1600cc crank in the band saw ,I was very suprised how soft the steel was it cut like butter ,no wonder they snap off so well !

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Craig Torrens 6 times Australian, 7 times State Hillclimb Class Champion

8,040 posts · joined Jan 2003 · 23 Jan 2004, 10:17 pm

#132566

was it a german crank or one of the later cast brazilian ?

seagull Compulsive Aussie Vee Dubber

4,979 posts · joined Dec 2003 · 24 Jan 2004, 1:00 am

#132591

The od of the crank was tuff ( bearing service ) this had been done by flame torch in the factory, 3mm in was this way after this the steel mach like 4140 grade I was suprised of the quality .

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vw54 Administrator Always Waiting 4 Friday

16,723 posts · joined Aug 2002 · 24 Jan 2004, 6:19 am

#132604

Thats how a crankshaft is suposed to be. there only ever hardened on the bearing journals.

They need a certain amount of flexability and or twist built into them.

Its the grain structure of the metal and its alignment thats the all important factor.

If you were trying to harden the inner structure of a crankshaft , you couldnt quench it quick enough after heating to convert the grain structure. Its just too thick through the center section to do this and if it was hard the crank would fracture easier.

I read it on FACEBOOK so it must be true

http://forums.aussieveedubbers.com/viewtopic.php?tid=91278&page=1#pid848630

http://forums.aussieveedubbers.com/viewtopic.php?tid=63561&page=1#pid624099

http://forums.aussieveedubbers.com/viewtopic.php?tid=4832&page=1#pid452603

http://forums.aussieveedubbers.com/viewtopic.php?tid=60650&page=1#pid574409

56astro Custom Title Time!

1,772 posts · joined Aug 2002 · 24 Jan 2004, 7:52 am

#132610

vw54 wrote:They need a certain amount of flexability and or twist built into them.

:o

Fair dinkum?

VW car, VW engine ...... keepin it "real"
35MPG on 101.3kPa

seagull Compulsive Aussie Vee Dubber

4,979 posts · joined Dec 2003 · 24 Jan 2004, 5:37 pm

#132700

Has some one got a snaped unit they can show and tell !

Looking for that special lady : PM me for coffee & cake

Craig Torrens 6 times Australian, 7 times State Hillclimb Class Champion

8,040 posts · joined Jan 2003 · 24 Jan 2004, 6:03 pm

#132709

maybe if I had a SCAT crank I could show you.😉

seagull Compulsive Aussie Vee Dubber

4,979 posts · joined Dec 2003 · 24 Jan 2004, 11:17 pm

#132838

:beer

Looking for that special lady : PM me for coffee & cake

Craig Torrens 6 times Australian, 7 times State Hillclimb Class Champion

8,040 posts · joined Jan 2003 · 24 Jan 2004, 11:28 pm

#132847

haven't you seen the pictures on the USA web sites. There's some good ones, one crank is in three pieces !

I love seeing carnage !

Can you cut a crank down the middle length ways? make a good paper weight !

seagull Compulsive Aussie Vee Dubber

4,979 posts · joined Dec 2003 · 25 Jan 2004, 1:13 am

#132857

race car 5ltr with a snaped crank $$$$$ and it did 500mtrs from new :alien

In the next few days photo

Looking for that special lady : PM me for coffee & cake