| [ Total Views: 363 | Total Replies: 7 | Thread Id: 18138 ] |
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 seagull
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| posted on January 23rd, 2004 at 08:54 PM |
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soft metal ( crank )
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
A.k.a.: Craig Torrens
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| posted on January 23rd, 2004 at 10:17 PM |
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was it a german crank or one of the later cast brazilian ?
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seagull
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| posted on January 24th, 2004 at 01:00 AM |
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what I found
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
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| posted on January 24th, 2004 at 06:19 AM |
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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.
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56astro
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| posted on January 24th, 2004 at 07:52 AM |
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| Quote: | Originally
posted by vw54
They need a certain amount of flexability and or twist built into them.
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:o
Fair dinkum?
VW car, VW engine ...... keepin it "real"
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seagull
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| posted on January 24th, 2004 at 05:37 PM |
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I agree ,I still like cutting things up
Has some one got a snaped unit they can show and tell !
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Craig Torrens
A.k.a.: Craig Torrens
Scirocco Rare
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| posted on January 24th, 2004 at 06:03 PM |
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maybe if I had a SCAT crank I could show you.
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seagull
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 posted on January 24th, 2004 at 11:17 PM |
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now you are dreaming !
:beer
Looking for that special lady : PM me for coffee & cake
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Craig Torrens
A.k.a.: Craig Torrens
Scirocco Rare
6 times Australian, 7 times State Hillclimb Class Champion
Posts: 8040
Threads: 347
Registered: January 10th, 2003
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Location: Sydney
Theme: UltimaBB Pro Blue ( Default )
Mood: Time to go Salt lake racing, and actually achieve a result.
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| posted on January 24th, 2004 at 11:28 PM |
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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 !
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seagull
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| posted on January 25th, 2004 at 01:13 AM |
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I post a photo of my mates V8
race car 5ltr with a snaped crank $$$$$ and it did 500mtrs from new :alien
In the next few days photo
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