And why do people like billet steel haha!
notices quite an increase in price
just looking for a good fast road cam
Thanks
What Metal Are Mini Camshafts Made Out Of?
Started by
littlemissmagic
, Sep 12 2012 07:17 PM
7 replies to this topic
#1
littlemissmagic
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Posted 12 September 2012 - 07:17 PM
#2
jaydee
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Posted 12 September 2012 - 07:25 PM
Chocolate.
Thats what they use at Piper cams.
Thats what they use at Piper cams.
#3
jaydee
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Posted 12 September 2012 - 07:26 PM
And you dont need a billet cam, just get a regrided one with proper hardening (ie kent cams)
#4
bmcecosse
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Posted 12 September 2012 - 07:28 PM
The tins that John West reject......
#5
Cooperman
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Posted 12 September 2012 - 08:28 PM
The tins that John West reject......
#6
Klevdo2202
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Posted 12 September 2012 - 08:30 PM
The tins that John West reject......
Thought there was something fishy about the quality...
#7
Cooperman
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Posted 12 September 2012 - 09:16 PM
It seems as though original cams suitable for re-grinding are getting rare, so some of the cam companies make them from scratch using a 'billet' of steel of whatever specification they decide is right, then case-harden them.
The word 'billet' in this context just means a 'chunk' of steel with the grain going along its length. Maybe the cam manufacturers think 'billet' sounds better than saying 'high-quality steel bar'.
Where some after-market cams have failed has been the poor case-hardening. I had an after-marlet 649 a while back and the lobes largely disappeared after a while due to poor hardening.
The word 'billet' in this context just means a 'chunk' of steel with the grain going along its length. Maybe the cam manufacturers think 'billet' sounds better than saying 'high-quality steel bar'.
Where some after-market cams have failed has been the poor case-hardening. I had an after-marlet 649 a while back and the lobes largely disappeared after a while due to poor hardening.
#8
sledgehammer
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Posted 12 September 2012 - 10:22 PM
When I worked at Kent Cams ( 80's) - we used to Parkerise the cam lobes ... http://en.wikipedia....iki/Parkerizing
the cam is acid dipped , to retain the oil - they were not induction hardened at the time (1982-4)
bearings were polished some times on the a series , and also the rough cast was machined off to produce a 'steel cam' - a billet as some would say in the 80's
also I used to machine off the pump lobe for racing cam's
as a cam is re-ground , the lobe gets smaller , so the surface area is subject to greater loads , and more wear - you can harden them - but they will still wear faster
when inspecting a cam - larger lobes are better
A CNC bar Profiler can produce a 'blank' quickly - I suspect the blanks come from china - and can be finished by anyone
and are surface hardened after profiling - usually
don't see why they are more expensive ? - maybe a bit more more grinding - but more abundant
the cam is acid dipped , to retain the oil - they were not induction hardened at the time (1982-4)
bearings were polished some times on the a series , and also the rough cast was machined off to produce a 'steel cam' - a billet as some would say in the 80's
also I used to machine off the pump lobe for racing cam's
as a cam is re-ground , the lobe gets smaller , so the surface area is subject to greater loads , and more wear - you can harden them - but they will still wear faster
when inspecting a cam - larger lobes are better
A CNC bar Profiler can produce a 'blank' quickly - I suspect the blanks come from china - and can be finished by anyone
and are surface hardened after profiling - usually
don't see why they are more expensive ? - maybe a bit more more grinding - but more abundant
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