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Location:
Carlingford, Sydney
Registered:
May 2002
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Knife Edging and butchering a crankshaft
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Mon, 31 May 2004 06:30
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would anyone recommend doing this on a street engine?
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Location:
Lost in the K hole
Registered:
May 2002
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Re: Knife Edging and butchering a crankshaft
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Mon, 31 May 2004 06:58
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no, not really 
knife edging is a little controversial at the best of times. some swear by it, others dont, the basic physics doesnt add up (which is pointier - the leading or trailing edge of an aeroplane wing?)...
crankshaft lightening is worthwhile if youre realy eager to lose some rotating weight... but i know for one that phil ryles really doesnt like to touch 6cyl cranks.
crank scrapers & windage trays are simpler and cheaper ways of achieving the same goal imho
ed
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Location:
Carlingford, Sydney
Registered:
May 2002
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Re: Knife Edging and butchering a crankshaft
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Mon, 31 May 2004 07:10
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haha yeah i thought i get that answer 
ive been doing a heap of reading up on the net about it and i get the same answer
some love it some hate it
i think for me is wont be worth the effort...
hey ed u know any good site with head porting tips?
ive looked at yours already but an keen for more details
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Registered:
August 2002
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Location:
Lost in the K hole
Registered:
May 2002
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Location:
Carlingford, Sydney
Registered:
May 2002
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Re: Knife Edging and butchering a crankshaft
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Mon, 31 May 2004 07:47
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thanks!!
ive basicly spent the last few days searching the net for info on a whole heap of stuff, trying to find info on extractor and exhaust design as well
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Location:
Lost in the K hole
Registered:
May 2002
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Location:
Carlingford, Sydney
Registered:
May 2002
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Location:
Brisbane
Registered:
October 2002
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Re: Knife Edging and butchering a crankshaft
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Mon, 31 May 2004 10:25
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what does knife edging a crank do again, i forgot 
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I supported Toymods
Location:
I renounced punctuation
Registered:
May 2002
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Re: Knife Edging and butchering a crankshaft
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Mon, 31 May 2004 10:29
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1) Lightens crank.
2) Makes crank more "aerodynamic" so that it cuts through the heavy oil mist in the crankcase more effectively.
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Location:
Lost in the K hole
Registered:
May 2002
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Re: Knife Edging and butchering a crankshaft
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Mon, 31 May 2004 10:29
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its grinding of the leading edge of the crank arms to a 'knife edge' - its supposed to 'cut' its way through the oil fog of the crankcase, lowering friction of the rotating assembly.
its controversial, and has its fans in the v8 pushrod fraternity
as you might be aware though, 'sharp' objects do NOT have the best aerodynamic profile at all, rather, they should be tear shaped. noone has ever done any real work looking at this though.
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Location:
Lost in the K hole
Registered:
May 2002
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Re: Knife Edging and butchering a crankshaft
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Mon, 31 May 2004 10:29
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bugger
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Location:
Yowie Bay, Sydney
Registered:
June 2002
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Re: Knife Edging and butchering a crankshaft
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Mon, 31 May 2004 20:43
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ay, there's nothin wrong with pushrods 
but my chev crank could definately do with some work
the balance weights are allmost 2 inch thick
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