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Home > General Chat > Anyone got pics of a 'knife edged' crank?

paul wiginton
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As title, curious, not seen it done on A/A+

Paul

I seriously doubt it!


AWDmoke

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Doesn't really suit the A series, and I've not seen it done either.

Wedging is a good idea though.

On 24th Dec, 2008 Nic said:
eyh? im drubj but very confused##]#IU


fastcarl

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leeds/wakefield.

Are you joking,

On 19th Jul, 2009 paul wiginton said:
As title, curious, not seen it done on A/A+

Paul

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paul wiginton
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No, Ive done, wedge, blade, backdrill, but not seen knife edging which is supposedly for aerodynamics. Swifty spoke of it a few times


I seriously doubt it!


fastcarl

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leeds/wakefield.

blading is knifedging as far as i was aware,

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paul wiginton
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On 19th Jul, 2009 fastcarl said:
blading is knifedging as far as i was aware,


No, its on the leading edges for aero. Ive seen it on a crank for something else

Edited by paul wiginton on 19th Jul, 2009.

I seriously doubt it!


fastcarl

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leeds/wakefield.

i thopught that would be what you were refering to,

all my cranks have an almost full radiused edge to the web, none of that rough as a bears arse flat left when its somply milled off and had a very cursory clean up of sharp edges,.

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paul wiginton
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You can see it on this crank on the leading edge of the counterbalance

I seriously doubt it!


fab

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this v8 crank is supposed to turn in a bath of oil, so the knifedging is there to reduce oil/air mix, and oil resistance to rotation.
a mini one doesn't , could be usefull on a midget a serie, but don't think it will help on mini, that said it's a beauty!


paul wiginton
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The text that came with that pic said its for air resistance. Im sure it wouldnt be sitting in the oil

I seriously doubt it!


philc

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i think sprocket may have his done, but i could be wrong.
My understanding of this is that it cuts through the air and oil, so as you say resistance therefore there could be some gains along the way


PaulH

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The only V8 I have ever seen that ran its crank in a bath of oil was and old US diesel motor that ran splash lubrication, and reved to 600rpm

On 17th Feb, 2009 Rob H said:

I find the easiest way is to super glue the bolt to the end of one of my fingers.

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fab

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I think that you could have imagine, that if you're not using dry sump then,
your sump look as a bath in which oil is carried,and canot stand all time in bottom of it( corner, acceleration, braking... racing what!!! isn't a lot of engine are built like this, then the interest of knifedge is to cut the oil/mist instead of hurt it,
canot be more explicit,
as for 'air' cut, think of your pistons going up and down, your knife on the crank will gain about nothing in air, this is the raison why it si generally not used on dry sumped engines.


On 19th Jul, 2009 PaulH said:
The only V8 I have ever seen that ran its crank in a bath of oil was and old US diesel motor that ran splash lubrication, and reved to 600rpm


Vegard

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Blading an A-series crank...NOOO

On 13th Jul, 2012 Ben H said:
Mine gets in the way a bit, but only when it is up. If it is down it does not cause a problem.



paul wiginton
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On 20th Jul, 2009 Vegard said:
Blading an A-series crank...NOOO


Is that just because it loses counterbalance?

I seriously doubt it!


Vegard

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Exactly. Great for drag racing, stupid for longetivity. Horses for courses!

On 13th Jul, 2012 Ben H said:
Mine gets in the way a bit, but only when it is up. If it is down it does not cause a problem.



fastcarl

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leeds/wakefield.

but we're not that interested in longivity.

he who dares wins,


On 20th Jul, 2009 Vegard said:
Exactly. Great for drag racing, stupid for longetivity. Horses for courses!

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paul wiginton
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Exactly Carl

I seriously doubt it!


fastcarl

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leeds/wakefield.

how wbout foam filling the crank,


ive thought about sedctioning the crank into maybe 6 parts, maching out all the innerds then welding it all back together and using high strength polyurathane foam injected back into the voids to replace the missing steel and reintroducing the lost rigidity,

it a winner i tell you,

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Joe C

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Carlos Fandango

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sod welding it, just drill a small hole and get it spark erroded out.

On 28th Aug, 2011 Kean said:
At the risk of being sigged...

Joe, do you have a photo of your tool?



http://www.turbominis.co.uk/forums/index.p...9064&lastpost=1

https://joe1977.imgbb.com/



paul wiginton
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On 20th Jul, 2009 fastcarl said:
how wbout foam filling the crank,


ive thought about sedctioning the crank into maybe 6 parts, maching out all the innerds then welding it all back together and using high strength polyurathane foam injected back into the voids to replace the missing steel and reintroducing the lost rigidity,

it a winner i tell you,


Come on Carl, catch up! I did that years ago

I seriously doubt it!


PaulH

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Ya FFS, sure Paul you have the alloy crank now don't you







Ho shit I Forgot iv let the cat out of the bag sorry Paul

On 17th Feb, 2009 Rob H said:

I find the easiest way is to super glue the bolt to the end of one of my fingers.

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James_H

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Auckland, New Zealand

Ive got some expanding foam in the shed if anyone wants it? i've already done 2 or three like this, quite simple to stick them back together with the Mig.


ministef1

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Cranleigh, surrey

Just chop the counterbalance off like carl does! Thats why he probably doesn't knife it! hahaha!

"Cars are a lifetime of pain"


carl talbot

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from another of your threads
isn't this what your on about ?
http://www.shengineering.co.uk/pcmcrankshafts.aspx

Home > General Chat > Anyone got pics of a 'knife edged' crank?
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