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 Post subject: Crank
PostPosted: Mon Dec 11, 2017 6:47 pm 
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998cc
998cc

Joined: Wed Jul 02, 2014 11:38 am
Posts: 508
My stroker wedged crank done by reputable people seems to have a slight casting defect on a main journal It is a low spot and not proud I think Spero would have ground it if it was an issue It is all standard size and been sitting around for years and done minimal work. Any ideas gurus.Probably all good If it isnt proud I dont see how it can hurt a bearing shell.Will prolly fill with oil


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 Post subject: Re: Crank
PostPosted: Tue Dec 12, 2017 3:26 am 
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848cc
848cc

Joined: Tue Jan 24, 2017 7:10 am
Posts: 126
Depends on what the defect is, if it's just a small gouge and below the journal height with smoothed off edges it will probably be OK but not ideal. Got a picture to share?


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 Post subject: Re: Crank
PostPosted: Tue Dec 12, 2017 7:45 am 
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998cc
998cc

Joined: Wed Jul 02, 2014 11:38 am
Posts: 508
Will post when it comes back .Its away getting balanced with flywheel cluch and balancer.
One small manufacture defect


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 Post subject: Re: Crank
PostPosted: Wed Dec 13, 2017 8:46 am 
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1275cc
1275cc
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Joined: Thu Aug 31, 2006 7:56 pm
Posts: 2651
Location: Muswellbrook -- NSW
I would of probably spoke to the crank grinder about it .


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 Post subject: Re: Crank
PostPosted: Wed Dec 13, 2017 6:08 pm 
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998cc
998cc

Joined: Wed Jul 02, 2014 11:38 am
Posts: 508
It went there for offset grind after GR wedged then balanced It looks like a work of art . I think it will be OK
is a very old 1100S crank Pic soon.


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 Post subject: Re: Crank
PostPosted: Thu Dec 14, 2017 12:43 pm 
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1098cc
1098cc

Joined: Tue Aug 24, 2004 3:57 pm
Posts: 1478
Location: queensland
Ian_B wrote:
It went there for offset grind after GR wedged then balanced It looks like a work of art . I think it will be OK
is a very old 1100S crank Pic soon.


I would want to see a pic before commenting, but as a rule of thumb, I would not be
inclined to use a crank with a defect, a broken crank gets very expensive. If what you see is small, how much cant you see. If this was offset ground it should have been picked up at that stage before spending any more money on it. Put up some pics when its back you may find you get more accurate advice.

G.

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 Post subject: Re: Crank
PostPosted: Thu Dec 14, 2017 3:00 pm 
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998cc
998cc

Joined: Wed Jul 02, 2014 11:38 am
Posts: 508
No its on a main and they are still STD


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 Post subject: Re: Crank
PostPosted: Thu Dec 14, 2017 5:12 pm 
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998cc
998cc

Joined: Fri Aug 30, 2013 8:59 pm
Posts: 1029
Location: Western Sydney
Depending on how deep the defect is, it could be ground to a STD undersize and be totally removed.

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 Post subject: Re: Crank
PostPosted: Thu Dec 14, 2017 7:11 pm 
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998cc
998cc

Joined: Wed Jul 02, 2014 11:38 am
Posts: 508
Yes mate as long as they keep the fillet radius good All speros work is awesome.


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 Post subject: Re: Crank
PostPosted: Thu Dec 14, 2017 8:11 pm 
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religious status
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Joined: Fri Mar 19, 2004 6:19 pm
Posts: 39621
Location: near Baulkham Hills, NSW
Spiro ground a rusted std/std crank for me this year, the mains only just cleaned up at -.020" due to pitting on the front journal. There is a very slight pit mark that can be seen not felt, Spiro says it will be fine. Not worth wasting another .010" of crank life just to eliminate it.
He does do a great fillet radius, knows his stuff.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:


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 Post subject: Re: Crank
PostPosted: Fri Dec 15, 2017 6:46 am 
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Oh dear, worry, worry...

Joined: Fri Jun 19, 2009 5:31 pm
Posts: 686
Location: North Rocks
Hi Ian
I think you might find that the mark on your crank is where Spiro straightened the crank,if it looks like some one has hit it on the edge of the radius with a blunt chisel that's what it will be.
This is the way we all straighten cranks and cams, you do not put them under a press as this is the way to brake them,
it will not be a problem.
Graham Russell

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 Post subject: Re: Crank
PostPosted: Fri Dec 15, 2017 7:21 am 
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998cc
998cc

Joined: Wed Jul 02, 2014 11:38 am
Posts: 508
Thanks Graham Ill post a pic .Have a great Christmas all My holiday starts today :)


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