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Author Topic: Some pic?s of a wasted crank.  (Read 3892 times)

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Offline doordie

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Some pic?s of a wasted crank.
« on: February 07, 2006, 04:53:16 AM »
8000 rpm (70hp) iceroadracing and a long straight with full throttle! :evil:
Little vibrations  :lol:

//doordie
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Offline alan

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Re: Some pic?s of a wasted crank.
« Reply #1 on: February 07, 2006, 04:55:40 AM »
Quote from: doordie
8000 rpm (70hp) iceroadracing and a long straight with full throttle! :evil:
Little vibrations  :lol:

//doordie

GNARLEY
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Offline gowen

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RE: Re: Some pic?s of a wasted crank.
« Reply #2 on: February 07, 2006, 06:04:59 AM »
Wow!!!!!! and.... wow!!!!!!!!!
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Offline hughes

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Some pic?s of a wasted crank.
« Reply #3 on: February 07, 2006, 06:20:04 AM »
Is the flywheel balanced :?: Or can they be balanced :?: Looks to sheared off right in front og the bearing. Is that correct :?: Hope you get it back up and running.
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Offline doordie

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Some pic?s of a wasted crank.
« Reply #4 on: February 07, 2006, 06:30:01 AM »
Mainbearing checked-out, vibration,rpm and forward moving force killed that old -92 crank. :(
No problem with vibration before that straight. :o
Bigger gas/oil-holes and a C2 or C3 SKF (Sweden)mainbering take care off the problem I hope. :wink:

//doordie
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Offline demographic

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Some pic?s of a wasted crank.
« Reply #5 on: February 07, 2006, 06:48:01 AM »
Quote from: doordie
Mainbearing checked-out, vibration,rpm and forward moving force killed that old -92 crank. :(
No problem with vibration before that straight. :o
Bigger gas/oil-holes and a C2 or C3 SKF (Sweden)mainbering take care off the problem I hope. :wink:

//doordie


Isn't the difference between C2 and C3 just the bearing clearance?
Don't you just use the tightest clearance you can get away with?

Mines in bits at the moment and would appreciate your input.
What do you mean about bigger Gas/oil holes? The ones by the crank bearing?

Also I am "sharpening" the castings in the areas shown in your topend rebuild thread, have you any other hints that you could PM me?

Regards Scott.
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Offline hughes

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Some pic?s of a wasted crank.
« Reply #6 on: February 07, 2006, 07:02:53 AM »
Who tures and balances your cranks :?:
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Offline doordie

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Some pic?s of a wasted crank.
« Reply #7 on: February 07, 2006, 06:49:45 PM »
demographig,
You need a bearing who can handle what rpm you use mostly. :wink:
C or C1 is stock and can handle burst up to stock toprev, but generally
not more than and 5000 rpm.
The heat and poor lubrication are a "killer" and you can make the feeding gas/oil holes flow better
and bearings life easier.

Hughes,
A friend of mine true and balance my cranks. 8)
I will changes the balancefactor from now 5000 rpm (MX) which is stock to a another rpm. :wink:

//doordie
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Offline doordie

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Some pic?s of a wasted crank.
« Reply #8 on: February 08, 2006, 06:01:11 AM »
Here is a "hot" crank! :twisted:

//doordie
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Offline demographic

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Some pic?s of a wasted crank.
« Reply #9 on: February 08, 2006, 08:50:56 AM »
Quote from: doordie
demographig,
You need a bearing who can handle what rpm you use mostly. :wink:
C or C1 is stock and can handle burst up to stock toprev, but generally
not more than and 5000 rpm.
The heat and poor lubrication are a "killer" and you can make the feeding gas/oil holes flow better
and bearings life easier.


You said you can make the crank bearing oil feed holes flow better, what does that involve?

Drilling it to a bigger diameter or countersinking the entry point for the oil so it "catches" more oil?
Theres some pics from Zanxs rebuild thread that show the oil feel holes here, how are you planning on changing them?

http://www.allthingsmoto.com/forums/attachment.php?attachmentid=955&d=1058636335
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Offline 5dracing

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Some pic?s of a wasted crank.
« Reply #10 on: February 09, 2006, 12:09:08 AM »
Has anyone considered ceramic bearings? Is there a benefit? I have my sons 85 apart right now and I'm considering this mod.
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Offline doordie

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Some pic?s of a wasted crank.
« Reply #11 on: February 10, 2006, 07:36:52 AM »
demographiq,
Haven?t "take care" of the problem ?cause this sunday is a importent raceday.I?m using my sparebike now. :wink:
 
(wich me luck,a little bit sore after a highsider at training last weekend.Ice is HARD guys!) :oops:

5dracing,
Yeah !!! :twisted:  :twisted:

But have to find a suiteble bearing,IF you guys have some sparetime over,plz help me out?! :wink:
 
("Think" 6306 is the number of mainbearings)

//doordie
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Offline gowen

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Some pic?s of a wasted crank.
« Reply #12 on: February 10, 2006, 07:45:52 AM »
Doordie!!! It looks like you had too many vibes and also the big one!! That flywheel is just too d**n heavy!!!!!!!
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