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February 26th, 2014, 06:46 PM   #41
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Re: Balancing an 80mm 650 crank

I find this very interesting and educational. I was wondering the same on pin replacement. Do you have any photos of the removal process?
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February 28th, 2014, 04:02 PM   #42
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Re: Balancing an 80mm 650 crank

Great stuff Bushie

I checked the weight of the stock 628 crank on a set of accurate digital scales comes in at 4.58Kg
second one was 4.59kg.
What is yours weighing now?
Did the balancing act and the bob weight came in exactly the same as yours at 148grms

Got the prox big end pins here now the ktm 450 pin weight is 391 grms but would be about 15mm lighter (around 376grms) once trimmed to the same length the Husabergs pin weighs 348grms.
But would be about 15mm lighter (around 376grms) once trimmed to the same length
the prox pin and bearing is tighter fit than the Husagerg components, maybe to tight. Have not checked
yet to see if the pin is bigger or the rollers.
The prox 450 pin has the oil inlet hole rotated by 135 degrees in relation to the outlet hole so maybe a hole would need to drilled.
The prox cage is 3grms less than the Husabergs.

Cheers spanner
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February 28th, 2014, 08:11 PM   #43
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Re: Balancing an 80mm 650 crank

Interesting stuff Spanner

I used the prox KTM pin with my old original rod in the 700 it worked well, noticed the press fit was tighter and the big end was not too tight.. but it is an old rod had 220hrs on it at that stage, I used the OEM big end bearing

I probably mic-ed the pin .. will have a look

on my fish scales crank rod etc now weighs about 4.1kgs assembled

i have the weights of the individual parts recorded at work will post them up

Kaffey I may have some pics somewhere of removal on the 550 crank.
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February 28th, 2014, 11:29 PM   #44
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Re: Balancing an 80mm 650 crank

Bushie,

That is handy to know that the ktm pin is a bit tighter, would help with flywheel locking.

How did you get on with the oil hole being out of alignment by 135 degrees or did you just line it up and
have the outlet out 135 degrees ? Might not help longevity to have the outlet in a high load area.

Other than the way they are drilled for oiling, why could the big end pins not be tapered at there
ends like wrist pins. Oil could be easily be drill differently.

Cheers spanner
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March 1st, 2014, 07:24 PM   #45
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Re: Balancing an 80mm 650 crank

i figured the oil hole location didn't really matter because the main wear in mine comes from the cage which is trying to get out at all directions

maybe tapering a pin may reduce the degree of crush at the outer surface of the flywheels... or maybe not

if it did then welding would fix the issue
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March 1st, 2014, 09:12 PM   #46
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Re: Balancing an 80mm 650 crank

Some nice steel here for a crank pin, would Only be suitable for plain bearing use as it can only be hardened to 53-55HRC.
Might get some

http://www.ebay.com.au/itm/300368627823 ... 1423.l2649
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March 1st, 2014, 09:33 PM   #47
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Re: Balancing an 80mm 650 crank

nice

is that $ 107 au per pund for shipping?

shipito again
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March 6th, 2014, 06:04 AM   #48
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Re: Balancing an 80mm 650 crank

Bushie, have you considered balancing each crank wheel independently?




some decent balancing refrences Ive found:

http://www.tonyfoale.com/AermacchiEngin ... alance.pdf

http://www.tonyfoale.com/Articles/Engin ... alance.pdf

http://www.caimag.com/wordpress/2011/05 ... w-i-do-it/

and a balance factor calculator:
http://www.tonyfoale.com/software.htm
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March 7th, 2014, 01:52 AM   #49
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Re: Balancing an 80mm 650 crank

Hi Jar

those articles and pics are very good, thanks for posting them up

I really like this pin design



that's a great idea balancing them separately, also looks like they are trying very hard to replicate things

I have no idea if this will be good or not so i didn't want to spend too much time on it

I forgot to shot peen the rod so I'll do it with the needle scaler

cheers
Bushie
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March 21st, 2014, 03:19 AM   #50
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Re: Balancing an 80mm 650 crank

Done it now Bushie
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