Heh...I'm too cheap for Carillo so I went with a ProX Rod & Pin.
Balancing an 80mm 650 crank
- Thread starter bushmechanic
- Start date
Heh...I'm too cheap for Carillo so I went with a ProX Rod & Pin.
Yes, as well as "pork chop" it. The goal is sub 4000g. Its actually going in a KTM RFS
Joined Jun 2007
4K Posts | 1K+
south east WA Australia
nice one Jar
not sure if you noticed Dr_C s thread is still going, just not on the front page, looks like cranks and pins are next
http://husaberg.org/marketplace/11326-billet-cylinder-head.html
not sure if you noticed Dr_C s thread is still going, just not on the front page, looks like cranks and pins are next
http://husaberg.org/marketplace/11326-billet-cylinder-head.html
Joined Jun 2007
4K Posts | 1K+
south east WA Australia
so first impressions of the 0.62 balance factor on the 80mm crank at 100mm bore are very good
the main thing i noticed when i first did 0.75 and no CB was vibration through the footpegs below 3000rpm
then tried 0.58 was better, then 0.55 which was worse
its a different build with lighter parts but this one at 0.62 has very little vibration through the pegs
engine feels very strong and revs up quick with the small loads im giving it, will see what its like after the weekend when i start revving the **** off it.
the main thing i noticed when i first did 0.75 and no CB was vibration through the footpegs below 3000rpm
then tried 0.58 was better, then 0.55 which was worse
its a different build with lighter parts but this one at 0.62 has very little vibration through the pegs
engine feels very strong and revs up quick with the small loads im giving it, will see what its like after the weekend when i start revving the **** off it.
Joined Jun 2007
4K Posts | 1K+
south east WA Australia
Joined Oct 2003
955 Posts | 1K+
Sweden
Good to hear about the positive results, Bushie!
I have just measured my 80mm crank, 145mm Carillio and 104mm JE piston, which are all quite heavier than OEM!
Left hand side web "imbalance": 442,6g
Right hand side web "imbalance": 455,4g
Piston, rings, pin and clips: 440,8g
Conrod: 393g
Crank pin and bearing: 392,4g
If I add the two webs "imbalances" and withdraw the crank pin and bearing weight, that would sum up to the total "imbalance" of the crank, right? (442,6+455,4-392,4=505,6). The reciprocating mass would be rod and piston together (440,8+393=833,8 ). Then the BF would be "crank imbalance"/"reciprocating mass" (505,6/833,8=0,606). Does this make any sense, or do I really need to cut down on my Pilzsaft consumtion?
I have just measured my 80mm crank, 145mm Carillio and 104mm JE piston, which are all quite heavier than OEM!
Left hand side web "imbalance": 442,6g
Right hand side web "imbalance": 455,4g
Piston, rings, pin and clips: 440,8g
Conrod: 393g
Crank pin and bearing: 392,4g
If I add the two webs "imbalances" and withdraw the crank pin and bearing weight, that would sum up to the total "imbalance" of the crank, right? (442,6+455,4-392,4=505,6). The reciprocating mass would be rod and piston together (440,8+393=833,8 ). Then the BF would be "crank imbalance"/"reciprocating mass" (505,6/833,8=0,606). Does this make any sense, or do I really need to cut down on my Pilzsaft consumtion?
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Joined Jun 2007
4K Posts | 1K+
south east WA Australia
it looks good but im not sure mats 
i'll have another look after Ive had a few bottles
my sober gut feeling is that if you add weight to the piston and rod then the balance factor moves toward zero rather than 100%
so more like 0.4 ... something rather than 0.6
i'll have another look after Ive had a few bottles
my sober gut feeling is that if you add weight to the piston and rod then the balance factor moves toward zero rather than 100%
so more like 0.4 ... something rather than 0.6
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Joined Aug 2009
1K Posts | 346+
Charters Towers, Australia
Joined Jun 2007
4K Posts | 1K+
south east WA Australia
soak in Gunwash (MEK) for a week should kill the glue
crank balancing ... the worlds first v twin triumph was homemade
http://www.xs650.org.au/Technical Info/vtwin.html
http://www.xs650.org.au/Technical Info/smoothness.htm
crank balancing ... the worlds first v twin triumph was homemade
http://www.xs650.org.au/Technical Info/vtwin.html
http://www.xs650.org.au/Technical Info/smoothness.htm
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Joined Nov 2012
2K Posts | 821+
Iceland
FWIW someone measured the DRZ balance factor - perhaps inspired by this thread - and found it to be 0.38 stock (and the DRZ has a counterbalancer as stock): DRZ engine balance factor. - DR-Z 400 - ThumperTalk
How does your balanced crank vibrate with different RPMs? I have a CB removed 2005 628 with stock piston, rod and crank. It shakes to the handlebar worst, but I'm going to buy rubber handlebar mounts to help with it. My bike has pretty much mild-medium vibrations under 4000rpm, 5500rpm absolutely smooth, 6500-7500rpm bad vibration (peak power range...) and 7500+ rpm medium vibration. Stock aluminum engine mounts were cracked so I replaced them with steel mounts.
It's a street bike so it doesn't see over 6000rpm that often, but it would be nice to try to get rid of some of the worst shakes with the next engine overhaul.
It's a street bike so it doesn't see over 6000rpm that often, but it would be nice to try to get rid of some of the worst shakes with the next engine overhaul.
Joined Jun 2007
4K Posts | 1K+
south east WA Australia
Smoother than the stock engine with counterbalancer at high rpm
Vibration is worst at idle decreases up to about 3000rpm and is mostly felt through foot pegs
Vibration is worst at idle decreases up to about 3000rpm and is mostly felt through foot pegs
Hello!
Has anyone tried a bigger balance factor than the 0.75? I've now cut the crankshaft so that the balance factor is 0.79 and wondered is this be bad? :unsure:
EDIT: i grinded more, and now my balance factor is 0.73. I wonder if 0.65 it would be good?
Has anyone tried a bigger balance factor than the 0.75? I've now cut the crankshaft so that the balance factor is 0.79 and wondered is this be bad? :unsure:
EDIT: i grinded more, and now my balance factor is 0.73. I wonder if 0.65 it would be good?
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