Husaberg
Go Back   Husaberg Forum > Mechanical and Technical > Mechanical

Mechanical Mechanical Forum - spinning bits and gyrating bobs


Thanks Tree34Thanks
Reply
 
LinkBack Thread Tools Display Modes
February 8th, 2014, 04:25 AM   #21
Senior Member
 
plumbbob's Avatar
 
Joined: Aug 2008
From: England, Southampton

Posts: 738
Thanks: 140

I Ride: 02 650 StreetTracker, 92 K100 Special, 92 Triumph Cafe Racer.
Re: Balancing an 80mm 650 crank

Back on the scales, the piston is 270g and the rings 13g.

Here's a few pics of the piston,

[attachment=2:h0u2vnju]piston base.jpg[/attachment:h0u2vnju]

[attachment=1:h0u2vnju]piston side.jpg[/attachment:h0u2vnju]

[attachment=0:h0u2vnju]piston top.jpg[/attachment:h0u2vnju]

And even got the pics to show
Attached Thumbnails
Balancing an 80mm 650 crank-piston-base.jpg   Balancing an 80mm 650 crank-piston-side.jpg   Balancing an 80mm 650 crank-piston-top.jpg  
Thanks from bushmechanic
plumbbob is online now  
 
February 10th, 2014, 10:43 AM   #22
Senior Member
 
Joined: Nov 2001
From: Ely, England

Posts: 15,137
Thanks: 351

I Ride:
Re: Balancing an 80mm 650 crank

I'd have gone for the taller and I guess heavier piston and got the squish right. those 2002s are miles away. look at the dished piston. it needn't weigh a helluva lot more...

regards

Taffy
Taffy is offline  
February 10th, 2014, 11:31 AM   #23
Senior Member
 
plumbbob's Avatar
 
Joined: Aug 2008
From: England, Southampton

Posts: 738
Thanks: 140

I Ride: 02 650 StreetTracker, 92 K100 Special, 92 Triumph Cafe Racer.
Re: Balancing an 80mm 650 crank

Originally Posted by Taffy
I'd have gone for the taller and I guess heavier piston and got the squish right. those 2002s are miles away. look at the dished piston. it needn't weigh a helluva lot more...

regards

Taffy

I'm just measuring what's in there, not changing anything that doesn't need changing.

Carl
plumbbob is online now  
February 12th, 2014, 03:26 AM   #24
Senior Member
 
berglsmerg's Avatar
 
Joined: Aug 2009
From: Charters Towers, Australia

Posts: 1,292
Thanks: 339

I Ride: FE 610 oh yea
Re: Balancing an 80mm 650 crank

Originally Posted by plumbbob
Originally Posted by Taffy
I'd have gone for the taller and I guess heavier piston and got the squish right. those 2002s are miles away. look at the dished piston. it needn't weigh a helluva lot more...

regards

Taffy

I'm just measuring what's in there, not changing anything that doesn't need changing.

Carl
Interesting ! perhaps you can measure the squish height for us all ? It's not difficult.
berglsmerg is offline  
February 12th, 2014, 05:54 AM   #25
Senior Member
 
plumbbob's Avatar
 
Joined: Aug 2008
From: England, Southampton

Posts: 738
Thanks: 140

I Ride: 02 650 StreetTracker, 92 K100 Special, 92 Triumph Cafe Racer.
Re: Balancing an 80mm 650 crank

Originally Posted by berglsmerg

Interesting ! perhaps you can measure the squish height for us all ? It's not difficult.

Can it be measured with the engine in bits?

Carl
plumbbob is online now  
February 12th, 2014, 12:14 PM   #26
Senior Member
 
Joined: Nov 2001
From: Ely, England

Posts: 15,137
Thanks: 351

I Ride:
Re: Balancing an 80mm 650 crank

with the piston on the rod, in the liner, in the left case you can be reasonably close. with both cases together then you're good. in a knackered state...no. get the P & B and little end done first.

anyway, even a tall piston still misses the head by 2mm. this is with the 134mm C to C rod coded '164'.

regards

Taffy
Taffy is offline  
February 21st, 2014, 03:27 AM   #27
Senior Member
 
bushmechanic's Avatar
 
Joined: Jun 2007
From: south east WA Australia

Posts: 3,775
Thanks: 1072

I Ride: 2008 700FK, 2002 628FST
Crank Butchering

machining with carbide was painfully slow so i used a thin 5" cutoff disc $3.50 and all done in about 15 min. gotta love grinders



Dummy pin with a nice centre pivot to hang the bob weight, lead weight triangle substitues makes up the total weight of the real pin + rod + bearing, the bit of metal with holes in it is the bob weight





lighter rod.. a massive 30% lighter and its stronger as well ! I had hoped for more than 20gm but I chickened out with the grinder



Plumbob, Weed has let me know his 644 at 70% BF works fine and reckons 10% either side would also be OK
bushmechanic is offline  
February 21st, 2014, 04:20 AM   #28
Senior Member
 
bushmechanic's Avatar
 
Joined: Jun 2007
From: south east WA Australia

Posts: 3,775
Thanks: 1072

I Ride: 2008 700FK, 2002 628FST
Re: Balancing an 80mm 650 crank

this is Contimans crank



82mm stroke and welded pin.
bushmechanic is offline  
February 21st, 2014, 09:48 AM   #29
Senior Member
 
plumbbob's Avatar
 
Joined: Aug 2008
From: England, Southampton

Posts: 738
Thanks: 140

I Ride: 02 650 StreetTracker, 92 K100 Special, 92 Triumph Cafe Racer.
Re: Balancing an 80mm 650 crank

Cheers Bushie,

I'm going to bolt it all up with the cb out (spacer instead) and see how it goes with my balance factor.

Carl
plumbbob is online now  
February 21st, 2014, 03:49 PM   #30
Senior Member
 
bushmechanic's Avatar
 
Joined: Jun 2007
From: south east WA Australia

Posts: 3,775
Thanks: 1072

I Ride: 2008 700FK, 2002 628FST
Re: Balancing an 80mm 650 crank

sounds good

check out weeds spacer





with the smaller one he broke a lip off the bearing inner

second one has full support for the lip
bushmechanic is offline  
Reply

  Husaberg Forum > Mechanical and Technical > Mechanical

Tags
650, 80mm, balancing, crank



Search tags for this page
Click on a term to search for related topics.
Thread Tools
Display Modes


Similar Threads
Thread Thread Starter Forum Replies Last Post
JBS 700 Kit on welded 80mm Crank bushmechanic Mechanical 170 March 21st, 2015 03:08 AM
crank locking bolt and crank twist bushmechanic Mechanical 25 February 6th, 2009 01:02 PM
Engine Balancing JBSracing Mechanical 9 February 24th, 2008 12:27 PM
CRANKSHAFT BALANCING / COUNTERBALANCE REMOVAL- SWR RACING jacktar01 Husaberg 0 June 6th, 2007 02:40 PM
Crankshaft balancing without counterbalancer, how to verify? PowerFiend Mechanical 7 June 16th, 2004 07:26 AM


Facebook Twitter Google+ RSS Feed