ADVrider

Go Back   ADVrider > Riding > The perfect line and other riding myths
User Name
Password
Register Inmates Photos Site Rules Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
Old 01-31-2014, 04:54 PM   #16
markk53
jack of all trades...
 
markk53's Avatar
 
Joined: Dec 2007
Location: Delaware Ohio
Oddometer: 7,749
Quote:
Originally Posted by joexr View Post
What the hell is a SpeedTuna?
He also has problems with the engine running rough, as Joe Walsh put it, "You can tune a piano, but you can't tuna fish."
__________________
Ever get lost? You know, that good kind of lost - come to a dirt road intersection and you have no idea where you are or which way to turn? I like when that happens!

Mark - klx678
95 KLX650C w/Vulcan piston bigbore, Now an 09 KLX250S, selling my 90 Zephyr 550
markk53 is offline   Reply With Quote
Old 01-31-2014, 05:52 PM   #17
Barnone
Beastly Adventurer
 
Barnone's Avatar
 
Joined: Mar 2007
Location: WNC SWFL
Oddometer: 3,850
Quote:
Originally Posted by markk53 View Post
And you've gained this great insight by removing the weights on how many bikes?
One bike was all he needed to prove his point.
__________________
Vince @ SWFL or WNC 2001 Kawasaki W650
2012 Dong Fang DF250RTB hard tail bobber
2014 Sky Team ST125-8A Z50 clone monkey bike
2014 Ice Bear PBZ110-1P Z50 clone monkey sidecar
2014 Sky Team MC-D34 CT70 clone
Barnone is offline   Reply With Quote
Old 01-31-2014, 06:02 PM   #18
Pantah
Red Sox Nation
 
Pantah's Avatar
 
Joined: Oct 2004
Location: India Wharf
Oddometer: 10,073
Exactly how does one "shift the resonance point of the bars to some other point of the operating range"?

The guy asked a question and you invent some sort of scientific response for personal effect, yet useless to your audience.

Too many people like you on this site.

Quote:
Originally Posted by godwinmt View Post
Bar weights cannot eliminate handlebar vibrations, they merely serve to shift the resonance point of the bars to some other point in the operating range. The 'vibrations' people notice are a resonance mode in the bars. You can shift where this resonance point is by either altering the mass or stiffness of the bars. Increasing the mass and decreasing the stiffness shifts the resonance point lower in the revs, and doing the opposite shifts it farther north.

You by lightening your bars are shifting the point farther north in the revs. I imagine if you ride a little faster, you'll again find the point where the bars do vibrate, just not where you ride most of the time.

It's Vibes...nothing more, nothing less.

-M
__________________
Straight ahead and faster -Bo Weaver 1970
"There I was..." -Griffin Niner Three Hotel
"One day closer to a parade..." Jonny Gomes, spring training 2013
Pantah is offline   Reply With Quote
Old 01-31-2014, 06:23 PM   #19
Night Falcon
Adventure NZL
 
Night Falcon's Avatar
 
Joined: Dec 2008
Location: Nu Va Ze Lon
Oddometer: 1,616
cool....another Myth Busting Myth Busted, busted myth thread
__________________
My KTM 390 Adventure - we live in hope!
My KTM 690 - RIP
My Rev3 Trials Adventures
Night Falcon is offline   Reply With Quote
Old 01-31-2014, 07:46 PM   #20
tkent02
Beastly Adventurer
 
Joined: Dec 2008
Location: Littleton, CO
Oddometer: 2,165
Quote:
Originally Posted by Pantah View Post
Exactly how does one "shift the resonance point of the bars to some other point of the operating range"?
How can this be useless? That is exactly what the weights do.
tkent02 is online now   Reply With Quote
Old 01-31-2014, 08:12 PM   #21
k-moe
Beastly Adventurer
 
Joined: Jun 2012
Oddometer: 2,394
Quote:
Originally Posted by Pantah View Post
Exactly how does one "shift the resonance point of the bars to some other point of the operating range"?
One does this by changing the mass of the bars (adding weight). More mass absorbs more energy, causing the resonant frequency of the assembly to change. This is not some BS, it's physics...the same sort of science that explains how internal combustion engines work, and allows manufacturers to make shit for us to buy
k-moe is offline   Reply With Quote
Old 02-01-2014, 02:28 AM   #22
FrogAndTrumpet
Adventurer
 
Joined: Jan 2014
Location: Don't ask me, I'm lost too!
Oddometer: 82
Quote:
Originally Posted by markk53 View Post
He also has problems with the engine running rough, as Joe Walsh put it, "You can tune a piano, but you can't tuna fish."


Actually the engine runs pretty smooth (I mean it's only got 26,000-odd km on the clock; bear in mind this is a 2002 bike), although I might soon update the fuelling map and make sure the throttle bodies are perfectly balanced.
__________________
Fork 'andles
FrogAndTrumpet is offline   Reply With Quote
Old 02-01-2014, 04:14 AM   #23
tvpierce
Gnarly Adventurer
 
tvpierce's Avatar
 
Joined: Sep 2011
Location: Maine
Oddometer: 323
Quote:
Originally Posted by Pantah View Post
Exactly how does one "shift the resonance point of the bars to some other point of the operating range"?

The guy asked a question and you invent some sort of scientific response for personal effect, yet useless to your audience.

Too many people like you on this site.
Umm... I think this explains it:

Quote:
Originally Posted by toates89 View Post
Frequency is equal to the spring constant over mass

omega=k/m

As mass increases omega decreases.
Just sayin'!
__________________
The laws of the road are superseded by the laws of physics.

"But I had the right of way!" makes a pretty crappy epitaph.
tvpierce is online now   Reply With Quote
Old 02-01-2014, 08:45 AM   #24
Colorado_Rider OP
Beastly Adventurer
 
Colorado_Rider's Avatar
 
Joined: Mar 2013
Location: Failville, CO
Oddometer: 1,046
Quote:
Originally Posted by k-moe View Post
One does this by changing the mass of the bars (adding weight). More mass absorbs more energy, causing the resonant frequency of the assembly to change. This is not some BS, it's physics...the same sort of science that explains how internal combustion engines work, and allows manufacturers to make shit for us to buy
It's not BS but for this particular application more mass is not always better. It's not about absorbing energy, it's about matching (or cancelling) the vibration to the bars generated by the engine. I've added weight to 3 different bikes, never helped a thing, Taken weight off 2, made all the difference.

I wasn't trying to preach any facts, just put it out there, markk.

Colorado_Rider screwed with this post 02-01-2014 at 08:50 AM
Colorado_Rider is offline   Reply With Quote
Old 02-01-2014, 10:50 AM   #25
k-moe
Beastly Adventurer
 
Joined: Jun 2012
Oddometer: 2,394
Quote:
Originally Posted by Colorado_Rider View Post
It's not BS but for this particular application more mass is not always better. It's not about absorbing energy, it's about matching (or cancelling) the vibration to the bars generated by the engine. I've added weight to 3 different bikes, never helped a thing, Taken weight off 2, made all the difference.

I wasn't trying to preach any facts, just put it out there, markk.
In that case, a more appropriate thread title would be helpful. How about: "Does Adding Weight Always Reduce Vibration in Handlebars?"
The title, "Bar Weight Myth" implies that added mass has no effect on vibration. The implication was reinforced with your first post, where you stated that, in your experience, removing weight is better than increasing it.

k-moe screwed with this post 02-01-2014 at 10:55 AM
k-moe is offline   Reply With Quote
Old 02-03-2014, 04:06 PM   #26
AKDuc
Alaska Born Ducatisti
 
AKDuc's Avatar
 
Joined: Apr 2006
Location: Anchorage, Alaska
Oddometer: 6,520
Quote:
Originally Posted by markk53 View Post
And you've gained this great insight by removing the weights on how many bikes?
For me it's at least 5, most with after-market bars and all with engine/exhaust mods.

Those bikes include a '07 KLR with Moose Racing bars w/o any guards, '05 Ducati Monster S4R w/trimmed stock bars, and the following 3 bikes with the Heli brand bars: '98 Ducati 748, '00 Ducati 996, and a '05 Triumph Daytona 955. They've all been buzz free thru the entire rpm range for many years/miles.

Have fun, Mark H.

AKDuc screwed with this post 02-03-2014 at 07:48 PM
AKDuc is offline   Reply With Quote
Old 02-03-2014, 04:56 PM   #27
hippiebrian
Beastly Adventurer
 
Joined: Jun 2012
Location: Long Beach, Ca.
Oddometer: 2,895
What is the horsepower of your bike? And how much do the bar ends weigh? Can you really feel the power difference enough to remove them?

Sounds like nothing but bench racing "I've dropped more grams than you" thinking rather than any kind of real world power/weight ratio difference. Heck, I lose more bike weight when I take a dump than I would with removing bar end weights.
hippiebrian is offline   Reply With Quote
Old 02-03-2014, 05:37 PM   #28
k-moe
Beastly Adventurer
 
Joined: Jun 2012
Oddometer: 2,394
Quote:
Originally Posted by hippiebrian View Post
What is the horsepower of your bike? And how much do the bar ends weigh? Can you really feel the power difference enough to remove them?

Sounds like nothing but bench racing "I've dropped more grams than you" thinking rather than any kind of real world power/weight ratio difference. Heck, I lose more bike weight when I take a dump than I would with removing bar end weights.
That is nothing like what the OP is claiming. He's after comfort, not weight loss.
k-moe is offline   Reply With Quote
Old 02-03-2014, 06:55 PM   #29
DAKEZ
Beastly Adventurer
 
DAKEZ's Avatar
 
Joined: Mar 2007
Location: OR
Oddometer: 19,545
Bar end weight has worked well for me on several different Thumpers. Suzuki, BMW, Yamaha, Honda. I will sometimes do 500/600 mile days on them to get to where I am going so NOT being "vibey" is important to me.

I think I'll stick with them as they work.
__________________
“Watch out for everything bigger than you, they have the "right of weight"
Bib
DAKEZ is offline   Reply With Quote
Old 02-04-2014, 07:29 AM   #30
docwyte
Studly Adventurer
 
docwyte's Avatar
 
Joined: Dec 2012
Location: Denver, CO
Oddometer: 910
Bar end weights and anti vibe inserts made a huge difference on my KTM 640 Adv.
__________________
'06 KTM 640 Adventure
docwyte is offline   Reply With Quote
Reply

Share

Thread Tools Search this Thread
Search this Thread:

.
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump


Times are GMT -7.   It's 01:36 PM.


Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright ADVrider 2011-2014