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Author Topic: Hows your vibes?  (Read 3572 times)

cyrusb

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Hows your vibes?
« on: December 28, 2007, 06:51:24 PM »
Having only one other bullet to compare mine to I was wondering how other bikes fare vibration -wise. Since these bikes have built up cranks,this leaves a lot of latitude in their alignment at the factory, and therefore allows for some differences bike to bike in overall balance. If anyone has had some experience with older Harley's, the difference between identical bikes was sometimes really pronounced. So heres the test, at idle on a fairly level hard surface how long will your bullet stay in one spot? I had a triumph 500 twin that would go 3 feet in a minute. I consider myself lucky with my bullet at about a half inch in a minute. Of course this is all added to the overall balance of the engines rotating parts which on production bikes is done statistically, where there can be some pretty big differences also. This is why it is so important to match the weight of a new piston to the old when doing a replacement or going big bore. Anyway, it's just a simple test, hope you have a smoothie.
« Last Edit: December 28, 2007, 07:13:02 PM by cyrusb »

LotusSevenMan

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Re: Hows your vibes?
« Reply #1 on: December 28, 2007, 07:50:08 PM »
Interesting!
I suppose it could be seen as a test of centre stands too as to whether the rear wheel touches as well as the front when on the stand. Both my wheels touch and the bike goes nowhere at all on the level pavement (sidewalk I think in US terms) outside my house. In fact if it did I'd be very concerned!!!
I guess tickover speed is also important. No tacho on mine but I can count the exhaust 'beat' fairly easily.  ;D
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cyrusb

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Re: Hows your vibes?
« Reply #2 on: December 28, 2007, 08:04:41 PM »
Mine has both wheels on the ground too, the rear just grazes the ground. Assuming everyones idle is about the same, sounds like you have good balance. Balance usually runs the gamut from smooth as silk to making your brain itch.

jdrouin

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Re: Hows your vibes?
« Reply #3 on: December 28, 2007, 09:21:01 PM »
Check out this 350 Military in Japan. To my eye the cup of water indicates a fairly smooth operation, as it seems to have taken more than 4 minutes to fall off.

http://www.youtube.com/watch?v=F48Kuc8VId4

Kind of a wacky video to make, anyway. I'm surprised it held my interest so long.

cyrusb

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Re: Hows your vibes?
« Reply #4 on: December 28, 2007, 10:22:42 PM »
Thats great, I think its an even better test!

LotusSevenMan

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Re: Hows your vibes?
« Reply #5 on: December 29, 2007, 02:07:22 AM »
LOVL. Had to be Japan eh?

Hmmm; what about the drop of water that splashes out at 01: 14 mins then? What a daft video clip and hardly @ tickover ha ha  ;D
Was he coughing because of the emissions?  ::)
If it ain't broke-------------------------- fix it 'till it is!

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scoTTy

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Re: Hows your vibes?
« Reply #6 on: December 29, 2007, 02:46:17 AM »
Quote
how long will your bullet stay in one spot? I had a triumph 500 twin that would go 3 feet in a minute. I consider myself lucky with my bullet at about a half inch in a minute.

 depend on how much gas I give it..  I usually stop b4 it  escapes the garage

LotusSevenMan

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Re: Hows your vibes?
« Reply #7 on: December 29, 2007, 04:04:44 AM »
"I usually stop b4 it  escapes the garage"  :D

With or without you on board?  :o
If it ain't broke-------------------------- fix it 'till it is!

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scoTTy

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Re: Hows your vibes?
« Reply #8 on: December 29, 2007, 10:57:33 PM »
without.. this bike has a mind of it's own..  reminds me of this http://www.youtube.com/watch?v=aJ5M11m9vI0

LotusSevenMan

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Re: Hows your vibes?
« Reply #9 on: December 30, 2007, 12:11:43 PM »
Ah Scotty.

A bit O/T but.........
One of my favourite films of all time this 'Christine'. Love the concept of a car (or an inanimate object) with a soul..................... even one as black as that!
In fact, I find that a much scarier concept than say, the Exorcist which my girlfriend (educated by nuns in a convent school) finds terrifying.  ::)
If it ain't broke-------------------------- fix it 'till it is!

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cyrusb

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Re: Hows your vibes?
« Reply #10 on: December 31, 2007, 01:16:08 PM »
I think the bike finally dumped the cup trying to get some cooling.

jdrouin

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Re: Hows your vibes?
« Reply #11 on: December 31, 2007, 03:57:35 PM »
I think there's an interesting physics question there, too. Did the cup move off the bike or did the bike vibrate out from under it?

cyrusb

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Re: Hows your vibes?
« Reply #12 on: December 31, 2007, 04:21:04 PM »
Or did the world roll out from underneath it?  I'm pleasantly surprised at the lack of vibration considering that there is no counterbalacer in the engine.I was really expecting more. It's the sustained high frequency vibration that causes all the cracks and broken parts that some people describe. The trick is to run the engine below that threshhold, it might keep the front fender stays and chainguard tabs in one piece. Oh, and the martini on the seat.....

LotusSevenMan

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Re: Hows your vibes?
« Reply #13 on: December 31, 2007, 04:37:49 PM »
The trick is to run the engine below that threshhold, it might keep the front fender stays and chainguard tabs in one piece. Oh, and the martini on the seat.....

Shaken not stirred I believe Mr Bond!
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Thumper

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Re: Hows your vibes?
« Reply #14 on: December 31, 2007, 05:13:59 PM »
Check out this 350 Military in Japan. To my eye the cup of water indicates a fairly smooth operation, as it seems to have taken more than 4 minutes to fall off.

http://www.youtube.com/watch?v=F48Kuc8VId4

Kind of a wacky video to make, anyway. I'm surprised it held my interest so long.

Cup of water?

What would *you* film if your cup of *vodka* was half empty?

 :D

Matt

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Re: Hows your vibes?
« Reply #15 on: December 31, 2007, 06:52:36 PM »
I'm pleasantly surprised at the lack of vibration considering that there is no counterbalacer in the engine.I was really expecting more.

The crankshaft is balanced (or counterbalanced) in of itself.  Obviously no outboard to the crank counterbalance system like modern bike engines.

The crankshaft side plates have enough mass to also act as flywheels.  No external flywheel is necessary.

Older basic engineering that's proven and works.

Regards, Foggy
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cyrusb

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Re: Hows your vibes?
« Reply #16 on: December 31, 2007, 07:45:54 PM »
I hear that. Maybe I should have said I was surprised at the smoothness it has without an external balancer. Been on many late model singles with extra balance  units that were not any smoother than my bullet. Of course these were over square modern singles that ran at high rpms. I think the undersquare re engines with  their low end power is a big help vibration wise, to a point. I can still overdo it and cause blurred vision.

jonapplegate

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Re: Hows your vibes?
« Reply #17 on: January 05, 2008, 06:20:09 AM »
My bike is actually pretty smooth and while you can see a little vibration when it is idling on center stand, back wheel is off the ground by the way, it certainly is not enough to vibrate it very far. I have to admit that after all I had heard about vibration, I was a little disappointed there WASN'T a little more vibe!

birdmove

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Re: Hows your vibes?
« Reply #18 on: January 05, 2008, 07:16:32 AM »
    Mine seems to,at least, idle smoother than the one I test rode.On that one the front wheel was really moving with the engine vibrations.

    jon in Puyallup
Jon in Keaau, Hawaii

alwscout

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Re: Hows your vibes?
« Reply #19 on: January 05, 2008, 02:14:21 PM »
I can't put much on the seat without it falling off after a few seconds...gloves, goggles, hat, wrench, etc............

Adam
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LotusSevenMan

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Re: Hows your vibes?
« Reply #20 on: January 05, 2008, 11:32:14 PM »
I can't put much on the seat without it falling off after a few seconds...gloves, goggles, hat, wrench, etc............

Adam

All this BEFORE you go and start it up too !!!
If it ain't broke-------------------------- fix it 'till it is!

Royal Enfield Miltary 500cc  (2003)
Honda VTR FireStorm (SuperHawk) 996cc 'V' twin
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alwscout

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Re: Hows your vibes?
« Reply #21 on: January 06, 2008, 01:03:33 AM »
LOL!!!!!!!

Well I do need some coffee first thing to get my mind right!!!!

Adam
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