Go Back   Motorcycle Forum > Motorcycle.Com General Discussion > Motorcycle General Discussion

Reply
 
Thread Tools
Old 04-29-2013, 04:07 PM   #1
Administrator
Administrator

 
Join Date: Mar 2007
Location: On My Bike
Posts: 3
Default 2013 BMW F800GT Review


Original Article:
2013 BMW F800GT Review

Please discuss the Motorcycle.com article 2013 BMW F800GT Review in our Motorcycle Forums below. Use the reply button to let others know your comments or feedback on the article. Constructive criticism is always appreciated, along with your thoughts and personal opinions on the bikes and products we have tested.
Administrator is offline   Reply With Quote

Sponsored Links Remove Advertisements
Motorcycle Forum
Advertisement
Old 04-29-2013, 05:25 PM   #2
jmdonald
Founding Member
 
jmdonald's Avatar
 
Join Date: Jun 2007
Location: Mission Viejo
Posts: 1,291
Default Nice.

This is a really nice bike. There are a few miss hits but the changes make up for them. At less than 500lbs. it will make a good commuter. Well done BMW.
__________________
Secede.
jmdonald is offline   Reply With Quote
Old 04-30-2013, 05:59 AM   #3
The Spaceman
Registered Member
 
The Spaceman's Avatar
 
Join Date: Aug 2011
Posts: 2,448
Default

There's frequent criticism here about overweight, oversized ST bikes. This should answer that.

I'm sure its true, but saying that having both pistons rising and falling together reduces vibration seems counterintuitive. Wouldn't having more weight at each end if the stroke be more unbalanced and thus create more vibes? If anyone can explain that is appreciate it.
__________________
318 curves in 11 miles."

Last edited by The Spaceman : 04-30-2013 at 06:02 AM.
The Spaceman is offline   Reply With Quote
Old 04-30-2013, 06:44 AM   #4
jmdonald
Founding Member
 
jmdonald's Avatar
 
Join Date: Jun 2007
Location: Mission Viejo
Posts: 1,291
Default BMW explains from BMW Motorrad International

Quote:
Originally Posted by The Spaceman View Post
There's frequent criticism here about overweight, oversized ST bikes. This should answer that.

I'm sure its true, but saying that having both pistons rising and falling together reduces vibration seems counterintuitive. Wouldn't having more weight at each end if the stroke be more unbalanced and thus create more vibes? If anyone can explain that is appreciate it.


Unavoidable on two cylinder engines, the first and second order inertial forces are neutralised by a balancing mechanism that is unique in our times. Instead of the conventional solution involving so called balancing or counterweight shafts, the oscillating inertial forces are eliminated by a system of articulated joints, positioned centrally on the crankshaft, comprising a predefined arrangement of counterweight masses. Arranged opposite to the crank pin, an eccentric on the crankshaft carries a so called balance rod. This rod is joined to a balance pivot. The kinematics are such that the balance rod moves up and down counter to the movements of the two piston rods. The movements over the relatively long swing arm gives rise to a relatively linear swinging motion for the rod end. The distribution of mass over the rod end and swing arm is such that the inertial forces generated by the swinging motion counteract the inertial forces generated by the crankshaft (piston and rod section) at all positions. This virtually eliminates the first and second order inertial forces, and the engine runs with low vibration levels. One other major advantage of this elegant design is its low noise levels because there are no gears or chains with their characteristic drive sounds.

BMW Motorrad International
__________________
Secede.

Last edited by jmdonald : 04-30-2013 at 07:35 AM.
jmdonald is offline   Reply With Quote
Old 04-30-2013, 07:52 AM   #5
Buzglyd
Founding Member
 
Buzglyd's Avatar
 
Join Date: Nov 2001
Posts: 10,904
Default

^ What he said.

I2 engines rock side to side rather than fore and aft.

That's why they do the cylinders at the same time.

Triumph does a 270 crank on some models to give it more potato potato or whatever the hell produce item they have over there that sounds like an engine.
Buzglyd is offline   Reply With Quote
Old 04-30-2013, 09:04 AM   #6
The Spaceman
Registered Member
 
The Spaceman's Avatar
 
Join Date: Aug 2011
Posts: 2,448
Default

I read about BMW's balance rod solution that JM referenced. It's clever, no doubt.

But why not have one piston hitting TDC while the other hits BDC? That's how my Vee's 90-degree twin achieved balance without weights or rods. HD throws both pistons up and down together on their Vee, which creates their unique engine "experience."

I reject the inline twin engine for it's inherent design failures! All manufacturers should immediately cease and desist their construction forthwith and replace them with V-4s!
__________________
318 curves in 11 miles."
The Spaceman is offline   Reply With Quote
Old 04-30-2013, 09:13 AM   #7
sliphorn
Registered Member
 
Join Date: Nov 2001
Posts: 200
Default

Nice bike! If only Triumph would get off their duffs and come out with an 800 ST/GT. They got the motor, it should be a no brainer.

I'm a Triumph guy, what can I say?
sliphorn is offline   Reply With Quote
Old 04-30-2013, 10:37 AM   #8
bbtowns
Founding Member
 
Join Date: Jun 2007
Posts: 540
Default Thanks to the BMW's PR Department

Man, was this written by the PR department at BMW? 700-800 lbs. sport tourers in the article you reference? Only one was over 700 lbs., at 730, the other two were below 700 wet, and of course none was 800 lbs.
This does look like a nice sedate sport tourer admittedly, enough power to get around, decent looking, and light enough to have some fun with. Too bad it's not easier to get at it's base price, though given it appear that doesn't even include luggage mounts, maybe that's not so practical after all.
__________________
What kind of man can abandon his family like that?
Seriously, who is he, I'd like lessons.
bbtowns is offline   Reply With Quote
Old 04-30-2013, 02:44 PM   #9
schizuki
Founding Member
 
schizuki's Avatar
 
Join Date: Nov 2001
Posts: 5,030
Default

That's a Beemer I'd buy.
__________________
Reverēre meam auctōritātem

Bill Clinton and Chuck Schumer are praising the Supreme Court for overturning an anti-gay-marriage law that they both signed.
schizuki is offline   Reply With Quote
Old 04-30-2013, 03:46 PM   #10
sliphorn
Registered Member
 
Join Date: Nov 2001
Posts: 200
Default

Quote:
Originally Posted by schizuki View Post
That's a Beemer I'd buy.
Me too. It's the perfect solo tourer.
sliphorn is offline   Reply With Quote
Reply


Thread Tools

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

vB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are Off
Pingbacks are Off
Refbacks are Off