ADVrider

Go Back   ADVrider > Bikes > GSpot > GS Boxers
User Name
Password
Register Inmates Photos Site Rules Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
Old 09-03-2012, 09:30 PM   #2131
tallguy-09
Smile 4 Miles
 
tallguy-09's Avatar
 
Joined: Aug 2009
Location: Vancouver
Oddometer: 1,436
Quote:
Originally Posted by SourKraut View Post
The BMW GS cross spoke wheels have been tubeless since the mid 90's.
...and look much better to me than those "special Wunderlich's"

tallguy-09 is offline   Reply With Quote
Old 09-03-2012, 09:38 PM   #2132
simoneau
Biker/Adventurer/Retiree
 
simoneau's Avatar
 
Joined: Jan 2007
Location: Arlington, Texas
Oddometer: 191
With the wet clutch we finally have a single oil crancase for the engine, transmission and alternator with the subsequent minimum number of shaft oil/air seals involved (actually ony one-the output shaft of the transmission, down from 6) similiar to any modern engine/transmission now available. Reliability should likely rise in accordance.

The engine crankshaft appears to be at the same height in the chassis as the 1200 ADV model, the bottom of the engine is approx 2 in. higher due to the lack of a finned oil pan. This accomplishes mass centralization about the roll axis. The fuel is carried farther aft and lower than the 1200, which is good. The battery is aft of the trans and lower than the 1200. Light airbox is high.

There is very little water onboard since only the heads are cooled by water. The cylinders, except for a little below the head gasket, are air cooled. The extra oil pump and cooling circuit formally used to cool the exhaust is absent. We can only hope the interior alternator is of the same type as Triumph used in their Explorer and not the continuously full power-on variety of the F800/700 series.

I think they got a lot right about this version and if they run more compression as allowed by the better cooling I think 95 ft-lbs torque is achievable with the 4% displacement increase and 120-135 hp depending on the revs allowed.

My $.02.
__________________
Randy
2014 BMW R1200GSA (OLIVE)
Ride it like you stole it, care for it like you'll keep it, never let it cool down and it'll last forever!
simoneau is offline   Reply With Quote
Old 09-03-2012, 09:58 PM   #2133
FlyingFinn
Beastly Adventurer
 
Joined: Jul 2005
Location: San Jose, CA
Oddometer: 1,080
Very good and well informed post! And worth much more than $0.02....

As far as I can see the "Light airbox is high" is THE sole reason why they rotated the heads by 90 degrees.
In this new arrangement the headers are actually on a tighter bends than before but having the intakes to point straight up allows the air box to be high up close to the steering head.
This is the modern way of doing things and BMW is clearly following suit, good for them.

--
Mikko
__________________
"It is not when or how you die but how and if you truly were ever alive!" Dr. Jerri Nielsen FitzGerald
FlyingFinn is online now   Reply With Quote
Old 09-04-2012, 07:28 AM   #2134
ytsiwt
n00b
 
Joined: Aug 2006
Oddometer: 5
Quote:
Originally Posted by rdcyclist View Post
The primary reason for the secondary shaft is to reduce the torque effect of the inline crankshaft. The shaft was left out of the HP2's and the difference in smoothness between the two is negligible. The torque effect difference is NOT negligible...

Doesn't pass the common sense test.



If that was the case the balance shaft would be just a balanced rotating mass not a shaft with off-setting weights. Those off-setting weights match the rocking couple . (if you look you can see the shaft is purposely off balanced).

To counter the rotating crankshaft the rotating mass would also have to be much greater nearing the rotational mass of the crankshaft. Is isn't as the balance shaft is just a small diameter shaft with off-set weighting on each end.

That balance shaft is also timed to crankshaft, be no need to time a simple rotating counter mass but there is a great need to time a balance shaft.
ytsiwt is offline   Reply With Quote
Old 09-04-2012, 07:42 AM   #2135
RichBMW
Beastly Adventurer
 
RichBMW's Avatar
 
Joined: Jul 2012
Location: Surrey, UK
Oddometer: 1,839
Good to see some pictures at last. I really hope they paint the engine black as on my 2012 Triple Black. I had a 30th Anniversary 12GS with the silver engine, and it didn't look as nice as the black engine on the TC, and was a PITA to keep clean.
RichBMW is offline   Reply With Quote
Old 09-04-2012, 08:04 AM   #2136
JStancampiano
PhotoJoe
 
JStancampiano's Avatar
 
Joined: Sep 2006
Location: N GA Mts
Oddometer: 383
Quote:
Originally Posted by SourKraut View Post
The BMW GS cross spoke wheels have been tubeless since the mid 90's.
Yes..but very few (Woodies) can repair and adjust them, I know I had to have woodies straighten mine out (dealer tried 3 new ones that were worse then the ones I had). The new ones look to have a conventional pattern which should be easier to work on. Of course, these photos may not really show the new bike.

Joe
__________________
2007 R1200GS ADV, 1978 R100T, 2009 FJR
JStancampiano is offline   Reply With Quote
Old 09-04-2012, 09:27 AM   #2137
kadesean
eyesuck
 
kadesean's Avatar
 
Joined: Jan 2006
Location: Muskegon, Michigan
Oddometer: 978
If the volume of water is low doesn't that mitigate it's cooling effects as a heat exchanger? And is water (and coolant) necessarily a better medium than oil for said cooling? I guess we assume water is better for cooling than oil because that's what everything uses, but most things that are liquid cooled seem to have a relatively high volume of water as compared to the size of the engine. A liquid cooled 450cc dirt bike has quite a volume of water to cool a relatively small displacement.
__________________
steve-0
kadesean is offline   Reply With Quote
Old 09-04-2012, 09:49 AM   #2138
Marki_GSA
Gnarly Adventurer
 
Joined: Sep 2011
Location: Scotland
Oddometer: 462
Quote:
Originally Posted by FlyingFinn View Post
Very good and well informed post! And worth much more than $0.02....

As far as I can see the "Light airbox is high" is THE sole reason why they rotated the heads by 90 degrees.
In this new arrangement the headers are actually on a tighter bends than before but having the intakes to point straight up allows the air box to be high up close to the steering head.
This is the modern way of doing things and BMW is clearly following suit, good for them.

--
Mikko
The camshafts also run in line with the valves with the new araingment. This means they don't have to bend the motion of the cam to the valve with horrible shaped rockers/followers. It also means if they wanted to they could use direct bucket and shim for vastly reduced valve check intervals or even use hydraulic buckets so no check needed. It would have been impossible to do this with air cooling as one exhaust valve wouldn't have had any cooling. Either way it's a far more efficient design for the valve gear and IMHO far more important than having the air box up high.
Marki_GSA is offline   Reply With Quote
Old 09-04-2012, 11:09 AM   #2139
vtbob
wanderer
 
Joined: Jun 2009
Location: Western Vermont
Oddometer: 523
Quote:
Originally Posted by EJ_92606 View Post
Fact check:

F800GS has 61 lb/ft of torque
R1200GS has 89 lb/ft of torque

Therefore R1200GS has 46% more torque than an F800GS or in your comparison, F800 has 68.5% of the torque of the 1200, not 90% and 67% of the displacement.

But but the 1200 is a tank you might say, right. 516 vs 472 wet...that's less than 10% added weight for those sexy boxer pots.

10% more weight, 46% more torque...I'll take those numbers any day and I did :-)

Source 2012 models on BMW USA website

I stand corrected. Thank you.
I read the false figures on another site, found them surprising and foolishly did not take the time to check them.

Still, I would like to know if any one has seen info the wasser boxer will be lighter, have a better c of g than the current R--GS...
Any indication of variable valve timing?
vtbob is offline   Reply With Quote
Old 09-04-2012, 01:05 PM   #2140
yellowbirdrs
Studly Adventurer
 
yellowbirdrs's Avatar
 
Joined: Jan 2009
Location: Ags. MX
Oddometer: 967
The contender Tiger Explorer XC 2013

Triumph’s shaft-driven 1215 cc triple. Producing 135 bhp with 89 ft. lbs. of torque.


I'll take the blonde
yellowbirdrs is offline   Reply With Quote
Old 09-04-2012, 01:35 PM   #2141
simoneau
Biker/Adventurer/Retiree
 
simoneau's Avatar
 
Joined: Jan 2007
Location: Arlington, Texas
Oddometer: 191
Water is a better medium for heat transfer and the quantity of water is not relavent as long as sufficient flow and radiator capacity dissipates the heat in the water prior to the next heating event in the head. The specific heat of oil and water are directly proportional to their heat dissipation abilities. Water has approx 4.2 where oil has less than 1.7. Low water quantity reduces system weight. The high volume of water represented in most engines surrounds the cylinders and in this engine that is not present.
__________________
Randy
2014 BMW R1200GSA (OLIVE)
Ride it like you stole it, care for it like you'll keep it, never let it cool down and it'll last forever!
simoneau is offline   Reply With Quote
Old 09-04-2012, 02:00 PM   #2142
simoneau
Biker/Adventurer/Retiree
 
simoneau's Avatar
 
Joined: Jan 2007
Location: Arlington, Texas
Oddometer: 191
After analyzing the head photos released earlier, I conclude the cams will again be of the tapered variety and the valves radially splayed just as the vales in the cam heads presently. The difference is both intake cam lobes are on the top cam and both exhaust lobes or on the bottom cam. As for the variable valve timing, there appears to be some extra room in the cam chain gallery, but I wouldn't count on it until later, if ever.
__________________
Randy
2014 BMW R1200GSA (OLIVE)
Ride it like you stole it, care for it like you'll keep it, never let it cool down and it'll last forever!
simoneau is offline   Reply With Quote
Old 09-04-2012, 02:10 PM   #2143
simoneau
Biker/Adventurer/Retiree
 
simoneau's Avatar
 
Joined: Jan 2007
Location: Arlington, Texas
Oddometer: 191
I like what I see in the spoked wheels. The rim is so much easier to clean and the spokes are straight rather than right angle variety used by Triumph and Yamaha. Straight spokes are much stronger and not prone to fatigue or break.
__________________
Randy
2014 BMW R1200GSA (OLIVE)
Ride it like you stole it, care for it like you'll keep it, never let it cool down and it'll last forever!
simoneau is offline   Reply With Quote
Old 09-04-2012, 03:10 PM   #2144
Loutre
Cosmopolitan Adv
 
Loutre's Avatar
 
Joined: Nov 2010
Location: Reaver's Heart :o)
Oddometer: 3,300
Quote:
Originally Posted by simoneau View Post
I like what I see in the spoked wheels. The rim is so much easier to clean and the spokes are straight rather than right angle variety used by Triumph and Yamaha. Straight spokes are much stronger and not prone to fatigue or break.
if it's getting hard to clean just use a toothbrush. That way you show your wife that you love your bike more than her. At least that's what my Gf told me the last time she saw me doing that
__________________
Keep the smile on your face!
Quote:
Originally Posted by Reaver View Post
You can be imitated but not replaced. You're such a special blend the recipe is guarded like KFC's 11 herbs and spices.
Quote:
Originally Posted by Reaver View Post


Loutre is offline   Reply With Quote
Old 09-04-2012, 03:29 PM   #2145
g_e_young
Studly Adventurer
 
g_e_young's Avatar
 
Joined: Sep 2002
Location: N Calif, USA
Oddometer: 867
Quote:
Originally Posted by Motorfiets View Post




What is the story with these pics? Are they leaks from Wunderlich? Or just some photoshop nonsense. I'm sure Wunderlich has seen the bike so it these are leaks, this very well may be the bike in it's final form, along with Wunderlich bits.

g-
__________________
IBA# 15974
www.whatsmyco2.com
g_e_young 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 09:52 PM.


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