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 01-08-2014, 12:45 AM   #1
jigginjim OP
Adventurer
 
jigginjim's Avatar
 
Joined: Jan 2013
Location: Devon, England
Oddometer: 36
99 R1100s motor in a 98 R1100GS?

Hi all, does anyone know of any issues with swapping my GS motor with an S motor? Ive been told that I can just stick my transmission on and job done. Anyone done the same?
jigginjim is offline   Reply With Quote
Old 01-08-2014, 06:29 AM   #2
JimVonBaden
"Cool" Aid!
 
JimVonBaden's Avatar
 
Joined: Feb 2005
Location: Alexandria, VA
Oddometer: 48,077
It will certainly bolt up. If you are keeping all the peripherals from the GS and just swapping in the long block you will be OK. The physical motor dimensions are the same. There might be an interesting performance effect mixing the motor with the GS fueling and timing though. Probably be fine.

This will not be a simple swap though, as basically the bike will be nearly completely disassembled to swap motors.

Jim
JimVonBaden is offline   Reply With Quote
Old 01-08-2014, 07:21 AM   #3
jigginjim OP
Adventurer
 
jigginjim's Avatar
 
Joined: Jan 2013
Location: Devon, England
Oddometer: 36
Thumbs down 99 R1100s motor in a 98 R1100GS?

I guess the major problem will be with the headers as they are a different shape. Hopefully someone will have tried the same and be able to share their knowledge.
jigginjim is offline   Reply With Quote
Old 01-08-2014, 07:57 AM   #4
GS Addict
Pepperfool
 
GS Addict's Avatar
 
Joined: Sep 2006
Location: Sunshine Coast B.C.
Oddometer: 3,347
Ask the boys at Beemer Boneyard. They have helped me with similar questions in the past.
Great guys!
__________________
Old enough to know better....
Young enough to try it again
GS Addict is offline   Reply With Quote
Old 01-08-2014, 10:59 AM   #5
JimVonBaden
"Cool" Aid!
 
JimVonBaden's Avatar
 
Joined: Feb 2005
Location: Alexandria, VA
Oddometer: 48,077
Quote:
Originally Posted by jigginjim View Post
I guess the major problem will be with the headers as they are a different shape. Hopefully someone will have tried the same and be able to share their knowledge.
Not a big deal, go aftermarket.

Jim
JimVonBaden is offline   Reply With Quote
Old 01-08-2014, 11:41 AM   #6
Mike Figielski
Gnarly Adventurer
 
Joined: Jul 2003
Location: Randolph, NJ
Oddometer: 465
Quote:
Originally Posted by GS Addict View Post
Ask the boys at Beemer Boneyard. They have helped me with similar questions in the past.
Great guys!
Yes, headers will be an issue as the R1100GS uses a 3 stud pattern for the header to head junction and the R11S uses a 2 stud pattern. Otherwise it should bolt right up and as long as you use the Motronic, TBs and injectors, and clutch from the R1100GS you should be fine. You'll also need to use the Hall sensor from your GS if you want the connectors to plug into your GS harness. Hope this helps,
Mike
__________________
Mike Figielski

Check Out:
beemerboneyard.com
Mike Figielski is offline   Reply With Quote
Old 01-08-2014, 02:23 PM   #7
jigginjim OP
Adventurer
 
jigginjim's Avatar
 
Joined: Jan 2013
Location: Devon, England
Oddometer: 36
Will the GS exhaust headers fit into the S exhaust port? I assume if they will fit into the ports that there must be a way of clamping them in. Im amazed my headers are sealing at the ports as two of the stud and bolts have rusted away to nothing on both sides, so effectively both headers are clamped with one nut!
jigginjim is offline   Reply With Quote
Old 01-08-2014, 02:33 PM   #8
Mike Figielski
Gnarly Adventurer
 
Joined: Jul 2003
Location: Randolph, NJ
Oddometer: 465
Quote:
Originally Posted by jigginjim View Post
Will the GS exhaust headers fit into the S exhaust port? I assume if they will fit into the ports that there must be a way of clamping them in. Im amazed my headers are sealing at the ports as two of the stud and bolts have rusted away to nothing on both sides, so effectively both headers are clamped with one nut!
No, only way it would work would be to cut the 1st few inches of the S headers off and weld them onto the GS headers.
__________________
Mike Figielski

Check Out:
beemerboneyard.com
Mike Figielski is offline   Reply With Quote
Old 01-09-2014, 04:04 AM   #9
balush
Adventurer
 
balush's Avatar
 
Joined: Oct 2008
Location: The 20th century
Oddometer: 10
did it with an RT engine

Hi,
I installed a 98 RT engine in my 94 GS, no problem at all. Bike is fine and still runs great after about 80K kilometers. haven't changed anything else and it started right up.
__________________
Never made it to this Millennium:

1999 KTM 300 EGS
1994 R1100GS
1994 KTM 620 EGS
1993 Ducati 750ss
1983 Moto-Guzzi V65SP
1983 Suzuki Katana 750
1980 Suzuki GSX1100
1961 BSA M21
balush is offline   Reply With Quote
Old 01-09-2014, 06:11 AM   #10
Mike Figielski
Gnarly Adventurer
 
Joined: Jul 2003
Location: Randolph, NJ
Oddometer: 465
Quote:
Originally Posted by balush View Post
Hi,
I installed a 98 RT engine in my 94 GS, no problem at all. Bike is fine and still runs great after about 80K kilometers. haven't changed anything else and it started right up.
Yep, R1100RT has the same header bolt pattern on the heads as the R1100GS. R1100S and all 1150 models use the 2 bolt pattern and won't fit up.
__________________
Mike Figielski

Check Out:
beemerboneyard.com
Mike Figielski is offline   Reply With Quote
Old 01-09-2014, 06:54 AM   #11
JimVonBaden
"Cool" Aid!
 
JimVonBaden's Avatar
 
Joined: Feb 2005
Location: Alexandria, VA
Oddometer: 48,077
Quote:
Originally Posted by Mike Figielski View Post
Yep, R1100RT has the same header bolt pattern on the heads as the R1100GS. R1100S and all 1150 models use the 2 bolt pattern and won't fit up.
Mike, shouldn't the 1150 GS exhaust work? If you don't have one, someone likely does since so many remove it.

Or, like I said, go aftermarket altogether. More expensive though.

Jim
JimVonBaden is offline   Reply With Quote
Old 01-09-2014, 06:59 AM   #12
Mike Figielski
Gnarly Adventurer
 
Joined: Jul 2003
Location: Randolph, NJ
Oddometer: 465
Quote:
Originally Posted by JimVonBaden View Post
Mike, shouldn't the 1150 GS exhaust work? If you don't have one, someone likely does since so many remove it.

Or, like I said, go aftermarket altogether. More expensive though.

Jim
1150GS full exhaust should work. Will definitely bolt up to the R1100S heads. Might have to make a bracket for the muffler in the back.
__________________
Mike Figielski

Check Out:
beemerboneyard.com
Mike Figielski is offline   Reply With Quote
Old 01-09-2014, 07:03 AM   #13
JimVonBaden
"Cool" Aid!
 
JimVonBaden's Avatar
 
Joined: Feb 2005
Location: Alexandria, VA
Oddometer: 48,077
Quote:
Originally Posted by Mike Figielski View Post
1150GS full exhaust should work. Will definitely bolt up to the R1100S heads. Might have to make a bracket for the muffler in the back.
That is what I thought. I wasn't sure if there would be any interference issues because of frame differences.

Thanks,

Jim
JimVonBaden is offline   Reply With Quote
Old 01-09-2014, 11:07 AM   #14
jigginjim OP
Adventurer
 
jigginjim's Avatar
 
Joined: Jan 2013
Location: Devon, England
Oddometer: 36
Question

Thanks for all the tips guys. What is really strange is that no-one else seems to have done it. Do you think that using the GS motronic and fueling/gearing will negate the extra horses?
jigginjim is offline   Reply With Quote
Old 01-09-2014, 11:43 AM   #15
Mike Figielski
Gnarly Adventurer
 
Joined: Jul 2003
Location: Randolph, NJ
Oddometer: 465
Quote:
Originally Posted by jigginjim View Post
Thanks for all the tips guys. What is really strange is that no-one else seems to have done it. Do you think that using the GS motronic and fueling/gearing will negate the extra horses?
The main difference you'll get with the S motor is higher compression (11.3:1 vs 10.3:1 on the GS I believe) and slightly hotter cams. The effect will be more torques throughout the rev range and a move up the rpm range for peak HP and torque. Expect power to come on around 500-700 rpms higher in the rev range. You will likely get 5-7 more HP. Remember you are not using the R11S Motronic or exhaust and you won't have the short fat R11S TB intake tubes which are responsible for some of the claimed difference in HP. I think it will work out well though. Higher compression and hotter cams always equals more power even if all else is equal.
__________________
Mike Figielski

Check Out:
beemerboneyard.com
Mike Figielski 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 09:46 AM.


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