The Sportster and Buell Motorcycle Forum - The XLFORUM®
 

Go Back   The Sportster and Buell Motorcycle Forum - The XLFORUM® > SPORTSTER MOTORCYCLE FORUM > Sportster Motorcycle General Discussion and Problems
XLF Blogs XLF Arcade XLF Disclaimer/Privacy Statement/Terms Of Use

Notices

Sportster Motorcycle General Discussion and Problems For discussing problems about your Sportster motorcycle that don't fit anywhere else.

Active Threads
0 Need some info for my small stroker build
Last Post: RKN
Posted On: 23 Minutes Ago
Replies: 108
Views: 7,383
0 Coulda' - Shoulda' - Woulda' - Solenoid/Bendix?
Last Post: ZTatZAU
Posted On: 38 Minutes Ago
Replies: 45
Views: 803
0 Parts manuals?
Last Post: Jhbox13
Posted On: 38 Minutes Ago
Replies: 22
Views: 673
0 Hottie of the day, no nudity.
Last Post: cal43
Posted On: 2 Hours Ago
Replies: 33,956
Views: 4,088,362
0 Keep & Kill
Last Post: Graywolf
Posted On: 2 Hours Ago
Replies: 26,816
Views: 1,556,194
0 Short in electrical system? Confused about points and ignition coil
Last Post: ironbar
Posted On: 2 Hours Ago
Replies: 5
Views: 50
0 85 Ironhead, Kiffy Stand Question
Last Post: ironbar
Posted On: 3 Hours Ago
Replies: 2
Views: 97
0 You asked for it! "The Tess' Coffee Thread"
Last Post: sportsterpaul
Posted On: 5 Hours Ago
Replies: 11,147
Views: 1,107,082
0 This week on Craig's list
Last Post: Ferrous Head
Posted On: 6 Hours Ago
Replies: 5,410
Views: 905,320
0 90's XLH shifter
Last Post: RandallM
Posted On: 7 Hours Ago
Replies: 0
Views: 40
0 What is this shifter?
Last Post: Hippysmack
Posted On: 7 Hours Ago
Replies: 10
Views: 309
0 Can't install kickstand spring
Last Post: Ferrous Head
Posted On: 8 Hours Ago
Replies: 23
Views: 1,611
0 Hot Rods, Rat Rods, and Customs.
Last Post: Graywolf
Posted On: 8 Hours Ago
Replies: 4,928
Views: 1,012,527
0 Official XL Forum Random Image Thread (NO NUDITY!)
Last Post: Stairman
Posted On: 8 Hours Ago
Replies: 52,994
Views: 8,978,124
0 Another question re: Microsquirt
Last Post: Iron Mike
Posted On: 9 Hours Ago
Replies: 26
Views: 1,022
0 Oil system prime
Last Post: rejeanprimeau
Posted On: 9 Hours Ago
Replies: 19
Views: 3,733
0 This is gonna hurt.
Last Post: wedge
Posted On: 10 Hours Ago
Replies: 9,252
Views: 2,184,762
0 Video - More FELT Torque For UNDER $30! BEST BANG FOR THE BUCK!
Last Post: DK Custom
Posted On: 12 Hours Ago
Replies: 0
Views: 51
0 oil pressure sensor worth cleaning?
Last Post: Tomcatt
Posted On: 12 Hours Ago
Replies: 3
Views: 228
5 Frankenstein forks- preload?
Last Post: Tomcatt
Posted On: 13 Hours Ago
Replies: 39
Views: 1,297
8 72 XLCH Dies after 2-3 minutes consistently
Last Post: tiderider
Posted On: 14 Hours Ago
Replies: 19
Views: 454
0 Digital volt meter
Last Post: Tomcatt
Posted On: 15 Hours Ago
Replies: 2
Views: 143
0 Allegheny National Park III
Last Post: mick42
Posted On: 15 Hours Ago
Replies: 87
Views: 5,960
0 04 XL1200C Signed???
Last Post: WarlordATF
Posted On: 15 Hours Ago
Replies: 12
Views: 968
0 A Reliable Engine
Last Post: Tomcatt
Posted On: 15 Hours Ago
Replies: 39
Views: 2,043
0 Before and After pictures/Videos of your bike (All Welcome)
Last Post: Haegar
Posted On: 15 Hours Ago
Replies: 109
Views: 32,316
0 Motor mount bracket hole
Last Post: Tomcatt
Posted On: 16 Hours Ago
Replies: 4
Views: 204
0 Roler Rockers - Adjustable or Fixed Push Rods
Last Post: Tomcatt
Posted On: 16 Hours Ago
Replies: 18
Views: 583
0 Do you have the service manual?
Last Post: Maxwell#256
Posted On: 16 Hours Ago
Replies: 778
Views: 254,599
0 video & pics
Last Post: cal43
Posted On: 17 Hours Ago
Replies: 760
Views: 81,628
More...
Members Birthdays
Reply
 
Share Thread Tools Display Modes
  #11  
Old 1 Week Ago
Tippy_Toes's Avatar
Tippy_Toes Tippy_Toes is offline
Professional 1-Upper
 
Join Date: Sep 2021
Location: My Home
Posts: 31
Sportster/Buell Model: Sportster 883
Sportster/Buell Year: 1986
Other Motorcycle Model: Harley FXDLS
Other Motorcycle Year: 2016
Reputation: 10
Tippy_Toes is an unknown quantity at this point
Default

Quote:
Originally Posted by Steve9 View Post
People bring up valid points

I'm not any kind of engine builder, but it sounds like a fine undertaking with many things to overcome.

And your reasons are your own....I hope you do it and post along the way it will be interesting as hell!
Yeh child psychology works well on me
I'm pretty fond of doing things that no one else wants to do. Lol.
__________________
South Texas
1986 Sportster "883" Track Bike
1986 Sportster XL1100 Backup Track Bike

I ride Harleys ironically.
Reply With Quote
  #12  
Old 1 Week Ago
Tomcatt Tomcatt is offline
Dazed & Confused
 
Join Date: Feb 2019
Location: Never Never Land
Posts: 2,613
Sportster/Buell Model: XL1200C
Sportster/Buell Year: 2017
Other Motorcycle Model: BMW R9T
Other Motorcycle Year: 2015
Reputation: 3304437
Tomcatt has a reputation beyond reputeTomcatt has a reputation beyond reputeTomcatt has a reputation beyond reputeTomcatt has a reputation beyond reputeTomcatt has a reputation beyond reputeTomcatt has a reputation beyond reputeTomcatt has a reputation beyond reputeTomcatt has a reputation beyond reputeTomcatt has a reputation beyond reputeTomcatt has a reputation beyond reputeTomcatt has a reputation beyond repute
Default

Quote:
Originally Posted by Tippy_Toes View Post
it would be an over-square 883 for sure.
I would have to destroke a larger bore, not a standard 883 bore.
I think the Buell 900 was the 1200's 3.5" bore with a 2.8"ish stroke. 900cc with room for big valves... I don't know what length rods they used.
__________________
2017 XL1200C in SE Wisconsin, USA

Last edited by Tomcatt; 1 Week Ago at 22:25..
Reply With Quote
  #13  
Old 1 Week Ago
aswracing's Avatar
aswracing aswracing is offline
A Million Facts & Figures
 
Join Date: Jan 2005
Location: Famous Potatoes
Posts: 10,359
Sportster/Buell Model: XL883
Sportster/Buell Year: 2007
Sportster/Buell Model #2: Buell Cyclone
Sportster/Buell Year #2: 1999
Reputation: 3676450
aswracing has a reputation beyond reputeaswracing has a reputation beyond reputeaswracing has a reputation beyond reputeaswracing has a reputation beyond reputeaswracing has a reputation beyond reputeaswracing has a reputation beyond reputeaswracing has a reputation beyond reputeaswracing has a reputation beyond reputeaswracing has a reputation beyond reputeaswracing has a reputation beyond reputeaswracing has a reputation beyond repute
Default

Quote:
Originally Posted by Tomcatt View Post
I think the Buell 900 was the 1200's 3.5" bore with a 2.8"ish stroke. 900cc with room for big valves... I don't know what length rods they used.
3-1/2" bore, 3-1/8" stroke, 7.270 rod ... the combination of which delivers the same deck height as the 3-13/16 stroke motors, with the same 1.200 compression height. Heads and cams identical to the XB12, which came out a year later.

Factory rev limit was 7500rpm.

I dyno'ed bunches of them back in the day. Here's a pretty typical result from a stock one:

__________________
Click Here to Contact Me

Reply With Quote
  #14  
Old 1 Week Ago
Tomcatt Tomcatt is offline
Dazed & Confused
 
Join Date: Feb 2019
Location: Never Never Land
Posts: 2,613
Sportster/Buell Model: XL1200C
Sportster/Buell Year: 2017
Other Motorcycle Model: BMW R9T
Other Motorcycle Year: 2015
Reputation: 3304437
Tomcatt has a reputation beyond reputeTomcatt has a reputation beyond reputeTomcatt has a reputation beyond reputeTomcatt has a reputation beyond reputeTomcatt has a reputation beyond reputeTomcatt has a reputation beyond reputeTomcatt has a reputation beyond reputeTomcatt has a reputation beyond reputeTomcatt has a reputation beyond reputeTomcatt has a reputation beyond reputeTomcatt has a reputation beyond repute
Default

Quote:
Originally Posted by aswracing View Post
3-1/2" bore, 3-1/8" stroke, 7.270 rod ... the combination of which delivers the same deck height as the 3-13/16 stroke motors, with the same 1.200 compression height. Heads and cams identical to the XB12, which came out a year later.

Factory rev limit was 7500rpm.
Thx, I wasn't sure. 4,500 ft/min MPS would be just under 8,700 rpm. 63.6 cu in with the 1275 kit bore. Will the valve gear live at a 9,000 rpm rev limit? Could fit what Tippy_Toes wants...
Reply With Quote
  #15  
Old 1 Week Ago
aswracing's Avatar
aswracing aswracing is offline
A Million Facts & Figures
 
Join Date: Jan 2005
Location: Famous Potatoes
Posts: 10,359
Sportster/Buell Model: XL883
Sportster/Buell Year: 2007
Sportster/Buell Model #2: Buell Cyclone
Sportster/Buell Year #2: 1999
Reputation: 3676450
aswracing has a reputation beyond reputeaswracing has a reputation beyond reputeaswracing has a reputation beyond reputeaswracing has a reputation beyond reputeaswracing has a reputation beyond reputeaswracing has a reputation beyond reputeaswracing has a reputation beyond reputeaswracing has a reputation beyond reputeaswracing has a reputation beyond reputeaswracing has a reputation beyond reputeaswracing has a reputation beyond repute
Default

The valve train could be made to twist that high, but not in stock form.

The XBRR turns 9K, but it has Ti valves and about 270lbs of seat pressure, among other things.

The XB9 crank isn't a bolt-on for a 4-speed case at all. It's not even a bolt-in for the 1991-2003 generation, although we've developed the parts and services to do it. We recently did one for a Bonneville racer who wants to run the 1000cc class with a Sportster.

What's more, the crank is discontinued and unobtanium.

So he'd be looking at a custom crank, if he wants to do this in 4-speed cases. S&S could probably make one. Pretty sure it'd have to be a pressed pin, though. There's not enough room for crankpin nuts with that short of a stroke.
Reply With Quote
  #16  
Old 1 Week Ago
Tomcatt Tomcatt is offline
Dazed & Confused
 
Join Date: Feb 2019
Location: Never Never Land
Posts: 2,613
Sportster/Buell Model: XL1200C
Sportster/Buell Year: 2017
Other Motorcycle Model: BMW R9T
Other Motorcycle Year: 2015
Reputation: 3304437
Tomcatt has a reputation beyond reputeTomcatt has a reputation beyond reputeTomcatt has a reputation beyond reputeTomcatt has a reputation beyond reputeTomcatt has a reputation beyond reputeTomcatt has a reputation beyond reputeTomcatt has a reputation beyond reputeTomcatt has a reputation beyond reputeTomcatt has a reputation beyond reputeTomcatt has a reputation beyond reputeTomcatt has a reputation beyond repute
Default

Quote:
Originally Posted by aswracing View Post
The XBRR turns 9K, but it has Ti valves and about 270lbs of seat pressure, among other things.

What's more, the crank is discontinued and unobtanium.

So he'd be looking at a custom crank, if he wants to do this in 4-speed cases. S&S could probably make one. Pretty sure it'd have to be a pressed pin, though. There's not enough room for crankpin nuts with that short of a stroke.
For some reason I was thinking he had an '04 - '06 bike... 1100 parts and a newer bike he wanted to use them on to downsize it... Lotsa reasons this isn't really feasible.
Reply With Quote
  #17  
Old 1 Week Ago
Maxeffort's Avatar
Maxeffort Maxeffort is offline
Momentary Specialist
 
Join Date: Aug 2016
Posts: 1,187
Sportster/Buell Model: XL1200
Sportster/Buell Year: 1996
Other Motorcycle Model: FLHRI
Other Motorcycle Year: 2005
Reputation: 1835043
Maxeffort has a reputation beyond reputeMaxeffort has a reputation beyond reputeMaxeffort has a reputation beyond reputeMaxeffort has a reputation beyond reputeMaxeffort has a reputation beyond reputeMaxeffort has a reputation beyond reputeMaxeffort has a reputation beyond reputeMaxeffort has a reputation beyond reputeMaxeffort has a reputation beyond reputeMaxeffort has a reputation beyond reputeMaxeffort has a reputation beyond repute
Default

Quote:
Originally Posted by Tippy_Toes View Post
Valve train isn't my big worry about doing a high rpm build, there are plenty of non-harley valve train components that are up to the task. My biggest would be the stress on the cam bearings and the case.

Bottom end would consist of destroking the crank and having the assembly built as light as possible and balanced at an unusually high rpm (maybe around 7k rpm?) to keep it together in the operating range.
The crank wouldn't necessarily need to be as robust as a low rpm motor since torque numbers would be relatively low.
The first plan of 1100 is better.
Very high compression is overrated, especially if it requires a big dome in the chamber.
All the power is in the heads, get the best ports put in that you can. You only need enough compression to support decent duration cams and then match the intake and exhaust.
If you can get a modest dome and machined squish band in the heads, that is proven the best.
All of that will get what you want.
__________________
“Smooth roads, Blue skies and Green lights”
Reply With Quote
  #18  
Old 1 Week Ago
Tippy_Toes's Avatar
Tippy_Toes Tippy_Toes is offline
Professional 1-Upper
 
Join Date: Sep 2021
Location: My Home
Posts: 31
Sportster/Buell Model: Sportster 883
Sportster/Buell Year: 1986
Other Motorcycle Model: Harley FXDLS
Other Motorcycle Year: 2016
Reputation: 10
Tippy_Toes is an unknown quantity at this point
Default

Quote:
Originally Posted by Maxeffort View Post
The first plan of 1100 is better.
Very high compression is overrated, especially if it requires a big dome in the chamber.
All the power is in the heads, get the best ports put in that you can. You only need enough compression to support decent duration cams and then match the intake and exhaust.
If you can get a modest dome and machined squish band in the heads, that is proven the best.
All of that will get what you want.
I could likely have the heads milled down for a compression bump and have the bowl reworked and squish band machined. That MAY be the best option depending on valve to piston clearance.

That's definitely the most feasible option and probably the path this motor will go down. I already have notoriously good heads, I just want to do something out of the box with an 1100. It's such a bastard motor that it would be really fun to take some wins with.

I like to throw out a WILD idea every once in a while and see where reality actually takes over. Clearly this is a K.I.S.S. moment where sticking to the road more traveled is better.
Reply With Quote
  #19  
Old 1 Week Ago
rokytnji's Avatar
rokytnji rokytnji is offline
XL FORUM LIFE MEMBER
 
Join Date: Apr 2016
Location: Texas/Mexican Border
Posts: 3,474
Sportster/Buell Model: xls 1000
Sportster/Buell Year: 1980
Sportster/Buell Model #2: xls 1000
Sportster/Buell Year #2: 1983
Other Motorcycle Model: 1200 Chopper XL
Other Motorcycle Year: 1990
Reputation: 6383137
rokytnji has a reputation beyond reputerokytnji has a reputation beyond reputerokytnji has a reputation beyond reputerokytnji has a reputation beyond reputerokytnji has a reputation beyond reputerokytnji has a reputation beyond reputerokytnji has a reputation beyond reputerokytnji has a reputation beyond reputerokytnji has a reputation beyond reputerokytnji has a reputation beyond reputerokytnji has a reputation beyond repute
Default

Quote:
I like to throw out a WILD idea every once in a while and see where reality actually takes over. Clearly this is a K.I.S.S. moment where sticking to the road more traveled is better. build a sort of "FU 1100"


I guess nitrous or turbo is out of the question on a decent engine build to handle the stress.
__________________
*Reference the Sportsterpedia! For Helpful info on your scooter.

I'm not outa place. I'm from outer space.

Traveled to
Reply With Quote
Reply

Bookmarks


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
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 Off

Forum Jump



All times are GMT +1. The time now is 09:38.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2022, vBulletin Solutions Inc.
XL Forum® - Linson Media LLC