The Sportster and Buell Motorcycle Forum - The XLFORUM®
 

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

Notices

Sportster Motorcycle Engine Conversions Advice, questions, and tips for 1200, 1250, 1340, 1450 etc... for Sportster and Buell motorcycle engine conversions

Active Threads
0 Keep & Kill
Last Post: Crusty
Posted On: 26 Minutes Ago
Replies: 33,597
Views: 2,049,741
0 Roads I'd like to ride.
Last Post: Gearhead88
Posted On: 1 Hour Ago
Replies: 4,031
Views: 539,792
0 Left Sidecover Won't Fit
Last Post: Bluto
Posted On: 1 Hour Ago
Replies: 20
Views: 909
0 1974 XLH Rebuild
Last Post: Gearhead88
Posted On: 1 Hour Ago
Replies: 65
Views: 2,835
0 1977 sporty
Last Post: needspeed
Posted On: 2 Hours Ago
Replies: 10
Views: 327
0 Official XL Forum Random Image Thread (NO NUDITY!)
Last Post: Graywolf
Posted On: 3 Hours Ago
Replies: 56,870
Views: 9,886,721
0 Hottie of the day, no nudity.
Last Post: Stairman
Posted On: 3 Hours Ago
Replies: 41,711
Views: 5,817,826
4 The dreaded carb cough and interesting findings
Last Post: gearbanger
Posted On: 3 Hours Ago
Replies: 24
Views: 1,159
0 This is gonna hurt.
Last Post: Graywolf
Posted On: 4 Hours Ago
Replies: 10,177
Views: 2,571,497
0 What did you do to your EFI Sporty today?
Last Post: SaddleBronc
Posted On: 6 Hours Ago
Replies: 4,071
Views: 908,592
0 video & pics
Last Post: Crusty
Posted On: 7 Hours Ago
Replies: 2,480
Views: 276,864
0 What did you do for your sporty Today?
Last Post: Melnic
Posted On: 8 Hours Ago
Replies: 8,102
Views: 1,582,048
0 A matter of degree (Pretty Pics)
Last Post: IronheadLiam
Posted On: 9 Hours Ago
Replies: 8
Views: 1,549
5 Stock 1982 XLS Gas Tank Mounts
Last Post: IronMick
Posted On: 10 Hours Ago
Replies: 1
Views: 96
0 Vm38 o ring
Last Post: joe s
Posted On: 10 Hours Ago
Replies: 3
Views: 115
0 Brake Lever
Last Post: joe s
Posted On: 10 Hours Ago
Replies: 1
Views: 144
0 oil line routing-a thought
Last Post: Todd007
Posted On: 11 Hours Ago
Replies: 14
Views: 9,232
0 Iree's late night cafe
Last Post: ~Grind~
Posted On: 11 Hours Ago
Replies: 2,471
Views: 515,666
0 TC88A and higher compression timing
Last Post: clark_zrx
Posted On: 12 Hours Ago
Replies: 7
Views: 281
0 an interesting vintage XLCH review...
Last Post: rejeanprimeau
Posted On: 14 Hours Ago
Replies: 28
Views: 961
0 75 Ironhead cafe racer reboot
Last Post: brucstoudt
Posted On: 15 Hours Ago
Replies: 92
Views: 5,393
0 Mushrooms...Hate or Love poll
Last Post: cal43
Posted On: 15 Hours Ago
Replies: 227
Views: 18,087
0 Hot Chicks on Hot Bikes
Last Post: cal43
Posted On: 15 Hours Ago
Replies: 13,722
Views: 3,733,648
0 Hot Rods, Rat Rods, and Customs.
Last Post: cal43
Posted On: 16 Hours Ago
Replies: 5,749
Views: 1,434,233
0 Horseshoe Oil tanks repo China?
Last Post: Ferrous Head
Posted On: 21 Hours Ago
Replies: 20
Views: 2,535
0 Snippets
Last Post: sportsterpaul
Posted On: 23 Hours Ago
Replies: 887
Views: 153,419
0 1959 xlh
Last Post: thomastoth
Posted On: 1 Day Ago
Replies: 11
Views: 1,464
0 Tank Art
Last Post: joe s
Posted On: 1 Day Ago
Replies: 43
Views: 3,001
0 Lost for words.
Last Post: Ferrous Head
Posted On: 1 Day Ago
Replies: 13
Views: 921
0 DO NOT use GMAIL.COM email for XLFORUM.NET
Last Post: Ferrous Head
Posted On: 1 Day Ago
Replies: 3
Views: 345
More...
Members Birthdays
Reply
 
Share Thread Tools Display Modes
  #21  
Old 1 Week Ago
John Harper John Harper is offline
Senior Master Custom Bike Builder
 
Join Date: Apr 2012
Posts: 4,418
Sportster/Buell Model: 1250
Sportster/Buell Year: 1991
Reputation: 3375049
John Harper has a reputation beyond reputeJohn Harper has a reputation beyond reputeJohn Harper has a reputation beyond reputeJohn Harper has a reputation beyond reputeJohn Harper has a reputation beyond reputeJohn Harper has a reputation beyond reputeJohn Harper has a reputation beyond reputeJohn Harper has a reputation beyond reputeJohn Harper has a reputation beyond reputeJohn Harper has a reputation beyond reputeJohn Harper has a reputation beyond repute
Default

Quote:
Originally Posted by bweever View Post
Just wondering if there is machinist who has actually done the machining of 883 to 1200 cylinders themselves that can answer my questions. Thanks
You might contact Hammer Performance. They used to do cylinder boring, and can probably tell you all you ever thought you needed to know, and more, about the process. I don't believe they bore them anymore, but I think they offered a 1212cc bore kit.

John
Reply With Quote
  #22  
Old 1 Week Ago
aswracing's Avatar
aswracing aswracing is offline
A Million Facts & Figures
 
Join Date: Jan 2005
Location: Famous Potatoes
Posts: 10,444
Sportster/Buell Model: XL883
Sportster/Buell Year: 2007
Sportster/Buell Model #2: Buell Cyclone
Sportster/Buell Year #2: 1999
Reputation: 3880057
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 bweever View Post
I am aware of the cylinder liner thickness has changed over the years, all the cylinders that I am boring out are pre 2007, I am not interested in purchasing any 1200 cylinder kits as I have acquired several 883 cylinders that I will be boring to 1200 so I can get the exact piston to cylinder clearance that I want for the engine builds that I am doing.
The 883 cylinder skirt end has a much more pronounce chamfer which is closer to the cylinder base than a stock 1200 cylinder skirt, so when the ID of an 883 cylinder is bored out some of this chamfer is cut away due to the boring process which will cause the skirt to become shorter by about .100" so my question is how short of a cylinder skirt is still considered acceptable?
I have noticed a lot of suggestions of using torque plates while boring, I have measured both 883 & 1200 cylinders with torque plates and without torque plates and I do not see any change in dimensions.
Just wondering if there is machinist who has actually done the machining of 883 to 1200 cylinders themselves that can answer my questions. Thanks
I've personally bored several hundred of them, and the amount the spigot gets shortened in the process has never been an issue. FYI, after boring I always put the cylinder on the lathe and put a chamfer on the inside of the spigot.

If you're not seeing a difference between in and out of the torque plates, well, I can only tell you that I see the shape change to the tune of .0010-.0020. Hopefully you know this, but you need a tenth-reading bore gauge (.0001) to make these measurements accurately. Zero it with a tenth reading micrometer.

Another thing I noticed a long time ago is that I can get a cylinder straight and round top to bottom to within a tenth or two, take it out of the plates and it'll move as I described, and then put it back in the plates and measure again and it won't be exactly the same. Close, but it'll be a tenth or two bigger here and a tenth or two smaller there. Others who bore and hone cylinders have confirmed to me that they see the same thing.
__________________
Click Here to Contact Me

Reply With Quote
  #23  
Old 1 Week Ago
aswracing's Avatar
aswracing aswracing is offline
A Million Facts & Figures
 
Join Date: Jan 2005
Location: Famous Potatoes
Posts: 10,444
Sportster/Buell Model: XL883
Sportster/Buell Year: 2007
Sportster/Buell Model #2: Buell Cyclone
Sportster/Buell Year #2: 1999
Reputation: 3880057
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 John Harper View Post
You might contact Hammer Performance. They used to do cylinder boring, and can probably tell you all you ever thought you needed to know, and more, about the process. I don't believe they bore them anymore, but I think they offered a 1212cc bore kit.

John
We still bore and hone a lot of Twin Cams, but only a handful of XL cylinders.

As you may know, the two common Twin Cam bore sizes are 3.750" (used on 88 & 96ci) and 3.875" (used on 95ci & 103ci). It's real common to punch those out to 3.938 (3-15/16), which gets you to 97.4ci on the 4 inch stroke motors and 106.6ci on the 4-3/8 stroke motors. We call those 98 and 107 inch kits respectively.

3.938 is about the safe limit on the factory Twin Cam cylinder. Both S&S and HD offer a steel liner cylinder that allows a thinner spigot and a full 4" bore. Similar to our 1275 cylinder. But the introduction of those products doesn't seem to have slowed demand for boring the stock pieces. The price difference probably has something to do with that.
Reply With Quote
  #24  
Old 1 Week Ago
Iron Mike Iron Mike is offline
Master Custom Bike Builder
 
Join Date: Dec 2014
Location: Phoenix
Posts: 3,020
Sportster/Buell Model: xlch
Sportster/Buell Year: 1964
Sportster/Buell Model #2: XLCH IR EFI
Sportster/Buell Year #2: 1971
Other Motorcycle Model: BMW K1200RS
Other Motorcycle Year: 2001
Reputation: 3023427
Iron Mike has a reputation beyond reputeIron Mike has a reputation beyond reputeIron Mike has a reputation beyond reputeIron Mike has a reputation beyond reputeIron Mike has a reputation beyond reputeIron Mike has a reputation beyond reputeIron Mike has a reputation beyond reputeIron Mike has a reputation beyond reputeIron Mike has a reputation beyond reputeIron Mike has a reputation beyond reputeIron Mike has a reputation beyond repute
Default

I have bored 883-1200 before. I too have seen discrepancies with/without torque plates.
To expedite the boring process prior to the Van Norman bar, majority of material is removed in the lathe, then the remainder removed with torque plates in the bar. Then of course finish honed with plates.

Just my $.02
Reply With Quote
  #25  
Old 1 Week Ago
bweever bweever is offline
Biker
 
Join Date: Oct 2022
Posts: 3
Sportster/Buell Model: M2
Sportster/Buell Year: 2000
Reputation: 10
bweever is an unknown quantity at this point
Default

Thanks aswracing for your info regarding the spigot, I have notice the cylinder shape float around a bit by a tenth or two when taking the jug out of torque plates and putting it back in the plates just like you have described, but I have not seen the huge change of ,001 to .002 yet, but then also I am just starting these projects and discovering something different everyday.
I am retired machinist from the aerospace industry and I really don't know how to use a measuring tool if it does not have a resolution of .0001"
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 02:38.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2023, vBulletin Solutions Inc.
XL Forum® - Linson Media LLC