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 C.O.B.B run west
Last Post: decman
Posted On: 1 Minute Ago
Replies: 210
Views: 15,641
0 Big bore stroker - the beginning of a 10-year long build
Last Post: RKN
Posted On: 9 Minutes Ago
Replies: 727
Views: 64,318
0 Show your favorite pic of your bike. just one
Last Post: Yakcm2
Posted On: 57 Minutes Ago
Replies: 4,686
Views: 1,735,645
0 Greetings from Mobile, Alabama
Last Post: jharback
Posted On: 1 Hour Ago
Replies: 12
Views: 169
0 New Member
Last Post: juzyHD
Posted On: 1 Hour Ago
Replies: 11
Views: 123
0 Sportster Harley Saddlebags
Last Post: Jcolleyoh
Posted On: 1 Hour Ago
Replies: 1
Views: 97
0 Big Bore Kit - What else is needed
Last Post: Cropduster
Posted On: 2 Hours Ago
Replies: 20
Views: 640
0 Boardtracker Project
Last Post: JonesL
Posted On: 2 Hours Ago
Replies: 540
Views: 96,447
0 remap. Y/N?
Last Post: Nibelungen
Posted On: 2 Hours Ago
Replies: 21
Views: 6,246
0 I finally learned how to work the system!
Last Post: brianbbs67
Posted On: 3 Hours Ago
Replies: 6
Views: 151
0 Spark Plugs
Last Post: brianbbs67
Posted On: 3 Hours Ago
Replies: 11
Views: 417
0 new (to me) '82 25th Anniversary Edition XLH 1000
Last Post: brianbbs67
Posted On: 3 Hours Ago
Replies: 41
Views: 1,251
0 Anyone go racing last weekend?
Last Post: madnss
Posted On: 3 Hours Ago
Replies: 2,713
Views: 245,752
0 Lets see your off season builds
Last Post: madnss
Posted On: 3 Hours Ago
Replies: 1,091
Views: 114,049
0 Exhaust Wrap Questions
Last Post: brianbbs67
Posted On: 3 Hours Ago
Replies: 6
Views: 91
0 Handlebars: stock Iron/48 vs Chumps
Last Post: Freud
Posted On: 3 Hours Ago
Replies: 3
Views: 560
0 Sportster fenders and fuel tank
Last Post: sportsterpaul
Posted On: 3 Hours Ago
Replies: 6
Views: 243
0 Divorced Ironhead project.
Last Post: brianbbs67
Posted On: 4 Hours Ago
Replies: 22
Views: 2,865
0 Sizing cylinders too pistons
Last Post: Yakcm2
Posted On: 4 Hours Ago
Replies: 9
Views: 273
0 You asked for it! "The Tess' Coffee Thread"
Last Post: sportsterpaul
Posted On: 4 Hours Ago
Replies: 10,242
Views: 670,109
0 Crusty's Travels
Last Post: sportsterpaul
Posted On: 4 Hours Ago
Replies: 1,510
Views: 152,409
0 Tail Light Dying While Riding
Last Post: tigger
Posted On: 5 Hours Ago
Replies: 2
Views: 42
0 Cafe' Image thread WTFN
Last Post: tigger
Posted On: 5 Hours Ago
Replies: 5,079
Views: 2,194,627
0 How many miles do you have on your rubbermount?
Last Post: ParrotHead
Posted On: 5 Hours Ago
Replies: 384
Views: 70,629
0 Range With Carby 3.3 Gal Tank
Last Post: Terrier
Posted On: 5 Hours Ago
Replies: 74
Views: 30,882
0 ....1
Last Post: hammer6315
Posted On: 6 Hours Ago
Replies: 4,563
Views: 211,695
0 1998 Sportster Ignition Problems
Last Post: IXL2Relax
Posted On: 6 Hours Ago
Replies: 19
Views: 593
0 Battery draining problem when running, but generator and regulator work?
Last Post: IXL2Relax
Posted On: 7 Hours Ago
Replies: 44
Views: 2,242
0 My Second Sporty A 2012 Forty-Eight
Last Post: Caustic Dick
Posted On: 7 Hours Ago
Replies: 17
Views: 11,353
0 Broken exhaust stud questions.
Last Post: Jollly Rogers
Posted On: 7 Hours Ago
Replies: 6
Views: 145
More...
Members Birthdays
epconde (61), floydfan222 (58), Brian (53), Rondall (53), Nightster Man, Scarecrow2311 (49), thatbikerguy (49), SprtyGirl (47), freecdp45 (47), rxr, addy76 (42), sportster883r (38), Steeljester (37), 98xl1200s (32)
Sponsored Links
Reply
 
Share Thread Tools Display Modes
  #1  
Old 4 Weeks Ago
Ridneck1986's Avatar
Ridneck1986 Ridneck1986 is offline
Biker
 
Join Date: Jul 2018
Location: Mechanicsville
Posts: 14
Sportster/Buell Model: 883l/1200
Sportster/Buell Year: 05
Reputation: 10
Ridneck1986 is an unknown quantity at this point
Default 11:1 883-1200 build

I figured I would start off on this forum with a build I am just starting on. So here is a parts list of what i have gathered so far.

s&s adj pushrods with tubes
TC88A
KB 11:1 883-1200 flat top pistons +1cc
kibblewhite intake and exhaust valve conversion
kibblewhite .610 spring kit
SE High cap tappets
SE 1.725 rockers
All the gaskets
SE head studs
SE.551 cams

I have a good friend that owns a shop helping me out with the build. The stock cylinders will be bored to just 3.5 and going to clean and do a little head work and install compression releases. Just seeing what I can do with what I got. i will update my progress here as I go with ups and downs. More ups then downs I hope. lol. The cylinders and heads will get started tomorrow. Feel free to ask any questions you want
__________________
05 883l-1200
Reply With Quote
  #2  
Old 4 Weeks Ago
ReddTigger's Avatar
ReddTigger ReddTigger is offline
XL FORUM LIFE MEMBER
 
Join Date: Aug 2005
Location: MARY Lund, YUK !
Posts: 15,323
Sportster/Buell Model: XLH-1208
Sportster/Buell Year: 1997
Reputation: 2027967
ReddTigger has a reputation beyond reputeReddTigger has a reputation beyond reputeReddTigger has a reputation beyond reputeReddTigger has a reputation beyond reputeReddTigger has a reputation beyond reputeReddTigger has a reputation beyond reputeReddTigger has a reputation beyond reputeReddTigger has a reputation beyond reputeReddTigger has a reputation beyond reputeReddTigger has a reputation beyond reputeReddTigger has a reputation beyond repute
Default

Quote:
Originally Posted by Ridneck1986 View Post
I figured I would start off on this forum with a build I am just starting on. So here is a parts list of what i have gathered so far.

s&s adj pushrods with tubes
TC88A
KB 11:1 883-1200 flat top pistons +1cc
kibblewhite intake and exhaust valve conversion
kibblewhite .610 spring kit
SE High cap tappets
SE 1.725 rockers
All the gaskets
SE head studs
SE.551 cams

I have a good friend that owns a shop helping me out with the build. The stock cylinders will be bored to just 3.5 and going to clean and do a little head work and install compression releases. Just seeing what I can do with what I got. i will update my progress here as I go with ups and downs. More ups then downs I hope. lol. The cylinders and heads will get started tomorrow. Feel free to ask any questions you want



If those pistons are the Keith Black hypereuretic pistons, you may want to reconsider them. They retain heat very poorly and can cause air cooled motorcycles to go boom. especially if you get any knock.
__________________


States I've Ridden in

71.3 hp 70.8 tq

1208cc 11.09:1 (Wiseco 10° Dome 10.5:1 .010 over) ,Screamin Eagle Dual Plug Heads (10° 61cc), Original SE A/C, Vance & Hines Straight Shots w/ Custom Baffles. SE 6800 ign, Dual BREMBO brakes/ Pirelli Night Dragon MU85-16 Rear - 100/90-19 Front. Progressive Springs & 412 HD 13½" Chrome Shocks, 5½" pullback riser w/ "reddtigger mount", Stebel Nautilus Compact Air horn, Mustang Vintage Super Wide Touring Seat, Alto Carbonite Clutch
Reply With Quote
  #3  
Old 4 Weeks Ago
rocketmangb's Avatar
rocketmangb rocketmangb is offline
XL FORUM TEAM MEMBER
 
Join Date: Jan 2008
Location: So Cal
Posts: 20,417
Sportster/Buell Model: XL1200C
Sportster/Buell Year: 2006
Sportster/Buell Model #2: XL1200C
Sportster/Buell Year #2: 2006
Other Motorcycle Model: 48 "Totalled" By a Douche
Other Motorcycle Year: 2012
Reputation: 2679679
rocketmangb has a reputation beyond reputerocketmangb has a reputation beyond reputerocketmangb has a reputation beyond reputerocketmangb has a reputation beyond reputerocketmangb has a reputation beyond reputerocketmangb has a reputation beyond reputerocketmangb has a reputation beyond reputerocketmangb has a reputation beyond reputerocketmangb has a reputation beyond reputerocketmangb has a reputation beyond reputerocketmangb has a reputation beyond repute
Default

I like the TC88A
The other choices not so much.
__________________
Thy Sportster Come
It Shall Be Done
On Earth as it is on Salt
2006 Sportster XL1250C
Hammer Sledge Heads 1.98X1.61 Valves
Hammer 600 Cams
Big Ass CP/Hammer Pistons
Mikuni HSR 45 /Hammer Billet Manifold (Now HSR 48)
Jetted 27.5 slow,182.5 Main
97 Needle,Clip posistion 3
Hurricane Flow 3" offset AC,Rocketman Mod
Daytona Twin Tec TC88A,Rico Scarecrow Map
Sumax Thundervolt plug wires,NGK DCPR8EIX spark plugs. Gapped .040 and Indexed
Cycle Electric Stator and Regulator
Alto Carbonite Clutch
Royal Purple 20W50 MC Primary oil
Patriot Defender Pipe
Royal Purple 20W50 MC Engine Oil
Napa 7148 oil filter
Max Power, 111.47
Max Torque, 84.39
Best 1/4 Mile ET to date 11.85
Best 1/4 Speed to date 115.14
Build by Jester Motorwerkz West
Reply With Quote
  #4  
Old 4 Weeks Ago
Ridneck1986's Avatar
Ridneck1986 Ridneck1986 is offline
Biker
 
Join Date: Jul 2018
Location: Mechanicsville
Posts: 14
Sportster/Buell Model: 883l/1200
Sportster/Buell Year: 05
Reputation: 10
Ridneck1986 is an unknown quantity at this point
Default

Quote:
Originally Posted by ReddTigger View Post
If those pistons are the Keith Black hypereuretic pistons, you may want to reconsider them. They retain heat very poorly and can cause air cooled motorcycles to go boom. especially if you get any knock.
They are supposed to be forged.
Reply With Quote
  #5  
Old 4 Weeks Ago
Ridneck1986's Avatar
Ridneck1986 Ridneck1986 is offline
Biker
 
Join Date: Jul 2018
Location: Mechanicsville
Posts: 14
Sportster/Buell Model: 883l/1200
Sportster/Buell Year: 05
Reputation: 10
Ridneck1986 is an unknown quantity at this point
Default

Quote:
Originally Posted by rocketmangb View Post
I like the TC88A
The other choices not so much.
This is like a first crack at it. Trying to be a little different then everyone else. I have a road king as well. This is gonna be a play bike how ever it turns out. Haha. I chose the tc88a because of reading post of your map in and other members as well.
Reply With Quote
  #6  
Old 4 Weeks Ago
rocketmangb's Avatar
rocketmangb rocketmangb is offline
XL FORUM TEAM MEMBER
 
Join Date: Jan 2008
Location: So Cal
Posts: 20,417
Sportster/Buell Model: XL1200C
Sportster/Buell Year: 2006
Sportster/Buell Model #2: XL1200C
Sportster/Buell Year #2: 2006
Other Motorcycle Model: 48 "Totalled" By a Douche
Other Motorcycle Year: 2012
Reputation: 2679679
rocketmangb has a reputation beyond reputerocketmangb has a reputation beyond reputerocketmangb has a reputation beyond reputerocketmangb has a reputation beyond reputerocketmangb has a reputation beyond reputerocketmangb has a reputation beyond reputerocketmangb has a reputation beyond reputerocketmangb has a reputation beyond reputerocketmangb has a reputation beyond reputerocketmangb has a reputation beyond reputerocketmangb has a reputation beyond repute
Default

So you gonna run the 883 heads over a flat top ?
551 cams with high lift rockers ?
So what about Valve to Valve clearance ?
Not sure about those KB pistons being forged
Reply With Quote
  #7  
Old 4 Weeks Ago
MatHormell's Avatar
MatHormell MatHormell is offline
Senior Chief Master Mechanic 1st Class
 
Join Date: Jul 2015
Location: Merica!Fock YA!
Posts: 1,221
Sportster/Buell Model: XL883R
Sportster/Buell Year: 2002
Sportster/Buell Model #2: Buell XB12R
Sportster/Buell Year #2: 2009
Other Motorcycle Model: Yamaha
Other Motorcycle Year: 95
Reputation: 958932
MatHormell has a reputation beyond reputeMatHormell has a reputation beyond reputeMatHormell has a reputation beyond reputeMatHormell has a reputation beyond reputeMatHormell has a reputation beyond reputeMatHormell has a reputation beyond reputeMatHormell has a reputation beyond reputeMatHormell has a reputation beyond reputeMatHormell has a reputation beyond reputeMatHormell has a reputation beyond reputeMatHormell has a reputation beyond repute
Default

Quote:
Originally Posted by rocketmangb View Post
So you gonna run the 883 heads over a flat top ?
551 cams with high lift rockers ?
So what about Valve to Valve clearance ?
Not sure about those KB pistons being forged
this was my first concern reading this as well, if there is even enough clearance to run high rations on a 883 head with flat tops..
__________________
HAMMER PERFORMANCE 90 Ci
CP .500 Dome Pistons
Axtel Cast Iron Cylinders
HAMMER PERFORMANCE .600 Cams
1.725 Ratio S&S Rocker Arms
HAMMER PERFORMANCE Intake Manifold
HSR 48 Miunki
XR1200 Crank Conversion W/ Case Mod 34T
HAMMER PERFORMANCE Sledge+ Head Work
2.020" Intake and 1.630" Exhaust Valves
Conical Valve Springs
S&S Premium Lifters
HAMMER PERFORMANCE Billet Push Rod Bases
Barnett Clutch Hub With Scorpion Clutch
Dynatek 2000i
R&D MOTORSPORTS- TRANSMISSION WORK-REM ISF
WorldWideBearings
Patriot Defender Exhaust
Reply With Quote
  #8  
Old 4 Weeks Ago
aswracing's Avatar
aswracing aswracing is offline
A Million Facts & Figures
 
Join Date: Jan 2005
Location: Famous Potatoes
Posts: 9,851
Sportster/Buell Model: XL883
Sportster/Buell Year: 2007
Sportster/Buell Model #2: Buell Cyclone
Sportster/Buell Year #2: 1999
Reputation: 1861843
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

TDC's on those cams are .197/.122 @1.65 ratio. They're on the mild end of the overlap spectrum at only 35 degrees.

At 1.725 ratio, that works out to .206/.127, which is still pretty low. I don't see it causing any issues with valve-to-piston, especially with an aftermarket forged piston.

Max lift would go up to .576. With 1.720/1.480 valves, you're talking an L/D ratio of .33/.39, which gives a curtain area that's well past the throat diameter. In other words, the valve has been lifted well beyond the point where it's the thing limiting the flow. At that point the flow curve noses over and flattens out, you're flowing all the air it's got for you. The 1.725's small broadening effect on the cam timing is going to be a bigger help than the additional lift, but it's tiny.

Those lifts by the way assume you get the full 4.5% theoretical gain from the rockers, which is not a foregone conclusion. The geometry has to be set up correctly to realize that gain. But presumably his head porter knows how to do that.

Anyway, I think the combination will be fine on valve-to-piston. If the decks get a bunch whacked off, then he might get into trouble. But not with moderate decking.

Valve-to-valve could be closer, but hopefully his head porter checks it.

If this was my project, my biggest concern would be the 44 degree intake close timing in combination with an 11:1 CR. That's pushing things. Hopefully he has a plan for dealing with it.

Other than that I don't see any real concerns with his plan. I think it burns some money on things that aren't going to do anything for him, but I don't see any actual problems. Hopefully he puts it on a dyno and shows us the result, I'm always up for gathering data.
__________________
Click Here to Contact Me

Reply With Quote
  #9  
Old 4 Weeks Ago
Ridneck1986's Avatar
Ridneck1986 Ridneck1986 is offline
Biker
 
Join Date: Jul 2018
Location: Mechanicsville
Posts: 14
Sportster/Buell Model: 883l/1200
Sportster/Buell Year: 05
Reputation: 10
Ridneck1986 is an unknown quantity at this point
Default

Quote:
Originally Posted by rocketmangb View Post
So you gonna run the 883 heads over a flat top ?
551 cams with high lift rockers ?
So what about Valve to Valve clearance ?
Not sure about those KB pistons being forged
Going off of the website for the pistons, they should work fine for the 883 heads with the stock ratio rockers. They for use with 883 heads or 1200 heads. I do not for see a problem with the pistons as long at the clearance is correct, which we will check before any milling of the heads so my porter knows what he is working with.

I will put up a dyno after I get my street tires back on the bike. Right now it has dirt bike tires.
Reply With Quote
Sponsored Links
  #10  
Old 4 Weeks Ago
Ridneck1986's Avatar
Ridneck1986 Ridneck1986 is offline
Biker
 
Join Date: Jul 2018
Location: Mechanicsville
Posts: 14
Sportster/Buell Model: 883l/1200
Sportster/Buell Year: 05
Reputation: 10
Ridneck1986 is an unknown quantity at this point
Default

Quote:
Originally Posted by aswracing View Post
TDC's on those cams are .197/.122 @1.65 ratio. They're on the mild end of the overlap spectrum at only 35 degrees.

At 1.725 ratio, that works out to .206/.127, which is still pretty low. I don't see it causing any issues with valve-to-piston, especially with an aftermarket forged piston.

Max lift would go up to .576. With 1.720/1.480 valves, you're talking an L/D ratio of .33/.39, which gives a curtain area that's well past the throat diameter. In other words, the valve has been lifted well beyond the point where it's the thing limiting the flow. At that point the flow curve noses over and flattens out, you're flowing all the air it's got for you. The 1.725's small broadening effect on the cam timing is going to be a bigger help than the additional lift, but it's tiny.

Those lifts by the way assume you get the full 4.5% theoretical gain from the rockers, which is not a foregone conclusion. The geometry has to be set up correctly to realize that gain. But presumably his head porter knows how to do that.

Anyway, I think the combination will be fine on valve-to-piston. If the decks get a bunch whacked off, then he might get into trouble. But not with moderate decking.

Valve-to-valve could be closer, but hopefully his head porter checks it.

If this was my project, my biggest concern would be the 44 degree intake close timing in combination with an 11:1 CR. That's pushing things. Hopefully he has a plan for dealing with it.

Other than that I don't see any real concerns with his plan. I think it burns some money on things that aren't going to do anything for him, but I don't see any actual problems. Hopefully he puts it on a dyno and shows us the result, I'm always up for gathering data.
Thanks for the explanation of the idea. not really sure what im doing but my head guy does. I will deff keep this post updated will the progress of ups and downs.

As far as some wasted money that's always my problem. Lucky for me he just has the cams on the shelf and said I could try them along with the high ratios rockers, so it a win win for me.
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



Sponsored Links
All times are GMT +1. The time now is 09:13.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2018, vBulletin Solutions Inc.
XL Forum® - Linson Media LLC