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 Motor - Top End
XLF Blogs XLF Arcade XLF Disclaimer/Privacy Statement/Terms Of Use

Sportster Motorcycle Motor - Top End Discuss Sportster Motorcycle Top End issues. Rockerboxes, Valves, Cylinders, Pistons, Rings, Lift Rods, etc...

Active Threads
0 Need help with S&S GB carb
Last Post: Nitro57xl
Posted On: 1 Minute Ago
Replies: 24
Views: 531
0 Have my cake and eat it too? 1275 + 570s + CVJ
Last Post: seajay
Posted On: 5 Minutes Ago
Replies: 25
Views: 465
0 You asked for it! "The Tess' Coffee Thread"
Last Post: sportsterpaul
Posted On: 8 Minutes Ago
Replies: 10,879
Views: 893,384
0 Lake Ozark Bikefest
Last Post: sportsterpaul
Posted On: 10 Minutes Ago
Replies: 28
Views: 617
5 What Color Helmet is Most Noticable?
Last Post: NLXL
Posted On: 10 Minutes Ago
Replies: 44
Views: 8,156
0 Official XL Forum Random Image Thread (NO NUDITY!)
Last Post: Stairman
Posted On: 15 Minutes Ago
Replies: 44,938
Views: 7,078,769
0 Seeley Ironhead race bike
Last Post: ex119x
Posted On: 16 Minutes Ago
Replies: 16
Views: 809
0 Vote for Most Sought After Sportster
Last Post: rocketnorton
Posted On: 40 Minutes Ago
Replies: 328
Views: 72,851
0 Hot Chicks on Hot Bikes
Last Post: trainman
Posted On: 41 Minutes Ago
Replies: 10,251
Views: 1,753,538
0 Do Loud Pipes in fact save lives?
Last Post: boomerguy
Posted On: 53 Minutes Ago
Replies: 2,552
Views: 270,288
0 ultima iggy plate near the end of travel
Last Post: Nitro57xl
Posted On: 1 Hour Ago
Replies: 1
Views: 56
0 Lets See your bike on a scenic overlook
Last Post: harley506d
Posted On: 2 Hours Ago
Replies: 134
Views: 23,609
0 Best seat for long rides
Last Post: scram98400jm
Posted On: 2 Hours Ago
Replies: 120
Views: 26,728
0 What kind of saddle do you use on your sporty?
Last Post: Tomcatt
Posted On: 2 Hours Ago
Replies: 284
Views: 79,624
0 How many helmets?
Last Post: Bama Lee XLC
Posted On: 2 Hours Ago
Replies: 207
Views: 40,339
0 My 1250 to 1275 build
Last Post: Bryan1976
Posted On: 2 Hours Ago
Replies: 133
Views: 7,488
0 ....1
Last Post: Graywolf
Posted On: 2 Hours Ago
Replies: 4,975
Views: 293,130
0 Hottie of the day, no nudity.
Last Post: Stairman
Posted On: 3 Hours Ago
Replies: 13,734
Views: 1,265,213
0 My 1988 basket case has a belt? Should I keep it?
Last Post: rokytnji
Posted On: 3 Hours Ago
Replies: 6
Views: 103
0 Riding jackets
Last Post: rokytnji
Posted On: 3 Hours Ago
Replies: 27
Views: 3,285
0 Bar vibration
Last Post: harley506d
Posted On: 3 Hours Ago
Replies: 0
Views: 34
0 New rider, first ride
Last Post: Stairman
Posted On: 3 Hours Ago
Replies: 13
Views: 186
0 What did you do for your sporty Today?
Last Post: Highly-Dangerous
Posted On: 4 Hours Ago
Replies: 6,343
Views: 813,248
0 Tour of Honor
Last Post: ParrotHead
Posted On: 5 Hours Ago
Replies: 7
Views: 327
0 Lifting a low
Last Post: 51 New West
Posted On: 5 Hours Ago
Replies: 13
Views: 812
0 How many Sporty seats ya got for one ass?
Last Post: 51 New West
Posted On: 5 Hours Ago
Replies: 262
Views: 55,494
0 Further forward mids on pre-2014 models
Last Post: 51 New West
Posted On: 5 Hours Ago
Replies: 3
Views: 136
0 70 XLCH Piston, Connecting rod issue
Last Post: GA_Ironhead
Posted On: 6 Hours Ago
Replies: 60
Views: 2,478
0 Controls replacement switches?
Last Post: ReddTigger
Posted On: 6 Hours Ago
Replies: 1
Views: 36
More...
Members Birthdays
Zanzibar, stvmike (65), Leroywulf (61), Erik (58), SoCal Harley (53), drew96 (41), Reverend_d (39)
Sponsored Links
Reply
 
Share Thread Tools Display Modes
  #21  
Old 3 Weeks Ago
Maxeffort Maxeffort is online now
Momentary Specialist
 
Join Date: Aug 2016
Posts: 309
Sportster/Buell Model: 1200C
Sportster/Buell Year: 96
Other Motorcycle Model: ST1100
Other Motorcycle Year: 99
Reputation: 409898
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 bustert View Post
how about smaller valves and 4 of them?
old tech these days and the sportie is left behind
it would really be simple with a waukesha type valve bridge.
Good for low RPM Diesel engines, many of them are set up like that. Not so good for a higher RPM engine and it adds height to the valve train.

A rocker arm with two levers is the popular solution, as has the Milwaukee Eight.

And yes, the four valve pent-roof chamber head is superior to a two valve head. M8 has that as well.
__________________
Sleepy Labeef rides again!
Reply With Quote
  #22  
Old 3 Weeks Ago
Toejam503's Avatar
Toejam503 Toejam503 is offline
Air-Cooled Forever
 
Join Date: May 2010
Location: Dakota Territory
Posts: 2,615
Sportster/Buell Model: XL 1200 C
Sportster/Buell Year: 2006
Sportster/Buell Model #2: (Prev.Own)XLH Milw.Spec.
Sportster/Buell Year #2: 1981
Reputation: 4838891
Toejam503 has a reputation beyond reputeToejam503 has a reputation beyond reputeToejam503 has a reputation beyond reputeToejam503 has a reputation beyond reputeToejam503 has a reputation beyond reputeToejam503 has a reputation beyond reputeToejam503 has a reputation beyond reputeToejam503 has a reputation beyond reputeToejam503 has a reputation beyond reputeToejam503 has a reputation beyond reputeToejam503 has a reputation beyond repute
Default

Comparing a Suzuki 800cc w/4 valves per cyl. @ 50HP and a Sportster 883cc w/2 valves per cyl. @ 48HP, putting larger valves in would only work to a point where as going with 4 valves per cyl. would definitely increase airflow. (IMO..Also improves emissions)
Reply With Quote
  #23  
Old 3 Weeks Ago
60Gunner's Avatar
60Gunner 60Gunner is offline
Chief of Security
 
Join Date: Sep 2017
Location: United States
Posts: 1,918
Sportster/Buell Model: 1200/1250C
Sportster/Buell Year: 05
Reputation: 2195891
60Gunner has a reputation beyond repute60Gunner has a reputation beyond repute60Gunner has a reputation beyond repute60Gunner has a reputation beyond repute60Gunner has a reputation beyond repute60Gunner has a reputation beyond repute60Gunner has a reputation beyond repute60Gunner has a reputation beyond repute60Gunner has a reputation beyond repute60Gunner has a reputation beyond repute60Gunner has a reputation beyond repute
Default

Quote:
Originally Posted by Toejam503 View Post
Comparing a Suzuki 800cc w/4 valves per cyl. @ 50HP and a Sportster 883cc w/2 valves per cyl. @ 48HP, putting larger valves in would only work to a point where as going with 4 valves per cyl. would definitely increase airflow. (IMO..Also improves emissions)
There's that naughty e word again. The more it xxxxed up the diesel world the more determined I was to bellow as much black smoke as I could. Gained a shit ton of hp in the process with nothing but tweaking the ECM by writing fuel into the file and big ass straight pipes.
Went from 575 to 650+ with my 6nz. Still the most sought after motor today in big trucks and the last year it was made was 03. It's put in glider kits. Brand new trucks minus the drivetrain.
Cat quit making motors altogether for trucks I think in 08. Emissions killed them. Buried them in warranty work. They won't stop til they kill these too.

They're trying to outlaw gliders.
__________________
05 1200/1250C/Hammer 570 Cams/E1 clutch kit
TC88A Gunner's V00D00 map/DCPR7E/Taylor Pro 8mm
S&S Premium Lifters/KhromeWerks HP Plus 3" slip ons
HSR42 25 pilot 2 turns Y6 needle jet 97 needle 3rd groove 170 main
Dragtron II AC K&N filter/VR1 20W50/Spectro 85wt Primary Oil

Reply With Quote
  #24  
Old 3 Weeks Ago
bustert's Avatar
bustert bustert is offline
XL FORUM TEAM MEMBER
 
Join Date: Jul 2008
Posts: 9,525
Sportster/Buell Model: 1200s
Sportster/Buell Year: 2001
Sportster/Buell Model #2: xlch
Sportster/Buell Year #2: 1974
Reputation: 2711104
bustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond repute
Default

4 valve engines laugh at rpm
the last few auto i had were 4 valve and redlined near 7k, one i have now is turbo and only 1500cc and scats like a mad cat!
Reply With Quote
  #25  
Old 3 Weeks Ago
Toejam503's Avatar
Toejam503 Toejam503 is offline
Air-Cooled Forever
 
Join Date: May 2010
Location: Dakota Territory
Posts: 2,615
Sportster/Buell Model: XL 1200 C
Sportster/Buell Year: 2006
Sportster/Buell Model #2: (Prev.Own)XLH Milw.Spec.
Sportster/Buell Year #2: 1981
Reputation: 4838891
Toejam503 has a reputation beyond reputeToejam503 has a reputation beyond reputeToejam503 has a reputation beyond reputeToejam503 has a reputation beyond reputeToejam503 has a reputation beyond reputeToejam503 has a reputation beyond reputeToejam503 has a reputation beyond reputeToejam503 has a reputation beyond reputeToejam503 has a reputation beyond reputeToejam503 has a reputation beyond reputeToejam503 has a reputation beyond repute
Default

Quote:
Originally Posted by 60Gunner View Post
There's that naughty e word again.


I was just referring to the fact that a more efficient an engine runs, the better the performance. Too bad some of the emission controls hinder performance rather than boost it.
Reply With Quote
  #26  
Old 3 Weeks Ago
wedge's Avatar
wedge wedge is offline
XL FORUM TEAM MEMBER
 
Join Date: Jun 2010
Posts: 11,268
Sportster/Buell Model: 1200R
Sportster/Buell Year: 2005
Other Motorcycle Model: 5 bikes and 1 quad
Reputation: 4384412
wedge has a reputation beyond reputewedge has a reputation beyond reputewedge has a reputation beyond reputewedge has a reputation beyond reputewedge has a reputation beyond reputewedge has a reputation beyond reputewedge has a reputation beyond reputewedge has a reputation beyond reputewedge has a reputation beyond reputewedge has a reputation beyond reputewedge has a reputation beyond repute
Default

No doubt 4 valve heads and the cam/lifter setup to run them would be a major boost. You can see the difference if you look at Speedway bikes when they went from two valve to four. You can make a two valve hang with the four valve bikes in the beginners class, but with pro's on both bikes, the four valve will walk away from the two.
__________________
A Biker is not just any guy who rides... that's a motorist.
A guy that gets up and rides again after every crash... that's a Biker.

Whitworth Fork Brace: http://xlforum.net/forums/m...outme&simple=1
Reply With Quote
  #27  
Old 3 Weeks Ago
bustert's Avatar
bustert bustert is offline
XL FORUM TEAM MEMBER
 
Join Date: Jul 2008
Posts: 9,525
Sportster/Buell Model: 1200s
Sportster/Buell Year: 2001
Sportster/Buell Model #2: xlch
Sportster/Buell Year #2: 1974
Reputation: 2711104
bustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond repute
Default

you mean like this??

https://i.redd.it/63uxwihnn4x21.jpg
Reply With Quote
Sponsored Links
  #28  
Old 3 Weeks Ago
Ireeman's Avatar
Ireeman Ireeman is offline
Asgardian
 
Join Date: Jul 2008
Location: Deck of Me boat
Posts: 8,018
Sportster/Buell Model: 883r
Sportster/Buell Year: 2003
Other Motorcycle Model: Chris Craft 32
Other Motorcycle Year: abov
Reputation: 6567594
Ireeman has a reputation beyond reputeIreeman has a reputation beyond reputeIreeman has a reputation beyond reputeIreeman has a reputation beyond reputeIreeman has a reputation beyond reputeIreeman has a reputation beyond reputeIreeman has a reputation beyond reputeIreeman has a reputation beyond reputeIreeman has a reputation beyond reputeIreeman has a reputation beyond reputeIreeman has a reputation beyond repute
Default

Twin swirl combustion chamber is where it is at, ketchup folks.
__________________
Reply With Quote
  #29  
Old 3 Weeks Ago
wedge's Avatar
wedge wedge is offline
XL FORUM TEAM MEMBER
 
Join Date: Jun 2010
Posts: 11,268
Sportster/Buell Model: 1200R
Sportster/Buell Year: 2005
Other Motorcycle Model: 5 bikes and 1 quad
Reputation: 4384412
wedge has a reputation beyond reputewedge has a reputation beyond reputewedge has a reputation beyond reputewedge has a reputation beyond reputewedge has a reputation beyond reputewedge has a reputation beyond reputewedge has a reputation beyond reputewedge has a reputation beyond reputewedge has a reputation beyond reputewedge has a reputation beyond reputewedge has a reputation beyond repute
Default

Quote:
Originally Posted by bustert View Post
Wouldn't that be an 8 valve?
Reply With Quote
  #30  
Old 3 Weeks Ago
bustert's Avatar
bustert bustert is offline
XL FORUM TEAM MEMBER
 
Join Date: Jul 2008
Posts: 9,525
Sportster/Buell Model: 1200s
Sportster/Buell Year: 2001
Sportster/Buell Model #2: xlch
Sportster/Buell Year #2: 1974
Reputation: 2711104
bustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond repute
Default

just showing multiple valving, nothing new been around for eons of time.
latest trend is smaller displacement, force induction and direct injection. big boost in performance and mileage. engine mass has been reduced tremendously.
Reply With Quote
Reply

Bookmarks


Currently Active Users Viewing This Thread: 2 (0 members and 2 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 19:48.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.
XL Forum® - Linson Media LLC