The Sportster and Buell Motorcycle Forum Biltwell  

Go Back   The Sportster and Buell Motorcycle Forum > SPORTSTER MOTORCYCLE ZONE > Sportster Motorcycle Era Specific and Model Specific > Ironhead Sportster Motorcycle Talk (1957-1985)
XLF Gallery XLF Classifieds XLF Blogs XLF Shout XLF Arcade XLF Disclaimer/Privacy Statement/Terms Of Use

Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

Members Birthdays
ziggyhd1 (56), greven (54)
Speedway Instruments
Bison Motorsports
Fix My Hog
Lowbrow Customs

CV Performance
Reply
 
Share Thread Tools Display Modes
  #1  
Old 12th September 2009
1982ironhead's Avatar
1982ironhead 1982ironhead is offline
Bike Builder
 
Join Date: Apr 2009
Location: WNC
Posts: 1,826
Sportster/Buell Model: xlh1000
Sportster/Buell Year: 1982
Other Motorcycle Model: Triumph
Other Motorcycle Year: 196x
Reputation: 185
1982ironhead is on a distinguished road1982ironhead is on a distinguished road
Question why isnt this Super B a 45mm venturi carb?

borrowing a friends carb off his 79 1200(stroker?) sportster that has sat the last 5 years, it sat in parts cleaner overnight to clean it up, but i was wandering if they made 40mm versions? it is 40mm at the smallest point and looks real old, it had Super B stamped on the side though, so whats up with that (only 40mm)?
Reply With Quote
  #2  
Old 12th September 2009
72Iron's Avatar
72Iron 72Iron is offline
Senior Chief Know It All 2nd Class
 
Join Date: Jul 2009
Posts: 1,406
Sportster/Buell Model: XLH
Sportster/Buell Year: 1972
Sportster/Buell Model #2: Harley-Davidson
Sportster/Buell Year #2: 2009
Other Motorcycle Model: FLHTCU (Geezer Glide)
Reputation: 7813
72Iron is just really nice72Iron is just really nice72Iron is just really nice72Iron is just really nice72Iron is just really nice72Iron is just really nice72Iron is just really nice72Iron is just really nice72Iron is just really nice72Iron is just really nice72Iron is just really nice
Default

The Super B is a 1 7/8 carb, which equals to 47.625mm.

S&S Uses SAE measure, not metric.
__________________
I gave up smoking, drinking and sex.
It was the worst fifteen minutes of my life.

RIP: Eli
Reply With Quote
  #3  
Old 12th September 2009
1982ironhead's Avatar
1982ironhead 1982ironhead is offline
Bike Builder
 
Join Date: Apr 2009
Location: WNC
Posts: 1,826
Sportster/Buell Model: xlh1000
Sportster/Buell Year: 1982
Other Motorcycle Model: Triumph
Other Motorcycle Year: 196x
Reputation: 185
1982ironhead is on a distinguished road1982ironhead is on a distinguished road
Default

Quote:
S&S Uses SAE measure, not metric.
most other carbs are metric and the S&S booklet lists it as a 45mm venturi (the smallest part about half way down the bore)
i just thought it was weird that it is a B but only 40mm, were the early models different or is there any varience to the b models at all?
Reply With Quote
  #4  
Old 12th September 2009
72Iron's Avatar
72Iron 72Iron is offline
Senior Chief Know It All 2nd Class
 
Join Date: Jul 2009
Posts: 1,406
Sportster/Buell Model: XLH
Sportster/Buell Year: 1972
Sportster/Buell Model #2: Harley-Davidson
Sportster/Buell Year #2: 2009
Other Motorcycle Model: FLHTCU (Geezer Glide)
Reputation: 7813
72Iron is just really nice72Iron is just really nice72Iron is just really nice72Iron is just really nice72Iron is just really nice72Iron is just really nice72Iron is just really nice72Iron is just really nice72Iron is just really nice72Iron is just really nice72Iron is just really nice
Default

Introduction
S&S« Super B carburetor is a butterfly type carb with a fully
adjustable idle mixture screw and changeable mid range and
high speed jets. This carburetor does not have an accelerator
pump nor a conventional choke, but utilizes a mixture
enrichment device for starting. The Super B has a 17⁄8” (47.6mm)
throat at the butterfly and a 19⁄16” (39.6mm) venturi and is
identified by an “B” cast into the throttle return spring side of
the carb body below the cast in wording “S&S SUPER”.

http://www.sscycle.com/admin/uploads...ns/51-1006.pdf

Most other carbs aren't made in the USA.

What book are you refering to?
Reply With Quote
  #5  
Old 12th September 2009
ericfreeman's Avatar
ericfreeman ericfreeman is offline
XL FORUM TEAM MEMBER
 
Join Date: May 2007
Posts: 4,427
Sportster/Buell Model: Ironhead XLH Sportster
Sportster/Buell Year: 1978
Sportster/Buell Model #2: Ironhead XLT Sportster
Sportster/Buell Year #2: 1977
Other Motorcycle Model: Honda CBX 1000
Other Motorcycle Year: 1979
Reputation: 18421
ericfreeman is a name known to allericfreeman is a name known to allericfreeman is a name known to allericfreeman is a name known to allericfreeman is a name known to allericfreeman is a name known to allericfreeman is a name known to allericfreeman is a name known to allericfreeman is a name known to allericfreeman is a name known to allericfreeman is a name known to all
Default

Most carburetors are sized by the diameter of the throttle butterfly, not by the size of the inner venturi, e.g. a 40mm Weber DCOE has 2 40mm brass butterflies while the actual venturi size is smaller.

Eric
__________________
1978 Anniversary Edition XLH. Wiseco 10:1 forged pistons, Andrews R5 cams, dual plugged heads with Super Port Flow, single fire ignition, Mikuni Solex 36 PHH carb, Jagg oil cooler, '73 gauges, kickstart, Barnett kevlar clutch, Progressive front springs, Hagon Nitro shocks, all-Andrews tranny. 1977 XLT, Mikuni Solex 36 PHH carb, tapered dual exhausts, Andrews Y cams, Progressive front springs, Hagon Nitro shocks.

Last edited by ericfreeman; 13th September 2009 at 01:10..
Reply With Quote
Know Thy Hog

  #6  
Old 12th September 2009
1982ironhead's Avatar
1982ironhead 1982ironhead is offline
Bike Builder
 
Join Date: Apr 2009
Location: WNC
Posts: 1,826
Sportster/Buell Model: xlh1000
Sportster/Buell Year: 1982
Other Motorcycle Model: Triumph
Other Motorcycle Year: 196x
Reputation: 185
1982ironhead is on a distinguished road1982ironhead is on a distinguished road
Default

well i tried on the Super B and it ran pretty good, i just found out the other bike was not a 1200 but a 1000 like mine, after setting the idle speed and fuel mixture it ran pretty good, but not much better than my bendix, which i measures as a 36mm last night. throttle controll is important with this carb, about 1/4 is all that you need up till 4000+rpm then roll it on fast! it pulls a little better burnout but i doubt it would gain me any more than a few tenths or so in the 1/8th mile. i might see 8.8-8.9.

well i figured my issue was the condenser, mostly, the bendix had some issues as well. but i got the dyna s coming monday or tuesday and now i know it was just my points setup causing issues i can confidently install the dyna without worry of frying it.


the booklet im refering to is the S&S one dad got with his Super E which also covers the Super B a little
Reply With Quote
  #7  
Old 12th September 2009
1982ironhead's Avatar
1982ironhead 1982ironhead is offline
Bike Builder
 
Join Date: Apr 2009
Location: WNC
Posts: 1,826
Sportster/Buell Model: xlh1000
Sportster/Buell Year: 1982
Other Motorcycle Model: Triumph
Other Motorcycle Year: 196x
Reputation: 185
1982ironhead is on a distinguished road1982ironhead is on a distinguished road
Default

looks a lot like the booklet in your link except it has the Super E also




just looked at it it is a 44.5mm venturi...... for the super "G" sorry my mistake!
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


Custom Search

All times are GMT +1. The time now is 14:25.


Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
XL Forum - Linson Media LLC