The Sportster and Buell Motorcycle Forum - The XLFORUM®
 

Go Back   The Sportster and Buell Motorcycle Forum - The XLFORUM® > SPORTSTER MOTORCYCLE FORUM > Sportster Motorcycle Era Specific and Model Specific > Ironhead Sportster Motorcycle Talk (1957-1985)
XLF Blogs 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

Active Threads
0 My wife wanted a Swimming Pool
Last Post: 5mel42
Posted On: 1 Minute Ago
Replies: 7
Views: 211
0 2019 East Coast Meet and Greet
Last Post: mick42
Posted On: 1 Minute Ago
Replies: 381
Views: 37,429
0 Crusty's Travels
Last Post: kkbii
Posted On: 3 Minutes Ago
Replies: 2,241
Views: 278,263
0 Rear master cyclinder bore size
Last Post: Toejam503
Posted On: 9 Minutes Ago
Replies: 1
Views: 21
0 Official XL Forum Random Image Thread (NO NUDITY!)
Last Post: Graywolf
Posted On: 10 Minutes Ago
Replies: 44,155
Views: 6,914,067
0 You asked for it! "The Tess' Coffee Thread"
Last Post: Flame__
Posted On: 30 Minutes Ago
Replies: 10,749
Views: 858,418
0 Hottie of the day, no nudity.
Last Post: Stairman
Posted On: 1 Hour Ago
Replies: 11,852
Views: 1,072,376
0 Primary/gearbox chirp
Last Post: davixlrtt
Posted On: 1 Hour Ago
Replies: 10
Views: 609
0 Hot Rods, Rat Rods, and Customs.
Last Post: Stairman
Posted On: 1 Hour Ago
Replies: 3,464
Views: 403,273
0 ***DK CUSTOM PRODUCTS Plug-N-Play for Dyna & Softail Coil Relocation!***
Last Post: DK Custom
Posted On: 1 Hour Ago
Replies: 4
Views: 440
0 DK Coil and Coil/Key Relocation Customer Review and Pics
Last Post: DK Custom
Posted On: 1 Hour Ago
Replies: 83
Views: 20,954
0 ***DK Custom Products V-Coil Relocation Kit for Sportsters***
Last Post: DK Custom
Posted On: 1 Hour Ago
Replies: 1
Views: 256
0 New User, New Parent of an Abused Horse...
Last Post: KevinRandall
Posted On: 1 Hour Ago
Replies: 13
Views: 217
0 Hi
Last Post: KevinRandall
Posted On: 1 Hour Ago
Replies: 14
Views: 112
0 Riding in The Heat!
Last Post: Stairman
Posted On: 2 Hours Ago
Replies: 33
Views: 1,020
0 What Petcock
Last Post: GA_Ironhead
Posted On: 2 Hours Ago
Replies: 25
Views: 2,530
0 Efi and carbs
Last Post: motorend
Posted On: 3 Hours Ago
Replies: 50
Views: 1,047
0 Mandatory Motorcycle Inspections
Last Post: NLXL
Posted On: 3 Hours Ago
Replies: 159
Views: 22,297
0 head and cylinder painting
Last Post: xlhshawn
Posted On: 4 Hours Ago
Replies: 25
Views: 910
0 Bike lost power,back fired and stalled
Last Post: zack74
Posted On: 5 Hours Ago
Replies: 125
Views: 3,534
0 Roads I'd like to ride.
Last Post: Stairman
Posted On: 5 Hours Ago
Replies: 1,906
Views: 159,617
0 Harley quoted me $1300 for a mini ape install
Last Post: xena
Posted On: 5 Hours Ago
Replies: 178
Views: 37,603
0 7 Dead and more wounded
Last Post: seajay
Posted On: 5 Hours Ago
Replies: 34
Views: 1,481
0 surges and/or hunting on 1200 EFI's
Last Post: hammer6315
Posted On: 6 Hours Ago
Replies: 102
Views: 27,363
0 Food porn
Last Post: Graywolf
Posted On: 7 Hours Ago
Replies: 1,411
Views: 240,742
0 ....1
Last Post: Graywolf
Posted On: 7 Hours Ago
Replies: 4,887
Views: 283,130
0 Share your Sunrise OR Sunset Photos!
Last Post: Jesus Jon
Posted On: 7 Hours Ago
Replies: 13
Views: 451
0 When Were You Born?
Last Post: hammer6315
Posted On: 7 Hours Ago
Replies: 331
Views: 79,266
0 Parrothead and the 2019 Iron Butt Rally
Last Post: shanneba
Posted On: 8 Hours Ago
Replies: 67
Views: 3,026
0 Robbie's uncomfortable seat theory
Last Post: jazzman
Posted On: 8 Hours Ago
Replies: 29
Views: 960
More...
Members Birthdays
Sponsored Links
Reply
 
Share Thread Tools Display Modes
  #11  
Old 20th May 2019
frogg_nutts frogg_nutts is offline
Master Mechanic
 
Join Date: Dec 2007
Location: Seagoville
Posts: 296
Sportster/Buell Model: XLCH
Sportster/Buell Year: 72
Other Motorcycle Model: XLH
Other Motorcycle Year: 80
Reputation: 99194
frogg_nutts has much to be proud offrogg_nutts has much to be proud offrogg_nutts has much to be proud offrogg_nutts has much to be proud offrogg_nutts has much to be proud offrogg_nutts has much to be proud offrogg_nutts has much to be proud offrogg_nutts has much to be proud offrogg_nutts has much to be proud offrogg_nutts has much to be proud offrogg_nutts has much to be proud of
Default

"vintage road racer" eh?
What do ya think a Ironhead is?
Reply With Quote
  #12  
Old 20th May 2019
Scott Scott is offline
Flat Track Racer
 
Join Date: Oct 2018
Posts: 218
Sportster/Buell Model: XL racebike in progress
Sportster/Buell Year: 1981
Other Motorcycle Model: Moto Guzzi V11 Lemans
Other Motorcycle Year: 2002
Reputation: 128263
Scott has much to be proud ofScott has much to be proud ofScott has much to be proud ofScott has much to be proud ofScott has much to be proud ofScott has much to be proud ofScott has much to be proud ofScott has much to be proud ofScott has much to be proud ofScott has much to be proud ofScott has much to be proud of
Default

Quote:
Originally Posted by frogg_nutts View Post
"vintage road racer" eh?
What do ya think a Ironhead is?
Not sure what you mean, but I'll give a long winded response anyway.

My plan is to race in the USCRA Heavyweight Supervintage class. Go to the rulebook at www.race-uscra.com for class definitions. The class I'm aiming for is for 1972 and earlier bikes, and post-1972 bikes that haven't changed much since the actual period. All 1000 cc ironheads fit into this class. The rules allow me to do pretty much anything with the engine, as long as it looks relatively stock and doesn't exceed stock displacement. I've been focusing on the chassis since last winter and plan to start on the engine in the fall, money allowing. I've never seen an ironhead road racing. Maybe there's a good reason and I'm dumping a ton of money for no reason. Here's the bike as of late last winter. I've since added 14.5" shocks and moved the pegs up and forward. If you look closely, the angle of the rod to the rear master cylinder is bad. I've since changed that.

Imgur is only letting me post huge photos. If you're curious, here's a link to the older photos:

https://i.imgur.com/DfhsWzQ.jpg

https://i.imgur.com/kzn7Zbz.jpg
Reply With Quote
  #13  
Old 20th May 2019
doodah man's Avatar
doodah man doodah man is offline
Senior Master Custom Bike Builder
 
Join Date: May 2009
Location: 37° 25' 28" N by -80° 03' 42" W
Posts: 10,069
Sportster/Buell Model: XLCH
Sportster/Buell Year: 1975
Reputation: 644326
doodah man has a reputation beyond reputedoodah man has a reputation beyond reputedoodah man has a reputation beyond reputedoodah man has a reputation beyond reputedoodah man has a reputation beyond reputedoodah man has a reputation beyond reputedoodah man has a reputation beyond reputedoodah man has a reputation beyond reputedoodah man has a reputation beyond reputedoodah man has a reputation beyond reputedoodah man has a reputation beyond repute
Default

It looks like a fun endeavor, too bad you can’t do a stroker crank and get an unfair advantage over the other racers! - no change in displacement. They won’t notice if you were to add 200 more little old cc’s will they?
__________________
i cut my deck to the queen of spades, but the cards were all the same
Reply With Quote
  #14  
Old 20th May 2019
Scott Scott is offline
Flat Track Racer
 
Join Date: Oct 2018
Posts: 218
Sportster/Buell Model: XL racebike in progress
Sportster/Buell Year: 1981
Other Motorcycle Model: Moto Guzzi V11 Lemans
Other Motorcycle Year: 2002
Reputation: 128263
Scott has much to be proud ofScott has much to be proud ofScott has much to be proud ofScott has much to be proud ofScott has much to be proud ofScott has much to be proud ofScott has much to be proud ofScott has much to be proud ofScott has much to be proud ofScott has much to be proud ofScott has much to be proud of
Default

I’m not sure the extra inches would help. I think this bike will rule in a straight line; it’s turning I’m wondering about. I’m thinking the heavy flywheels will act like a gyroscope and make it want to keep going straight and not lean. S&S, Truett and Osbourn, and people on this board told me not to lighten the crank. We’ll see.

Nobody will bitch about mild cheating that isn’t obvious until I start winning races!
Reply With Quote
  #15  
Old 20th May 2019
Scott Scott is offline
Flat Track Racer
 
Join Date: Oct 2018
Posts: 218
Sportster/Buell Model: XL racebike in progress
Sportster/Buell Year: 1981
Other Motorcycle Model: Moto Guzzi V11 Lemans
Other Motorcycle Year: 2002
Reputation: 128263
Scott has much to be proud ofScott has much to be proud ofScott has much to be proud ofScott has much to be proud ofScott has much to be proud ofScott has much to be proud ofScott has much to be proud ofScott has much to be proud ofScott has much to be proud ofScott has much to be proud ofScott has much to be proud of
Default

One last thing - Keenan Tatro was kind enough to give me some of his time. He suggested I cut an inch out of the down tubes to derake it a bit, which makes sense. He also suggested drag pipes 30-34” long. That goes against a lot of what I’ve heard here. I’d appreciate any input people have.
Reply With Quote
  #16  
Old 20th May 2019
needspeed needspeed is offline
XL FORUM LIFE MEMBER
 
Join Date: May 2014
Posts: 906
Sportster/Buell Model: xlh
Sportster/Buell Year: 1974
Reputation: 258744
needspeed has a brilliant futureneedspeed has a brilliant futureneedspeed has a brilliant futureneedspeed has a brilliant futureneedspeed has a brilliant futureneedspeed has a brilliant futureneedspeed has a brilliant futureneedspeed has a brilliant futureneedspeed has a brilliant futureneedspeed has a brilliant futureneedspeed has a brilliant future
Default

Quote:
Originally Posted by Scott View Post
.... S&S, Truett and Osbourn, and people on this board told me not to lighten the crank. We’ll see....
I'm not questioning their advice and for my own edification, did S+S and Truett and Osborn give a reason for not lightening the flywheels?
A performance concern, durability or just not worth the effort?

Another comment on crankshaft weight. I know you were considering S+S connecting rods. Those are going to add weight to the crank and some of it reciprocating. For your basically stock engine I think a good set of stock rods with proper bearing clearance would be fine. But I've never done what you're trying to do and others may disagree.
Reply With Quote
  #17  
Old 20th May 2019
brucstoudt's Avatar
brucstoudt brucstoudt is offline
Senior Master Custom Bike Builder
 
Join Date: May 2010
Location: Pottstown PA.
Posts: 13,164
Sportster/Buell Model: xlch
Sportster/Buell Year: 1960
Reputation: 281447
brucstoudt has a reputation beyond reputebrucstoudt has a reputation beyond reputebrucstoudt has a reputation beyond reputebrucstoudt has a reputation beyond reputebrucstoudt has a reputation beyond reputebrucstoudt has a reputation beyond reputebrucstoudt has a reputation beyond reputebrucstoudt has a reputation beyond reputebrucstoudt has a reputation beyond reputebrucstoudt has a reputation beyond reputebrucstoudt has a reputation beyond repute
Default

coming from a guy with 36'' XLR pipes I think you would be better off with a 2 into 1 pipe for more low rpm torque pulling out of the tight turns through the infield on a road race track.
__________________
72 1000cc barrels and heads, s&s 41/2'' flywheels, sifton cams, s&s super B w/ zippers thunderjet w/yost powertube, andrews gears,and shafts, competition engineering kevlar wet or dry clutch, 72 oil pump, morris magneto w/auto advance and single fire module, cycle electric generator w/electronic regulator,73 cu.in.
Reply With Quote
  #18  
Old 21st May 2019
Scott Scott is offline
Flat Track Racer
 
Join Date: Oct 2018
Posts: 218
Sportster/Buell Model: XL racebike in progress
Sportster/Buell Year: 1981
Other Motorcycle Model: Moto Guzzi V11 Lemans
Other Motorcycle Year: 2002
Reputation: 128263
Scott has much to be proud ofScott has much to be proud ofScott has much to be proud ofScott has much to be proud ofScott has much to be proud ofScott has much to be proud ofScott has much to be proud ofScott has much to be proud ofScott has much to be proud ofScott has much to be proud ofScott has much to be proud of
Default

Needspeed - I spoke with the tech support dept. at S&S asking about purchasing a completely assembled bottom end with their wheels and rods. The guy told me simply that they don't lighten wheels - end of story. I didn't ask further because he seemed eager to end the call. Truett and Osborne said that lightened wheels are too difficult to balance. Tatro simply said something along the lines of "lightened flywheels suck, but I'll do what you want." People on this board said I'd lose a lot of low and midrange power. I didn't realize S&S rods are heavier than stock. Ferrous Head said that he's had stock wheels crack. I'd love to save a bunch of money and just use the stock bottom end, but the potential price if they fail would be high.

Brucstoudt - You're confirming what I thought. I'm guessing that drags would be best flat tracking where RPMs stay high and fairly consistent. I've seen some beautiful homemade 2-into-1 exhausts on this forum. I hope I can do something 1/2 as nice. I plan to get a bunch on bends, tack them together with my elderly Harbor Freight MIG, and bring the whole thing to my friend who welds professionally.

Here's what may be a dumb question, but something I've wondered about for a while. Can you take a complete exhaust for an Evo Sportster, cut off the Evo-specific part where the pipes meet the heads, and weld on the appropriate ironhead sections (cut from an old set of drags)? Well, I know you can, but would it work?
Reply With Quote
Sponsored Links
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 20:00.


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