Crankcase breather outer diameter - Triumph Forum: Triumph Rat Motorcycle Forums
» Main Menu

Discussion Forums
 » Twins
 » Tiger
 » General
 » RAT

Features
 » Blogs

Motorcycle.com Links

Contribute
 » Photo

Motorcycle Forums
» Insurance
» Sponsors
» Our Partners
»ATV Reviews
»Motorcycle Games

Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, T100, Speedmaster, America, Thruxton, and Scrambler.

Reply
 
LinkBack Thread Tools Display Modes
Old 11-02-2012, 01:49 AM   #1 (permalink)
Senior Member
Formula Extreme
Main Motorcycle: '01 Triumph Bonneville
 
Join Date: Sep 2012
Location: Berkeley
Posts: 895
Crankcase breather outer diameter

What outer diameter crankcase breather do I need for the stock crankcase breather hose?

I read through 11 pages of Forchetto's "free horsepower" thread and couldn't find this info.

Thanks!
luckyduck is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 11-02-2012, 12:48 PM   #2 (permalink)
Senior Member
Formula Extreme
Main Motorcycle: '01 Triumph Bonneville
 
Join Date: Sep 2012
Location: Berkeley
Posts: 895
Any help on this one?
luckyduck is offline   Reply With Quote Quick reply to this message
Old 11-02-2012, 01:13 PM   #3 (permalink)
Senior Member
Formula Extreme
Main Motorcycle: Suzuki GSF 1250S Bandit
 
Join Date: Jan 2012
Location: Lincoln UK
Posts: 514
12 - 13 mm
denbow is offline   Reply With Quote Quick reply to this message
Old 11-02-2012, 01:59 PM   #4 (permalink)
Lifetime Premium
Site Supporter
Legend
Main Motorcycle: 2009 Bonneville SE
 
Forchetto's Avatar
 
Join Date: Jun 2009
Location: Asturias, Spain
Posts: 13,833
Other Motorcycle: Yamaha XV1100
Extra Motorcycle: Qingqi QM200GY-BA
Bonnies up to 2005 or 2006 had 6 mm (around 1/4") outlet breathers, from then on they have 13mm (1/2").
Forchetto is offline   Reply With Quote Quick reply to this message
Old 11-02-2012, 02:23 PM   #5 (permalink)
Senior Member
Formula Extreme
Main Motorcycle: '01 Triumph Bonneville
 
Join Date: Sep 2012
Location: Berkeley
Posts: 895
Wow that's a large difference in the I/D of the housing. I wonder if it's worth it to upgrade the hose on my '01 from 6mm to 12mm. I'd imagine that I'd need to use some sort of reducer on the outlet from the crankcase.
luckyduck is offline   Reply With Quote Quick reply to this message
Old 11-02-2012, 02:38 PM   #6 (permalink)
triumphrat.net Vendor
World SuperBike
 
Retro-Racer's Avatar
 
Join Date: Jul 2007
Posts: 2,015
1/2" at the end of the stock breather hose.

/M
__________________
"With integrity, nothing else matters. Without integrity, nothing else matters."
Retro-Racer is offline   Reply With Quote Quick reply to this message
Old 11-02-2012, 02:42 PM   #7 (permalink)
Lifetime Premium
Site Supporter
Legend
Main Motorcycle: 2009 Bonneville SE
 
Forchetto's Avatar
 
Join Date: Jun 2009
Location: Asturias, Spain
Posts: 13,833
Other Motorcycle: Yamaha XV1100
Extra Motorcycle: Qingqi QM200GY-BA
Bob Farnham tuning in the UK removes the clutch to re-drill the crankcase to accept the newer 13mm (1/2") outlet.

The increase in outlet diameter might not seem much but you have to consider the area, not just the diameter. Doubling the Diameter increases area by four times.

6mm diameter breather pipe area = 28.27mm2

13mm breather area = 132.73mm2

Earlier bikes, up to VIN number 221608, had their breather hose outlet spigot attached to the inner pipe/seal assembly, like this:



Later ones don't have that pipe and the spigot is just a push-in fitting I believe. Not sure how it's held in the crankcase.

Last edited by Forchetto; 11-03-2012 at 06:04 AM.
Forchetto is offline   Reply With Quote Quick reply to this message
Old 11-03-2012, 11:24 AM   #8 (permalink)
Premium Member
Site Supporter
Team Owner
Main Motorcycle: 2008 Bonneville Black
 
BonnieBlack's Avatar
 
Join Date: Aug 2008
Location: Fountain City, WI
Posts: 5,152
Other Motorcycle: Spousal 2009 Bonnie Black
I use a UNI UP-123 on my 2008 Bonnie, using the original breather hose. It's a 1/2"

Bike Bandit lists the same breather hose for the 2001 as for the 2008. I'm a bit confused the the picture above and the reference to 1/4", so I hope I'm not answering the wrong question.
__________________
I used to be disgusted, but now I try to be amused.

"It's not what you look at that matters, it's what you see." -- Thoreau
BonnieBlack is offline   Reply With Quote Quick reply to this message
Old 11-03-2012, 01:51 PM   #9 (permalink)
Lifetime Premium
Site Supporter
Legend
Main Motorcycle: 2009 Bonneville SE
 
Forchetto's Avatar
 
Join Date: Jun 2009
Location: Asturias, Spain
Posts: 13,833
Other Motorcycle: Yamaha XV1100
Extra Motorcycle: Qingqi QM200GY-BA
Quote:
Originally Posted by BonnieBlack View Post
Bike Bandit lists the same breather hose for the 2001 as for the 2008. I'm a bit confused the the picture above and the reference to 1/4", so I hope I'm not answering the wrong question.
There are two different breather hoses listed in World of Triumph:

Up to VIN 221608 plus numbers 229407 to 230164 the breather outlet hose is part number T2201705

Newer engines use hose T2200189


Source:

http://www.worldoftriumph.com/triump...&block_03=3130
Forchetto is offline   Reply With Quote Quick reply to this message
Old 11-09-2012, 05:01 PM   #10 (permalink)
Senior Member
Formula Extreme
Main Motorcycle: '01 Triumph Bonneville
 
Join Date: Sep 2012
Location: Berkeley
Posts: 895
Ok so I measure my breather hose inner diameter with a pair of calipers and its .05 inches or about 12mm. So I guess I have a newer breather system on my 2001 bonnie?
luckyduck is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Triumph Forum: Triumph Rat Motorcycle Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter your valid email address, that can receive an automated confirmation message. Otherwise, you won't be able to gain full access.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



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
Trackbacks are Off
Pingbacks are Off
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Crankcase Breather Mod Scorch Triumph SuperSports 7 10-03-2011 01:19 PM
Crankcase breather (I think) rubado Twins Technical Talk 3 07-28-2011 02:14 PM
Crankcase breather mod... Flaco Twins Technical Talk 9 04-21-2009 06:46 AM
UNI Crankcase Breather Gwiaz Twins Technical Talk 6 08-17-2007 11:09 PM
Crankcase breather ??? danbike Twins Talk 5 04-15-2006 03:36 PM

Powered by vBadvanced CMPS v3.2.2

All times are GMT -4. The time now is 07:17 AM.



Motorcycle News, Videos and Reviews
Honda Grom Forum Harley Davidson Forum Honda 600RR Kawasaki Forum Yamaha R6 Forum Yamaha FZ-09 Forum
1199 Panigale Forum Roadglide Forum Honda CBR1000 Forum Vulcan Forum Yamaha R1 Forum Yamaha R3 Forum
Ducati Monster Forum Harley Forums Honda CBR250R Forum ZX10R Forum Star Raider Forum Yamaha Viking Forum
Suzuki GSXR Forum V-Rod Forums Honda Shadow Forum Kawasaki Motorcycle Forum Star Warrior Forum KTM Duke 390 Forum
SV650 Forum BMW S1000RR Forum Honda Fury Forum Kawasaki Versys Forum Drag Racing Forum Ducati 899 Panigale Forum
Suzuki V-Strom BMW K1600 Triumph Forum Victory Forums Sportbikes BMW NineT Forum
Volusia Forum BMW F800 Forum Triumph 675 Forum MV Agusta Forum HD Street Forum Suzuki GW250 Forum
Yamaha Motorcycles Victory Gunner Forum Honda Vultus Forum HD LiveWire Forum

Garage Plus vBulletin Plugins by Drive Thru Online, Inc.

Search Engine Optimization by vBSEO 3.6.0