MotoHouston.com MotoHouston.com
Register Members List Member Map Media Calendar Garage Forum Home Mark Forums Read

Go Back   MotoHouston.com > Technical > How To's and Q & A's
Forgot info?

Welcome to MotoHouston.com! You are currently viewing our forums as a guest which gives you limited access to the community. By joining our free community you will have access to great discounts from our sponsors, the ability to post topics, communicate privately with other members, respond to polls, upload content, free email, classifieds, and access many other special features. Registration is fast, simple and absolutely free, join our community!

Register Today!

If you have any problems with the registration process or your account login, please contact us.


FREE MH Decals by MAIL!

Advertisement

Reply
Share This Thread: 
Subscribe to this Thread Thread Tools
Old 04-07-2010, 08:40 PM   #1
tearrep7
Banned
 
Join Date: Mar 2010
Location: west Houston
Feedback Rating: (0)
Posts: 110

Experience: 1-3 months
Trackdays: 1











Send a message via AIM to tearrep7
User is banned

.
tearrep7 is offline   Reply With Quote
Similar Topics
Thread Thread Starter Forum Replies Last Post
What do you think about cutting an exhaust can down? r6racer Performance and Modifications 14 03-04-2013 07:44 AM
cutting the exhaust on a small parallel twin loosenoose Performance and Modifications 11 10-16-2012 06:30 AM
Cutting Exhaust JX3 How To's and Q & A's 14 06-29-2009 04:48 PM
Cutting the Exhaust Can on a F4i? hawkeye717 How To's and Q & A's 5 04-09-2009 06:10 PM
Pro and Cons of a Slipper clutch? 0oAndyo0 General Discussion (Moto Related) 10 03-14-2006 02:38 PM
Advertisement
Old 04-07-2010, 08:49 PM   #2
CaligoneTx
Forest Gnome Tour Guide
 
CaligoneTx's Avatar
 
Join Date: Sep 2007
Location: Valhalla
Feedback Rating: (1)
Posts: 21,558

Experience: 10+ years

Bike(s):
Triumph 675r
Ducati 748
Hyosungs (250r + 650r)
Honda 900rr
Suzuki Busa1300r (+2 bikes)






Send a message via AIM to CaligoneTx Send a message via Yahoo to CaligoneTx
stock cans have baffling that restricts the outgoing pulsations of the engine by only allowing around the same volume to exit out of the tip of the muffler as one of the manifold runners. This is why the tone is even and smooth.

Cutting out the baffle and reinstalling the tip will make it considerably louder. Yes, backpressure will be reduced. Keep in mind the manifold itself will also restrict backpressure.

Most slip ons are straight through designs w minor baffling using a restrictive tube w holes cut in it to cause more reverberating backpressure as the volume increases through the tube.

Wo backpressure the point where the intake and the exhaust valves are open at the same time would cause the mixture to come out of the exhaust and limit the efficiency of the engine. This can also cause the burning of exhaust valves.

There are a few picture/step-by-step threads for cutting oem cans and a/m cans shorter and removing baffles.
__________________
triumphsig
CaligoneTx is offline   Reply With Quote
Old 04-07-2010, 09:07 PM   #3
tearrep7
Banned
 
Join Date: Mar 2010
Location: west Houston
Feedback Rating: (0)
Posts: 110

Experience: 1-3 months
Trackdays: 1











Send a message via AIM to tearrep7
User is banned

.
tearrep7 is offline   Reply With Quote
Old 04-07-2010, 10:51 PM   #4
burnboy
upliftmofopartyplan
 
burnboy's Avatar
 
Join Date: Mar 2008
Feedback Rating: (0)
Posts: 3,609

Experience: 5 years

Bike(s):
2011 kawi z 1000









he's saying you could burn exhaust valves. do it and get a tune. theres your $500. dont come too quick. just be patient. get a pipe you like and get a tune and you'll have longevity and style
__________________
f,f&f 4 ever R.I.P. coach dave
burnboy is offline   Reply With Quote
Old 04-07-2010, 10:56 PM   #5
zombiejesus
braaaaiiiiinssss
 
zombiejesus's Avatar
 
Join Date: Jul 2009
Location: sw
Feedback Rating: (1)
Posts: 1,721

Experience: 2 years

Bike(s):
┌∩┐(◕_◕)┌∩┐









Quote:
Originally Posted by CaligoneTx View Post
stock cans have baffling that restricts the outgoing pulsations of the engine by only allowing around the same volume to exit out of the tip of the muffler as one of the manifold runners. This is why the tone is even and smooth.

Cutting out the baffle and reinstalling the tip will make it considerably louder. Yes, backpressure will be reduced. Keep in mind the manifold itself will also restrict backpressure.

Most slip ons are straight through designs w minor baffling using a restrictive tube w holes cut in it to cause more reverberating backpressure as the volume increases through the tube.

Wo backpressure the point where the intake and the exhaust valves are open at the same time would cause the mixture to come out of the exhaust and limit the efficiency of the engine. This can also cause the burning of exhaust valves.

There are a few picture/step-by-step threads for cutting oem cans and a/m cans shorter and removing baffles.
Let's say I've installed a jet kit and it's running rich. No way to adjust A/F ratio without drilling holes in the carbs, which I don't want to do. Exhaust system is coming off tomorrow anyways. You think chopping the muffler would let enough extra air flow through to balance out the loss in back pressure?
__________________
zombiejesus is offline   Reply With Quote
Old 04-08-2010, 07:51 PM   #6
tearrep7
Banned
 
Join Date: Mar 2010
Location: west Houston
Feedback Rating: (0)
Posts: 110

Experience: 1-3 months
Trackdays: 1











Send a message via AIM to tearrep7
User is banned

.
tearrep7 is offline   Reply With Quote
Old 04-08-2010, 07:58 PM   #7
ForgottnSoul
MotoMilitia Choosen 9
 
ForgottnSoul's Avatar
 
Join Date: Aug 2007
Location: League City
Feedback Rating: (1)
Posts: 1,698

Experience: 10+ years

Bike(s):
2008 Special Edition ZX-14




Member Garage





Heres the deal.......... dont take chances. Its when u cut corners and try to half A$$ things that u run into problems. You can get some cheap slip ons out there that wont cost u $500 and at least then ull be doing it right.
ForgottnSoul is offline   Reply With Quote
Old 04-08-2010, 08:17 PM   #8
CaligoneTx
Forest Gnome Tour Guide
 
CaligoneTx's Avatar
 
Join Date: Sep 2007
Location: Valhalla
Feedback Rating: (1)
Posts: 21,558

Experience: 10+ years

Bike(s):
Triumph 675r
Ducati 748
Hyosungs (250r + 650r)
Honda 900rr
Suzuki Busa1300r (+2 bikes)






Send a message via AIM to CaligoneTx Send a message via Yahoo to CaligoneTx
If your final output is below the volume of half your runner volume together, you should have some back pressure.
__________________
triumphsig
CaligoneTx is offline   Reply With Quote
Reply


Thread Tools

Advertisement


All times are GMT -5. The time now is 11:32 AM.


MotoHouston.com is not responsible for the content posted by users.
Privacy Policy