Ducati Monster Forum

Moto Board => Tech => Topic started by: mysticbluex3 on December 16, 2011, 09:57:23 AM

Title: Exhaust; one warm, one cold?
Post by: mysticbluex3 on December 16, 2011, 09:57:23 AM
So I noticed that when I'm warming my bike up in the AM, the exhaust coming out from one side is warm and the other side is cold?  Why is that?  Its a 09 M696.
Title: Re: Exhaust; one warm, one cold?
Post by: stopintime on December 16, 2011, 10:11:12 AM
I have that and I blame it on global warming.

I've heard it's normal, but I can't say I understand why.
My guess is it has to do with exhaust flow being uneven between the two pipes.
If it happened on a bike with two individual pipes and cans, it would need work...

[popcorn]
Title: Re: Exhaust; one warm, one cold?
Post by: Skyshadow on December 16, 2011, 02:53:18 PM
Your mufflers are cold? like after the X pipe?
Title: Re: Exhaust; one warm, one cold?
Post by: battlecry on December 16, 2011, 05:27:27 PM
It is the Coriolis force.  If you take your Monster to Oz or Argentina, the hot and cold mufflers will reverse.
Title: Re: Exhaust; one warm, one cold?
Post by: alibaba on December 16, 2011, 09:20:35 PM
2009 M696  -  exactly the same issue.  I would like to hear a definitive answer. 

I wonder if I turned the bike 180 degrees if the issue would change sides?  ;-)
Title: Re: Exhaust; one warm, one cold?
Post by: Two dogs on December 17, 2011, 04:35:52 AM
Did you check if a kitten had crawled into one.
Title: Re: Exhaust; one warm, one cold?
Post by: Dellikose on December 19, 2011, 11:41:11 AM
Quote from: Two dogs on December 17, 2011, 04:35:52 AM
Did you check if a kitten had crawled into one.

Hahaha... "I have fur coming out of one of my pipes ???"

;)
Title: Re: Exhaust; one warm, one cold?
Post by: Raux on December 19, 2011, 11:52:57 AM
actually not a joke. i've heard of things crawling in the pipes. check for flow

as far as cold hot. if you look at the flow of the exhaust you'll see one flows more smoothly, less turns for the exhaust to snake.
Title: Re: Exhaust; one warm, one cold?
Post by: koko64 on December 19, 2011, 03:32:47 PM
 
Quote from: battlecry on December 16, 2011, 05:27:27 PM
It is the Coriolis force.  If you take your Monster to Oz or Argentina, the hot and cold mufflers will reverse.
[laugh] [beer]
Title: Re: Exhaust; one warm, one cold?
Post by: ManaloEA on December 19, 2011, 04:42:13 PM
Quote from: Raux on December 19, 2011, 11:52:57 AM
actually not a joke. i've heard of things crawling in the pipes. check for flow

as far as cold hot. if you look at the flow of the exhaust you'll see one flows more smoothly, less turns for the exhaust to snake.
Wouldn't that cause different backpressure? And therefore different performance between cylinders?
Title: Re: Exhaust; one warm, one cold?
Post by: Raux on December 19, 2011, 07:18:47 PM
After the crossover. should be no issue