Will fitting a baffle affect performance? - SV650.org

26-07-10, 08:19 AM

Have a scorpian can on sv, will taking the baffle out increase fule consumption and decrease performance?

26-07-10, 09:38 AM

no

Biker Biggles · 26-07-10, 10:23 AM

Perhaps.Try looking in the Tuning and Tweaking section

26-07-10, 11:09 AM

Hasnt made any difference to mpg/performance on mine......just makes it sound better

keith_d · 26-07-10, 12:21 PM

I'm not an expert, so feel free to disregard my random mumblings...

The valve overlap (time when inlet and exhaust are both open) is chosen by the manufacture based on some assumptions about exhaust back-pressure. In theory, increasing the gas flow through the exhaust could pull fresh mixture straight through the cylinder and into the exhaust, which would affect fuel economy.

However, the baffle is a long way from the engine and doesn't make enough difference to the airflow. So removing it makes no practical difference to performance and economy. The only difference I noticed when I took mine out was a slight tendency to stall when pulling away at low revs. Easily cured by keeping the revs up a bit or leaving the baffle in after the MoT.

Just my thoughts,

Keith.

andrewsmith · 26-07-10, 02:52 PM

in theroy as the end can is for noise dampening it shouldn't have an adverse affect if its the right bore for the sv.

Stripping out the baffle will change the back pressure as the end can in effect becomes a expansion chamber (like on a 2 stroke) but should not have an adverse effect.

my stock exhaust's baffle has degraded with age and is effecting overall back pressure so requires removing or replaced!

26-07-10, 03:21 PM

you'll get approx 20 extra horse power and you'll be able to do 150 mph flat out with the baffel out,and you'll use more fuel because your able to go faster than ever.

I'm only kidding though- shouldn't make much difference but my bike feels as if it runs better with baffles in.

andrewsmith · 26-07-10, 03:30 PM

hijacking the thread

whats the signs of a kaput baffle?

26-07-10, 04:42 PM

I find mine gives better mpg with the baffles out and definitely sounds better

Wideboy · 26-07-10, 05:59 PM

Quote:

Originally Posted by andrewsmith

hijacking the thread

whats the signs of a kaput baffle?

......... it gets louder

26-07-10, 08:19 AM	#1
Telford_Tim Guest Posts: n/a	Will fitting a baffle affect performance? Have a scorpian can on sv, will taking the baffle out increase fule consumption and decrease performance?

26-07-10, 09:38 AM	#2
warrenhewitt10 Guest Posts: n/a	Re: Baffled.. no

26-07-10, 10:23 AM	#3
Biker Biggles Member Mega Poster Join Date: Jan 2005 Location: Barnet Herts Posts: 5,071	Re: Baffled.. Perhaps.Try looking in the Tuning and Tweaking section __________________ On a clear day we stand there and look further than the ordinary eye can see.

26-07-10, 11:09 AM	#4
metalhead19 Guest Posts: n/a	Re: Baffled.. Hasnt made any difference to mpg/performance on mine......just makes it sound better

26-07-10, 12:21 PM	#5
keith_d Member Mega Poster Join Date: Feb 2009 Location: Ruislip Posts: 1,131	Re: Baffled.. I'm not an expert, so feel free to disregard my random mumblings... The valve overlap (time when inlet and exhaust are both open) is chosen by the manufacture based on some assumptions about exhaust back-pressure. In theory, increasing the gas flow through the exhaust could pull fresh mixture straight through the cylinder and into the exhaust, which would affect fuel economy. However, the baffle is a long way from the engine and doesn't make enough difference to the airflow. So removing it makes no practical difference to performance and economy. The only difference I noticed when I took mine out was a slight tendency to stall when pulling away at low revs. Easily cured by keeping the revs up a bit or leaving the baffle in after the MoT. Just my thoughts, Keith.

26-07-10, 02:52 PM	#6
andrewsmith Member Mega Poster Join Date: Apr 2010 Location: Newcastle upon Tyne, Just south of salad dodging country Posts: 7,750	Re: Baffled.. in theroy as the end can is for noise dampening it shouldn't have an adverse affect if its the right bore for the sv. Stripping out the baffle will change the back pressure as the end can in effect becomes a expansion chamber (like on a 2 stroke) but should not have an adverse effect. my stock exhaust's baffle has degraded with age and is effecting overall back pressure so requires removing or replaced! __________________ RIP Reeder 20/07/1988 - 21/03/2012. Always missed squire!!! Every year we meet old friends, gain some new ones, lose old ones and you always remember them all. “Live as if you were to die tomorrow. Learn as if you were to live forever.” Mahatma Gandhi

26-07-10, 03:21 PM	#7
husky03 Guest Posts: n/a	Re: Baffled.. you'll get approx 20 extra horse power and you'll be able to do 150 mph flat out with the baffel out,and you'll use more fuel because your able to go faster than ever. I'm only kidding though- shouldn't make much difference but my bike feels as if it runs better with baffles in.

26-07-10, 03:30 PM	#8
andrewsmith Member Mega Poster Join Date: Apr 2010 Location: Newcastle upon Tyne, Just south of salad dodging country Posts: 7,750	Re: Baffled.. hijacking the thread whats the signs of a kaput baffle? __________________ RIP Reeder 20/07/1988 - 21/03/2012. Always missed squire!!! Every year we meet old friends, gain some new ones, lose old ones and you always remember them all. “Live as if you were to die tomorrow. Learn as if you were to live forever.” Mahatma Gandhi

26-07-10, 04:42 PM	#9
MR UKI (1) Guest Posts: n/a	Re: Baffled.. I find mine gives better mpg with the baffles out and definitely sounds better

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