Fuel exhaust baffle out, increase power?

[flimbar]

Will taking the baffle out of my Fuel exhaust increase the power or just the noise level?

I am trying to get insurance sorted and they are fine with an exhaust that is just cosmetic and doesn't increase the power and I asked if I would still be covered if I rode it with the baffle out and they are asking what difference that makes. I told them it just makes it louder, they said they'd get back to me. Is what I told them correct?

I'm not keen on just telling them it is road legal and then riding it with the baffle out... got visions of being in a smash and bike is taken away before I can put the baffle back in and the insurance won't pay out for 3rd party damage because they found my exhaust to be non road-legal. I don't need that stress, I'd rather just keep the baffle in, but if I can get them to cover it then I will.

[G]

Doesnt really, you can even loose some power at different rev ranges.

With my old exhaust with all baffles out I swear the bike didnt pull as hard than with one of the baffles in.

If you loose to much back pressure on an N/a motor you will actually loose power, so it depends.

[sv_rider1990]

Na you should'nt by law be riding with out your baffle as it is for "track use only" . The baffle is there to quieten down the can to be within the certain decibel level... it could also be an MOT failure.

At the end of the day its your insurance and your license but personally i wouldnt have even told them about riding with out your baffle in as you could now perhaps of made a problem with your insurance - i am only guessing.

Keep it in the SV sounds good even with the stock system if thats what you have an SV?

Ash

[Paul the 6th]

riding without the baffle is £30 fine if the police have nothing better to do. Loads of people on here say they ride without them (some also actively encourage others to do the same lol)...it's not a such a serious offence... but you are drawing unwanted attention to yourself so it's kind of a personal preference.

Since the catalytic converter is actually in the standard can itself, replacing the stock can with an aftermarket item removes the cat altogether. This is enough to make the sv sound immense - the baffle doesn't seem to make a massive difference to mine so I just leave it in :)

[Alpinestarhero]

Dosnt do anything really, although I noticed on my restricted curvy the fuelling has been better. before, with the standard exhaust (well, road legal remus), i sometimes got a bit of hesitation at around 4000 rpm; this has gone now

Matt

[flimbar]

Thanks for the replies. The insurance (MCE) said they'd cover me for riding with the baffle out so I have the option of trying both and only have to worry about the cops and not financial ruin if something catastrophic happens involving a 3rd party.

[kwak zzr]

id say yea it doesn't do much BUT ride with it out for a few months then stick it back in! u can feel a difference, my k3 used to feel suffocated.

[yorkie_chris]

If you loose to much back pressure on an N/a motor you will actually loose power, so it depends.

Not exactly, with a lot of overlap on the cams you can lose a lot of bottom-end with less back pressure. Hence the creation of yams EXUP valves to give backpressure at low revs and make a quite highly strung engine more tractable at low rpm.

ANyway a slipon alone will not give you any more power.

The proper thing to say to insurance is an "aftermarket exhaust which does not increase performance"

svrider1990 what are you on about mate the standard can makes the engine sound like a sewing machine. :-P

[Dangerous Dave]

Not exactly, with a lot of overlap on the cams you can lose a lot of bottom-end with less back pressure. Hence the creation of yams EXUP valves to give backpressure at low revs and make a quite highly strung engine more tractable at low rpm.
+ 1

Anyway a slipon alone will not give you any more power.
+ 1, a slip on can does not increase the power on an SV despite what exhaust manufacturers claim whether with baffle in or baffle out!

[sv_rider1990]

Not exactly, with a lot of overlap on the cams you can lose a lot of bottom-end with less back pressure. Hence the creation of yams EXUP valves to give backpressure at low revs and make a quite highly strung engine more tractable at low rpm.

ANyway a slipon alone will not give you any more power.

The proper thing to say to insurance is an "aftermarket exhaust which does not increase performance"

svrider1990 what are you on about mate the standard can makes the engine sound like a sewing machine. :-P

LMAO

[Paul the 6th]

I decided to do a scientific experiment... just been for a blast with baffles out for the first time - only put the can on 2 weeks ago and have ridden with baffles in ever since. I can report there was no marked increase in power or acceleration, if anything it possibly even felt slightly less rapid when accelerating hard in 1st and 2nd... wasn't sure though.

The only other thing I noticed was lots more popping when coming down the rev range/slowing down. I only get a slight pop every now and again with the baffles in so I'm assuming the baffle stops too much unburnt fuel being pulled through the engine.

to sum up, I'll be putting my baffle back in because I'd rather avoid a possible 30 quid fine and although I love the popping, I can do without...

that is all :)

[flimbar]

So you didn't notice any volume increase with accelerating?

[yorkie_chris]

Mine was always loads louder with the baffle out, that's kinda the idea :-P

I can see there being a possible power gain by removing the baffle, but you've got to set the fuelling up to any "breathing" change to get the advantage.