FIRE! Flaming awesome or burning out?

[Jynx]

I have been trying to Google/forum search this issue but not finding many decent answers.

Since taking out the removable baffle from my after market can I have noticed a nice popping noise on decel and dropping through gears, which until recently hasn't bothered me. However the other night a guy from work followed me home on his GSXR and told me that each time it pops there is a nice blue flame to go with it!

This is happening fairly regularly apparently.

So other than the fact that it's seriously cool and will probably make the cagers give me more room when I'm filtering :), is there anything I need to do about it?

I have read that this type of flame (colour and time it occurs) could indicate a leak in the exhaust system?

Anyone know for sure, or is this just something to be expected with a less restrictive exhaust on the SV?

After market can is the only tweak (engine wise) on the bike. Pointy K4.

Thanks,

Jynx

[Dicky Ticker]

Only excess fuel on the over run igniting in the exhaust
I think it was Coolgirl's bike that was famous for this

Very impressive;)

[Joeskeppi]

What aftermarket is it? I don't know how to fix it, I just want one ;)

[Owenski]

What aftermarket is it? I don't know how to fix it, I just want one ;)

lol quality answer.

[Chandler93]

What aftermarket is it? I don't know how to fix it, I just want one ;)

It would be ironic if it was a Blue Flame can... :cool:

[mikerj]

The injected engine has a PAIR system that injects air into the exhaust to lower emissions. This is well known for causing popping and banging on the overrun. Nothing to worry about, though it can be blanked off if you want.

[mister c]

I have gone back onto std cans on the thou for that same reason, looks good, but I think that it might attract certain people to giving me a £30 fine or take a chance

[Whyte25]

I have this on my curvy - and love it ! could it be running to rich ?

[andrewsmith]

I have gone back onto std cans on the thou for that same reason, looks good, but I think that it might attract certain people to giving me a £30 fine or take a chance

U mean a twin pipe flame thrower. How long did they last?

Mikerj probably right about the pair system, good chance that its helping it to happen.
I think barwel1992 has had similar on his K3 (well was a K3 once upon a time :p)

[barwel1992]

U mean a twin pipe flame thrower. How long did they last?

Mikerj probably right about the pair system, good chance that its helping it to happen.
I think barwel1992 has had similar on his K3 (well was a K3 once upon a time :p)

lol

yeh i removed the pair system

but it still bangs every now and again (proper bang though not the small ones you get with the pair system)

[Paul the 6th]

I've seen an audi s4 which was designed to significantly over fuel on the over run to cool the piston crowns - this caused 12" flames to fire out of the back of it.

Used to get banging on my pointy 650 (not sure about flames) but I think it's just down to unused fuel getting through the system and when there's the right balance of heat/unburnt fuel/air introduced, the conditions are right for the fuel to ignite? Sure someone like embee or YC will be along with some equations to explain how & why it happens but that's my guess :)

[Reeder]

Mine only really does it at about 4.5k rpm in third gear :(

[barwel1992]

Mine only really does it at about 4.5k rpm in third gear :(

accelerating ? or just on overrun

if its at 4.5rpm is prob's over fuelling at that point in the rev range mine does it at 5k theres also a flat spot there when accelerating

[Jynx]

Cheers for all the suggestions and comments.

It does seem to happen more around the 3-5k rpm mark and as mentioned above, there is a flat spot around there (or it just there is a power jump @ 6k rpm?).

It's a Beowulf exhaust - I'm afraid I have no idea on model as it was fitted by BlueWolf (previous owner).

Also I'm planning to borrow my mates gopro tomorrow to take a video for all who are interested :D

EDIT: Exhaust is actually a Remus!

[Reeder]

Only on the over run, and it doesn't happen massively often. It's only a few times each ride.

[barwel1992]

Cheers for all the suggestions and comments.

It does seem to happen more around the 3-5k rpm mark and as mentioned above, there is a flat spot around there (or it just there is a power jump @ 6k rpm?).

It's a Beowulf exhaust - I'm afraid I have no idea on model as it was fitted by BlueWolf (previous owner).

Also I'm planning to borrow my mates gopro tomorrow to take a video for all who are interested :D

the 5k dip is for emitions and apparently its a fueling blip (about 10th hand info there :p )

Only on the over run, and it doesn't happen massively often. It's only a few times each ride.

yeh almost like the fuel builds up ignites then the fuel builds up again then ignites again

[Reeder]

So if it's not doing it at any other time then perhaps my pair thing is blocked off or removed?

[Jynx]

the 5k dip is for emitions and apparently its a fueling blip (about 10th hand info there :p )

Is this the thing I could stop by removing the 2nd and 3rd gear wires? I *think* the problem still happens in 4th...

[toxic]

This isn't fair, my SV never pops and bangs like that. You'd think with a full system it'd do it more?

[barwel1992]

So if it's not doing it at any other time then perhaps my pair thing is blocked off or removed?

doubt it :/

[Reeder]

Care to explain why...

[Radlad]

Interesting how this thread started with someone worried about his SV kicking out flames, and now others want it!!! I have a blue flame can, but no flame, only very satisfying popping.

[Stonesie]

I get plenty of popping on mine on over run between 3-4.5k, I can hear it with earplugs in so there might be a hint of flame there but either way I like it like that.

[barwel1992]

Care to explain why...

because most people like the popping so there's no reason to get rid of the pair system or block it

i removed mine because i wanted to

[mikerj]

Aside from the PAIR system, popping and flames are more often caused by weak mixtures, not rich.

[Goldy]

sorry to sound dim, but whats a pair system?

[barwel1992]

Aside from the PAIR system, popping and flames are more often caused by weak mixtures, not rich.

how so ? if the mixture is week then there would be a lack of fuel meaning no ignition of fuel (flames) if its rich the excess fuel passes in to the exhaust gets ignited by the heat and air in the exhaust ?

[slinky]

Bhahaha - I've done the same recently and getting the same results! Was going to post, it's cool isn't it!!

[tom-k6]

i get it tooo!!! i have seen it by tilting my mirror down so i can see the end of my exhaust, it does some really loud ones when the engine is cold, but still pops and bangs when hot, just not as much.

and as some others have said, its usually at 4.5 to 4K rpm and in third gear,

not sure if it flamed with the beowulf on it but i bought an ART race can off a guy on here and that makes some HUGE blue flames :)

[SVMAT]

My pointy does it 2 :cool:, i have blueflame twin oval exhaust without baffles. Also got a green cotton filter if that makes a dif. I always thought this was the norm on bike upon deceleration, under engine braking. If you wanna be even cooler you can flip ignition on/off when reving it to shoot a flame too lmao.
Not sure how good this is for the bike though.

[Jynx]

Glad to see I'm not alone, will do a video tomorrow :)

I also feel I should correct myself, it's not a Beowulf can, it's a Remus!

[mikerj]

how so ? if the mixture is week then there would be a lack of fuel meaning no ignition of fuel (flames) if its rich the excess fuel passes in to the exhaust gets ignited by the heat and air in the exhaust ?

Because weak mixtures burn slowly, so it can still be burning well after the exhaust stroke has finished. This is how you get an backfire through the carb/throttle body, because the mixture can still be burning when the inlet valve starts opening.

[hardhat_harry]

Mine does this too after fitting the pointy cams

[mikerj]

sorry to sound dim, but whats a pair system?

PAIR is a Suzuki acronym for "Pulsed AIR" Injection. It bleeds air into the exhaust near the ports to enable more complete combustion of exhaust gasses to meet emissions regulations.