Making the exhaust go BANG!!! Bad for the engine?

[thor]

I can now reliably cause the exhaust to go BANG! on my pointy in third gear at town cruising speeds. I just can't help myself and do it 4 or 5 times each way on my commute of just 3 miles. I know it's probably bad for the packing (what packing? ;)) but is it bad for the engine? Please say no because I love doing it!

Jeez, I get on that bike and I'm a complete hooligan.:smt046

[Brian]

Not sure about engine damage mate, but I do know you'll be doing your exhaust/can no favours (which you already know).
If you have a carbon can, then it may start falling apart or just explode lol.

[Sideshow#36]

Nah shouldnt do any damage. All you are doing is burning off excess fuel. The only bad thing its doing in my opinion is reducing your fuel economy. And who really cares about that...:rolleyes:

[thor]

I only get 90 to the tank in town anyway.

My god I got a good one the other day, right next to some pedestrians waiting to cross. You have to lurch it forward in third, about 25mph, and they all turned to look at the loud bike. As I went past

BANG!

I was laughing in my lid for ages!:smt043

[Steve_God]

It's good ain't it! :D

I can do the same... Although mine used to be REALLY bad when I first put my Renegade system on, partly due to it still being on standard fueling (and it being a straight through can) and also as there was LOTS of areas blowing where I hadn't sealed it properly :rolleyes: - You'd get 'pop, pop, pop BANG' with it being 3 small blue flames, followed by a good footlong yellow flame! Amazing, but I knew that wasn't a good thing long term...

I took it to my nearest tuning place (Rhencullen) and they did a 'Yoshi' edit to the ECU to sort out the fuelling, and said that although it wasn't perfect (it could only do +/- 5% change on different areas without paying huge amounts, it was enough to bring it back in line so that there would be no damage being caused to the engine.

Since then, it still gets a few pops, but VERY rarely I occasionally get a big bang... always makes me chuckle! :cheers:

[G]

Mine hardly ever pop and never BANGS.

If I rev high and then let the revs drop, it will let out a very little pop around 3/4krpm but thats its, and even those tiny little pops I'm convinced are due to it not having a 100% seal on one of the joints....I feel like i have been cheated:(

[TheStudent]

How do you do it?

[thor]

As above, but I have a hindle full system, a sv1000 snorkel and a remap.

[Sosha]

Used to be able to detonate mine to order..... had it remapped last week - it'll still give a decent pop (though not to the same car alarm/ window shattering extent) on the overun but it's now possible to shut it up when you need to. Also seems better at around 5.5k or so...

All in all a good thing really...

(Boring but effective Micron Full system)

[tactcom7]

How do you do it?

Dunno about everyone else but i simply rev it a little then flick the kill switch off n on at the same time really quickly (just once mind).

Looks great in the dark! :)

[G]

LOL i used to do this with my first car which was a 205 GT. The car had a hard life and died an early death due to engine trouble.

I cant imagine it did the engine any good.

[yorkie_chris]

My mangled can leaks a bit of air so it pops quite a bit on the overrun, love it outside the uni, students are a lot like lemmings crossing the road so I tend to be a total hooligan, always gives me a good laugh :D

[thor]

Dunno about everyone else but i simply rev it a little then flick the kill switch off n on at the same time really quickly (just once mind).

Looks great in the dark! :)


Yeah but you can't do that on the pointies because the fuel injection cuts off the fuel.

[hovis]

flick the kill switch on & off:smt045
dunno if it does any damage, dont blame me if it does though

best to do it while you are statanary, although i quite liked doing it in bryn glas tunnels:smt077

[cyphertheory]

you can do the old kill switch trick on a pointy i assure you :cool:

sounds great on my cut down dual port exhaust :D and always good for a nice little flame or two

[thor]

you can do the old kill switch trick on a pointy i assure you :cool:

*grabs keys*

[plowsie]

When my RR was playing up if you put full beams on the thing would cut out just like the kill switch trick, on a non lit A road at 3 in the morning it lit behind me up lol.

[ianofbhills]

i think most pointys with an aftermarket exhaust will pop and bang no matter what has been done to the fueling this is because of the PAIR system.

mine used to reliably pop on the overrun in 3rd gear at 3-4k rpm but since removing the PAIR it no longer does.

[yorkie_chris]

Why remove it? I think the overrun popping is pretty cool

[Draper]

so does knowone know whether it does engine damage?

it does sound rather awsome i have to say, flame and all

[yorkie_chris]

Well unless there is some back current going through the electrics as everything is switched off (which I imagine is accounted for in the design in case the killswitch is actually used to turn the engine off) I don't think so.
With a race can I doubt there is enough backpressure developed to do damage, though this could be a great way to remove the baffle without using pliers :cool:

Some may say that a misfire will "wash the bores of oil" or whatever, but I don't believe that theory, as its an instant thing on an engine at operating temperature.

So no, I don't believe it does any harm

[Steve_God]

i think most pointys with an aftermarket exhaust will pop and bang no matter what has been done to the fueling this is because of the PAIR system.
Possibly a dumb question, but what's the 'PAIR' system?

[chris8886]

another possibly "dumb" question. how exactly do you do the kill switch thing? do you have to be giving it some revs when you flick the switch and then hit the start button with the clutch in? or what exactly?

thanks

[hovis]

another possibly "dumb" question. how exactly do you do the kill switch thing? do you have to be giving it some revs when you flick the switch and then hit the start button with the clutch in? ?

thanks

close .....as above but no need to hit the start button, just flick kill switch off & on

but try it while the bike is out of gear & stoped, as the above is a bit dangerous IMO

[rob13]

Thor how were you doing it without the Kill switch? Mine regularly pops on the overrun but rarely bangs

[ianofbhills]

Possibly a dumb question, but what's the 'PAIR' system?

copied and pasted from chewys-stuff website that sells the removal kits


The pair system feeds air into the exhaust to aid in the combustion of unused fuel. The system was designed to improved emissions. The problem it causes is when using race cans or many aftermarket cans you can get a lot of popping through the exhaust and occasional backfire through the air box. The elimination of the system will fix this problem

[Smudge]

copied and pasted from chewys-stuff website that sells the removal kits


The pair system feeds air into the exhaust to aid in the combustion of unused fuel. The system was designed to improved emissions. The problem it causes is when using race cans or many aftermarket cans you can get a lot of popping through the exhaust and occasional backfire through the air box. The elimination of the system will fix this problem
so how can we eliminate the pair system

[ianofbhills]

you can buy a removal kit from chewy or you can block up the pipe that bleeds the air back into the exhaust

pair removal kit here http://www.chewys-stuff.co.uk/

[yorkie_chris]

occasional backfire through the air box.
Doubt it.

You can rip the system off yourself as I understand it, but this puts the FI warning on, chewys system fools the ECU into thinking it still works.
I'd go for removing the pipe, if I didnt have the good sense to have something with carbs on it.