back fire?

[B20]

hi pple...

 

cut-off engine while doing a very high rev... causing a "POP" sound wif some sparks or fire in the exhuast awhile suddenly on back the engine...

 

anyone can tell mi the theory of this "back fire"????

does it really stress or hurt ur piston or watever???

 

i had been addicted to it n keep POPing at other vehical on the rd...

[d0n]

yes

it is very capable of hurting yr engine parts especially the piston

do it more and be prepared to spend $$ to change piston

 

tink basically a larger amt of fuel is deposited into the cylinder when u twisted the throttle but it doesnt get combusted completely due to engine being subsequently cut off. when u restart the engine, this previously uncombusted fuel suddenly gets ignited and an abnormal explosion happens in the cylinder causng the pop sound

 

why do u wan to backfire at other vehicles on the road? i'm concerned abt the disturbance caused to other innocent parties who happen to be ard u as well

[Tourer]

Haha... Alex, almost anything that is not intended to be done on the motorcycle is harmful/detrimental to the bike.

 

dOn^ is correct. The uncombusted fuel is being pushed out into the exhaust valves and remains on the exhaust pipe until air is being sucked in again and combusted by the next available ignition. It's capable of damaging your engine parts but I don't think it's the pistons though, most likely it's the exhaust valves and your exhaust seal gaskets.

 

Backfires not only forces combustion/explosion out into the direction of the exhaust pipe, but the combustion also blasts the pressure back into the engine. So on the next round of available ignition, the back blast will ram pressure back into your exhaust valves, and also causing back-pressure on both the exposed combustion chamber and valve wall. Just analyse how the engine works and you will draw the image of what are the potential engine damages.

[paiseh]

backfire is shiok. hear the sound, see the fire, can clear carbon.

[vfrT]

Originally posted by al3ex@January 21, 2007 07:28 am

i had been addicted to it n keep POPing at other vehical on the rd...

... and we wonder why others frown on bikers.

Doing this is no-brainer and anyone can do it. The problem is that in a public place the noise generated gives bikers a bad name. The response u get from the general public is not admiration but something much less flattering. Save this infantile addiction for a closed environment such as the track.

cheers.

[aRcHeR]

thought only 4 pipes to 1 pipe then can?

 

and engine cut-off, do you mean kill switch or juz bipping the throttle? open close open close..

[B20]

Originally posted by vfrT@January 22, 2007 10:10 pm

Save this infantile addiction for a closed environment such as the track.

cheers.

yeah.. . . . CTE tunnel is my favourite spot...

[Tourer]

Originally posted by aRcHeR@January 22, 2007 11:48 pm

thought only 4 pipes to 1 pipe then can?

 

and engine cut-off, do you mean kill switch or juz bipping the throttle? open close open close..

He's referring to "Kill" switch. Nope, any kind of setup also can.

[B20]

anyway.. . . .. ya la... shld stop all these... every "POP", my heart pain. .. . .

[aRcHeR]

Originally posted by tourer84@January 23, 2007 02:06 am

He's referring to "Kill" switch. Nope, any kind of setup also can.

roger that.. but bipping the throttle oso can rite? not neccessary to use the kill switch..

[paiseh]

kill switch can do backfire more effectively. u can control whenever u wan the fire to appear - shiok

[Benny 10]

Originally posted by vfrT@January 22, 2007 10:10 pm

... and we wonder why others frown on bikers.

Doing this is no-brainer and anyone can do it. The problem is that in a public place the noise generated gives bikers a bad name. The response u get from the general public is not admiration but something much less flattering. Save this infantile addiction for a closed environment such as the track.

cheers.

yaya. got a point. but last time i also used to doin it, fun wat.. haha

 

but wonder if anyone can say such a thing to de harley gang, they're backfiring everywhere.. haiz.. just cos they're CEOs and directors and chairmans den they can... ... .. ... ...

[shiraz]

Originally posted by Benny 10@January 23, 2007 11:24 am

yaya. got a point. but last time i also used to doin it, fun wat.. haha

 

but wonder if anyone can say such a thing to de harley gang, they're backfiring everywhere.. haiz.. just cos they're CEOs and directors and chairmans den they can... ... .. ... ...

since when are harleys ALLOWED to backfire?!

[ulysses_sc]

Originally posted by Benny 10@January 23, 2007 11:24 am

yaya. got a point. but last time i also used to doin it, fun wat.. haha

 

but wonder if anyone can say such a thing to de harley gang, they're backfiring everywhere.. haiz.. just cos they're CEOs and directors and chairmans den they can... ... .. ... ...

Dude, Harleys backfire because their air/fuel mixture is lean (most probably). The bike will backfire if they close throttle from mid or wide open. The only way to solve this is by jetting the bike correctly.

 

Backfire can also occur if the jetting is too rich (actually this is known as after fire), or have leaky exhaust gaskets.

 

This is very different from folks who purposely use the ignition cut-off switch to induce a backfire. These riders are more of a public nuisance.

[Benny 10]

everytime i see them in big groups den all de firing begin liao.. during de big bike fest there, like war-zone..:giddy:haha.. a few times i was prepared, but sometimes really damn loud... wonder if it does any harm to de engine? and y are they keeping on doin it..

[-dUde]

how to do!!!teach me!!! mus at high speed uh?? try try at 2nd gear high rev can??close while holdin e throttle or close it first?but my sp took out e engine kill switch le...turn off by key can?

[natgw]

only applicable to 4stroke bikes. why would u wanna know how to do it anyways.

[rhema83]

Originally posted by -dUde@January 23, 2007 10:29 pm

how to do!!!teach me!!! mus at high speed uh?? try try at 2nd gear high rev can??close while holdin e throttle or close it first?but my sp took out e engine kill switch le...turn off by key can?

You will seriously damage your engine. Don't turn off the key. You might even crash.

 

I have no clue why people want to backfire. It is a serious nuisance. If my bike backfires, I bring it to my mechanic to fix the tuning so that it doesn't do it!

[redders]

EVER HEARD HARLEY DOES A BACKFIRE... ITS SCREAMING LOUD BABY...

[three]

Originally posted by -dUde@January 23, 2007 10:29 pm

how to do!!!teach me!!! mus at high speed uh?? try try at 2nd gear high rev can??close while holdin e throttle or close it first?but my sp took out e engine kill switch le...turn off by key can?

Are you nuts?? Don't do it.. only 4 stoke bikes can backfire.

[redders]

Originally posted by tbr27@January 24, 2007 07:28 pm

Are you nuts?? Don't do it.. only 4 stoke bikes can backfire.

yeah.. nonsense arr..

try join the moto gp den no need to backfire..hear the bike on throttle oredi siao liao

[B20]

Originally posted by -dUde@January 23, 2007 10:29 pm

how to do!!!teach me!!! mus at high speed uh?? try try at 2nd gear high rev can??close while holdin e throttle or close it first?but my sp took out e engine kill switch le...turn off by key can?

after so many negetive comments u still wanna try ar?? metal teeth eh...

[-dUde]

its juz like...wantin to experience it thts all..aite aite...nt for 2 strokers den...i shall forget bout it..thanks for e advice

[redders]

dats seems sensible..at last..phew!!!

[Guest czh2002sg]

IMHO, use your bike as it is meant for. Enjoy your ride, enjoy the sights. Try funny things on it and you may regret. Sounds like common sense? It is. Just my $0.02 worth..