What causes the exhaust Pop on Acceleration

RD16RR · May 2, 2017

6 to 8k rpm shifts now get an exhaust pop/bang...rather regularly....not that im complaining...but....."whats up with that" ?

RetardedTiming · May 2, 2017

Mine does the same. Usually when I'm stuck behind traffic then it clears and I get on the gas to pass. Suspect it's just loaded up.

I kind of like it because it usually does it as I'm passing the slow lead car and shifting. Kind of a middle finger of sorts to wake the .... up you have a line of cars behind you.

DP race map/full Akra here.

Twistedracer · May 2, 2017

If your using the quickshifter it's the ignition cut and igniting the fuel in the exhaust as the ignition comes back on.

Phl · May 2, 2017

Twistedracer said:
If your using the quickshifter it's the ignition cut and igniting the fuel in the exhaust as the ignition comes back on.

^this!

maska321 · May 2, 2017

Got the same and love it. Quite similar sound to my previous S1000RR.

Kevin1199 · May 2, 2017

Twistedracer said:
If your using the quickshifter it's the ignition cut and igniting the fuel in the exhaust as the ignition comes back on.

nailed it

Twistedracer · May 2, 2017

In my younger years with our carby bikes, we'd pass our friends and hit our kill switch while leaving our throttles open. We'd get a massive bang when we flipped it back on. Looking loads of fun.

RD16RR · May 2, 2017

Phl said:
^this!

...thank you...and yes, understood....it struck me as odd since, it used to happen occasionally, not on just about every shift...

Twistedracer · May 2, 2017

RD16RR said:
...thank you...and yes, understood....it struck me as odd since, it used to happen occasionally, not on just about every shift...

I've found how lazy or quickly you shift makes a difference. A lazy shift should result in more of a pop because of a longer cut.

Marmoot · May 2, 2017

I'm wondering if backfire like that would create sudden backpressure that impacts badly on the exhaust valves overtime? Is it bad?
Mine does that regularly too and I'm liking it. But sometimes I'm worried this might be akin to liking deep fried food?

maska321 · May 3, 2017

Marmoot said:
I'm wondering if backfire like that would create sudden backpressure that impacts badly on the exhaust valves overtime? Is it bad?
Mine does that regularly too and I'm liking it. But sometimes I'm worried this might be akin to liking deep fried food?

good question...

biglipps66 · May 3, 2017

twistedracer said:
in my younger years with our carby bikes, we'd pass our friends and hit our kill switch while leaving our throttles open. We'd get a massive bang when we flipped it back on. Looking loads of fun.

^ this!!!

JonT · May 11, 2017

I find that this is more pronounced if I short shift, not sure what that means, just an observation.

bradp51 · May 11, 2017

How much pressure do you think is against the valves during the firing cycle

Mutt1979 · May 11, 2017

bradp51 said:
How much pressure do you think is against the valves during the firing cycle

But they are held in due to their shape and outlet size they won't physically blow out......... a bit of back pressure in an open ended system may blow a valve into the cylinder

Marmoot · May 12, 2017

bradp51 said:
How much pressure do you think is against the valves during the firing cycle

During the compression and firing, the pressure would press against the valve resting on the valve seat. But a backpressure from exhaust exaggerated by backfire would press the valve head without it resting againdt anything. That means the valve stem would be experiencing a stretching tension, one by valve head being pressed towards the cylinder and another by the valve head pulling the valve closed. I wonder what the impact of that is...

What causes the exhaust Pop on Acceleration

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