Crackling exhaust volume

[Tacchino]

Anyone got a logical explanation of why my Cerbs exhaust noise changes between hot sunny days and cooler evenings/mornings.

On a nice hot day (like yesterday) she sounded like a squadron of angry Lancasters on a high intensity bombing run.
Every time you come off the gas it was like a rapid firing heavy cannon!

Went out again in the evening and we're back to the more normal small arms fire.

This morning she's still in "normal" mode.

Any clues as to why it changes so much?

[scotty_d]

I take it you mean pops and bangs on over run? It might just be when the exhaust gets really hot. I Notice mine is very angry when i have been sat in heavy traffic then get some clear road the car is nice and toasty with heat soak through the exhaust

[Tanguero]

Heat soak in the exhaust, air density, relative humidity?

[prettyboyben]

I always assumed that it was the exhausts expanding and so just generally being louder and accentuating all those lovely pops and bangs. I need to get my chimaera to make some of that noise!!! Haha!

[Tacchino]

prettyboyben said:

I always assumed that it was the exhausts expanding and so just generally being louder and accentuating all those lovely pops and bangs. I need to get my chimaera to make some of that noise!!! Haha!

Better fit an AJP8 engine then

[pjac67]

Tacchino said:

prettyboyben said:

I always assumed that it was the exhausts expanding and so just generally being louder and accentuating all those lovely pops and bangs. I need to get my chimaera to make some of that noise!!! Haha!

Better fit an AJP8 engine then

No need for that

[tejr]

On a hot humid day the exhausts pop like theres no tomorrow.. from a cold winter start they are quite quiet to begin with and get louder as they warm...

I always put it down to the slight expansion of the exhausts and hotter gases travelling at higher velocity (which = louder) and being more a more volatile exhaust mixture when hot

Edited by tejr on Thursday 24th May 11:13

[Tanguero]

I wonder what difference the ambient temperature makes to the fueling? If the ECU enriches it at higher ambient temperature that would explain it.

[Mark.]

Seems I might have found different.

Cold crisp days, warm engine she sounds like Armageddon, on warmer days there seem to be less pops and bangs, but still enough to make children cry

[scotty_d]

prettyboyben said:

I always assumed that it was the exhausts expanding and so just generally being louder and accentuating all those lovely pops and bangs. I need to get my chimaera to make some of that noise!!! Haha!

Run it on 101 ron fuel it will sure Pop and bang away if your exhaust has been sleeved Not quite as good as a cerb but can give it a run for it's money.

[camel_landy]

Tacchino said:

Anyone got a logical explanation of why my Cerbs exhaust noise changes between hot sunny days and cooler evenings/mornings.

On a nice hot day (like yesterday) she sounded like a squadron of angry Lancasters on a high intensity bombing run.
Every time you come off the gas it was like a rapid firing heavy cannon!

Went out again in the evening and we're back to the more normal small arms fire.

This morning she's still in "normal" mode.

Any clues as to why it changes so much?

Your Lambda sensors are knackerd...

M

[Pursyluv]

Can 101 ron be bought on the forecourt?

[chibbard]

Haha, i nearly made somebody drop their mobile phone they had next to their ear once.