2000 Rover MPI - exhaust popping and cracking

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RS - 23 Jul 2006 21:08 GMT

Evening all,
after fitting a RC40, i noticed a quiet popping on over-run, ie if i blip
the throttle between changing from 3rd to 2nd etc, on taking up 2nd gear the
exhaust pops, bangs and cracks for a second or so. Ive recently fitted a
K&N induction kit - ie a big cone filter not unlike carb models. since
this, the cracks and pops have become louder and last for up to 2 secs on
change downs etc. Personally i think its really cool, but is it having a
detrimental effect on my engine at all?

thanks
RS

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Barspeed and his magical Mini's - 24 Jul 2006 01:11 GMT

I have had this on my 2001 Classic Mini 7 since i fitted a bolt on RC40, it
reminds me very much of when i had a suped up morris minor 1100, this i
think is ok, have been running it for over a year now like this and has had
no effect on the engine, i definatly found an increase in performance
though.
Must be the gases being chucked around the silencer, the original late model
Minis had huge rear silencers and a average size middle one, the RC40
generally is just one silencer, so lots of gas bouncing around!!! lol

> Evening all,
> after fitting a RC40, i noticed a quiet popping on over-run, ie if i blip
[quoted text clipped - 7 lines]
> thanks
> RS

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Fitzy - 24 Jul 2006 09:38 GMT

I think your right there Jono,
sounds like the unburnt fuel in the exhaust system is exploded by the heat
from the front pipes,
Fitzy

>I have had this on my 2001 Classic Mini 7 since i fitted a bolt on RC40, it
>reminds me very much of when i had a suped up morris minor 1100, this i
[quoted text clipped - 16 lines]
>> thanks
>> RS

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Taffy - 24 Jul 2006 13:03 GMT

Well i've always fitted Maniflow exhaust products and i've never had
that problem, mind you i've always fitted twin-box exhausts.

Taffy

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