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m4rtys
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Annoying Rattle / Rasp Noise from exhaust?
« Thread Started on Aug 31, 2006, 9:01pm »
Help!!!

I have a Janspeed exhaust fitted with decat, and also have a vader induction.

When stationary the exhaust sounds loud but at the drop off of acceleration you can here a rattle / rasp / vibration noise.

And when driving the noise is very much more noticeable.

I have had it up on ramps tonight to investigate.

Firstly i noticed that some of the braiding on the flexi section had come away from the end closest to the front of the car - so i placed a jubilee clip round and tightened. tried the car but noise was still present.

Secondly i noticed that the exhaust strap bracket that attachs at the end of the decat was cracked and broken so iremoved this and the strap - tried car but noise stil present.

i have checked all the exhaust heat shield which also has the stainless cover on but see any fault here.

Have looked at the oil filler bracket and although it doesn;t seem perfect i don't think it could make the noise i am hearing.

The noise was there when i bought the car but not as bad! it seems to have got worse since i fitted the decat.

The funny thing is i used to have a P reg VVC which had the same set up other than the exhaust was a janspeed MS daytona.
This car also had exactly the same noise and i could never work out what it was.

I took it over to see Andy Phillips and we agreed it was induction noise from the Vader, however when i sold the car i returned it back to standard and the noise was still there.
The only thing i never changed was the front flexi section? so maybe this is the fault but the one on my car at the moment doesn;t look that bad?? and seems expensive to change on the off chance it may cure the noise.

Has anybody else experienced this? or does anybody have any ideas what it could be?

Cheers

Martin
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Re: Annoying Rattle / Rasp Noise from exhaust?
« Reply #1 on Aug 31, 2006, 9:26pm »
sounds like the flexi to me as they break up inside - although i think stu had it changed if my memory serves me correct !!!

I would personally use it an excuse to get 4-2-1 manifold though ;D ;D ;D -help to release a few more horses

re the bracket round the back box i removed mine as it broke and haven not had one on the car for years now as i cant see any point in it

D
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Tony Williams
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Re: Annoying Rattle / Rasp Noise from exhaust?
« Reply #2 on Aug 31, 2006, 11:18pm »
I've just had a similar problem, it was a combination of a damaged flexi and a hole in the exhaust where the welding broke.
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Re: Annoying Rattle / Rasp Noise from exhaust?
« Reply #3 on Sept 1, 2006, 6:30am »
Tony,

Have you replaced the flexi yet? and has it solved the problem?

Cheers
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Re: Annoying Rattle / Rasp Noise from exhaust?
« Reply #4 on Sept 1, 2006, 5:36pm »
It's not just mine then????

:)
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Re: Annoying Rattle / Rasp Noise from exhaust?
« Reply #5 on Sept 1, 2006, 6:18pm »
Ive youve done all thats mentioned above,and its still making a rattling noise,then check the fuel filter too.As I had an "exhaust rattle" as in it sounded JUST like the exhaust rattling away,and it was traced (after many,many months) to the fuel filter rattling away in its bracket.
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Re: Annoying Rattle / Rasp Noise from exhaust?
« Reply #6 on Sept 1, 2006, 7:46pm »
;D Try the mgf center Victoria seems to have a few late second hand ones look to see if yours is 4/6bolt manifold. sorted my rattle out.
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Re: Annoying Rattle / Rasp Noise from exhaust?
« Reply #7 on Sept 1, 2006, 8:48pm »
Spike
Whereabouts is the fuel filter positioned? i have found the oil filter.

Steve
Mine is an early F and think it is a 4 bolt? is this right??

Do you think that it is most likely the flexi pipe then??
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Re: Annoying Rattle / Rasp Noise from exhaust?
« Reply #8 on Sept 1, 2006, 9:07pm »
fuel filter is loacated under the inspection grill (under bootlid) to the very left hand side as you look in
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Re: Annoying Rattle / Rasp Noise from exhaust?
« Reply #9 on Sept 1, 2006, 10:22pm »
Looks a bit like a tin can with a pipe coming out the top.

:)
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Re: Annoying Rattle / Rasp Noise from exhaust?
« Reply #10 on Sept 2, 2006, 12:48am »

Quote:
Tony,

Have you replaced the flexi yet? and has it solved the problem?

Cheers


Replaceing the flexi did help cut down the rasp noise quite a bit and the rattle a little.

Most of the noise was caused by the broken exhaust though. To see more info Click Here
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Re: Annoying Rattle / Rasp Noise from exhaust?
« Reply #11 on Sept 2, 2006, 6:02am »
Mine is a 51 plate 6 bolt manifold
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Re: Annoying Rattle / Rasp Noise from exhaust?
« Reply #12 on Sept 2, 2006, 1:34pm »
Hmmm, seems to me Martin that you have covered all the 'usual suspects' sadly.

To recap:

1) Flexi pipe / front pipe
This is a really common problem, the flexible section is IMO of poor quality and also very vulnerable to damage under the car. I have had 4 of them over the years and am now on an X-Power 4:2:1 and have a familiar buzzing sound coming from under there - think the 4:2:1 flexi has gone too now. Flexis are either a spiral bound lead pipe core, surrounded by woven mesh or concentric rings to form the core surounded by woven mesh. The mesh tends to snag and then be stripped from the core (causing a buzz/tzing type noise) and/or the core becomes perforated or starts to break down causing a blow type noise. Mostly you get a combination of both.

2) There was an additional bracket produced by MGR that braces the manifold and the flexi pipe off of the block (where the two sections meet). Most cars don't have one and it's fine, some cars had them retro-fitted and i am told they cured the problem. Never seen one for real so i don't know much more i'm afraid - but this is a potential.

3) Outer casing on catalyst
This is also vulnerable to impacts and comes loose, causing a rattle / buzz

4) Exhaust strap
Most aftermarket systems do away with this, personally i don't think its necessary and tends to cause more issues than solve. Loose or damaged it can rattle / vibrate

5) Heat shield above silencer
Fibreboard with a foil veneer, it can delaminate causing a rattle/tzing type noise and is difficult to inspect without removing the silencer

6) Anything loose in the engine bay!
Less common, and very difficult to track down, anything loose in there can cause a rattle/vibration.

7) Induction noise
Standard system is designed to remove induction noise, aftermarket ones tend to promote it. This can be the source of unusual noises, particularly at set rpms

Of them all, 9 times out of 10 it is the flexi.
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Re: Annoying Rattle / Rasp Noise from exhaust?
« Reply #13 on Sept 2, 2006, 2:17pm »

Quote:
Spike
Whereabouts is the fuel filter positioned? i have found the oil filter.

As M9 and Andrew said.....and heres a piccie to help,the fuel filter is the one circled.
If you can see,the mechanics padded it all out with foam to stop the rattle,after all the usual suspects had been checked and found to be okay.Good luck and I hope you get it sorted asap. :)
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Re: Annoying Rattle / Rasp Noise from exhaust?
« Reply #14 on Sept 2, 2006, 4:15pm »
Good tip Spike. :)
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