Re: Slightly OT - lagging car exhaust systems

"Christopher Wigdor" wrote

sound louder to me.

Yes, it will undoubtedly run hotter when the roads are dry, but I think you will be actually worse off as the water will be retained around the exhaust for longer when they are wet - as they so often bl**dy are - . Also, in heavy rain, I can see water soaking into the lagging from the ground and cooling the system.

I agree about the noise of stainless systems, but I suspect that this is largely because the silencing arrangements inside the silencers (hole size, pipe length etc) are pretty standard and empirical as they are all aftermarket stuff.

I have long thought it would be well worthwhile getting a bog standard system and having it hot dip galvanised. I have a dustbin that to my certain knowledge is fifty years old which is only now getting rather thin at the bottom!

Regards,

Kim Siddorn.

Thank you Kim - I should have thought of galvanising. The windows on this house are galvanised and there is absolutely no corrosion anywhere, after more than 40 years of full frontal wet westerly's at around 700ft. altitude. And the man whose firm made them is our next door neighbour. If it's possible to include an exhaust system with a batch of windows, then it may be sufficiently economical. I would like to keep the car for quite a while longer - it's quite the best I have ever had.

Christopher W.

In message , Christopher Wigdor writes

Exhaust consumption does seem rather high!

Our Peugeot has now done 67k miles and the exhaust is still sound - similar mileage to you at 1000m per month. Our last car also a Peugeot went 88k miles before the silencer holed.

Galvanising will only protect the outside and the damage usually occurs from the inside.

Gentlemen, There is only one small problem with galvanising it and that is you cannt get inside and if it did it would ruin the catalyst, failed MOT emmissions, and if as you suggest you dont do the miles it will still rot inside out. Visit a museum a few hundred miles from home once a month, it will help slow the rot but not stop it. I used to drive a Vauxhall Cavalier (later model) which when I sold it had

156000 miles in just over three years. It still had the original cat fitted, it was never cold.

Mart> Thank you Kim - I should have thought of galvanising. The windows on

It's aft of the catalyst converter where the problem lies - everything from the manifold to that point is original and perfect.

Why is it not possible for a system to be hot dip galvanised inside and out? I thought that such galvanising meant total immersion which, with a simple pipe and uncomplicated silencer, should coat the innards nicely. Or am I missing something?

Christopher W.

Surely the point of hot-dip galvanizing is that it coats the inside too. It's not the same as electroplating ;o))

Regards,

Kim Siddorn.

Chris,

Galvanising sounds a good idea but most silencers contain a fibre glass matting type material and I suspect the galvanising would do it a lot of no good!

Are you using genuine Citroen exhausts? Almost always the aftermarket products from a typical exhaust centre have a much reduced life.

40 years in the motor trade has taught me stainless systems tend to crack due to fatigue and manufactures genuine systems always last longer

To answer the question, the two replacement systems fitted so far were not Citroen's own, but the very best of aftermarket pattern systems. The pattern systems have lasted about the same time as the original Citroen system. The chap who looks after the car for me was originally workshop foreman at our local Citroen dealer, which dropped Citroen in favour of Volvo, at which point he bought all of the Citroen workshop kit and set up on his own.

I will ask about the silencer and its stuffing - thank you for that. I was right to ask this question of this group - the combined wisdom is indeed considerable.

Yours,

Christopher W.