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Should I replace my rusty manifolds?
Yes, the car is going to be much better with new
15%
 15%  [ 3 ]
No, you won't really notice any difference
84%
 84%  [ 16 ]
Total Votes : 19

Author Message
APL911
Spa-Francorchamps


Joined: 15 Aug 2017
Posts: 300



PostPosted: Fri Apr 13, 2018 1:15 pm    Post subject: Rusty Manifold. Should I bother replacing Reply with quote

Hi all

I am in the process of getting quotes to replace my heavily corroded exhaust manifolds.

The flanges are complety wrotten, and the fixings are in terrible shap.

My question is this. Should I bother? What is the worst that can happen if I just leave it? It's not blowing, and it's pretty solidly rusted in place.

I do like the idea of nice shiny new manifolds, but I'm not really sure what difference it will make and if it is worth the £1,000+ it is likley to cost.

What are your thoghts?
 
  
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MisterCorn
Long Beach


Joined: 08 Jan 2011
Posts: 6349
Location: Nottingham, England

2004 Porsche 996 Turbo

PostPosted: Fri Apr 13, 2018 1:19 pm    Post subject: Reply with quote

I would wait until something needs doing on it. That is the plan with mine anyway.

MC
 
  
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INWB
Monza


Joined: 02 May 2016
Posts: 172
Location: Leicestershire


PostPosted: Fri Apr 13, 2018 1:26 pm    Post subject: Reply with quote

If your car is a keeper then you may want to bite the bullet.

My car is better after doing them. Used the Top Gear ones. The biggest bill was the labour and GCR took pity on me and only charged me the estimate (which was eye watering enough). Every bolt snapped.

So glad I did mine now. (resprayed the support brackets for the mufflers at the same time)
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wasz
Magny-Cours


Joined: 28 Dec 2012
Posts: 2635


1999 Porsche 996 Carrera 2

PostPosted: Fri Apr 13, 2018 2:00 pm    Post subject: Reply with quote

Theres two schools of thought:

Leave it, might never happen, they can look really really bad and not leak.

Or

Do it now so you are not left in the middle of France with a 996 that sounds like a tractor.

Has anyones got so bad it has leaked this badly?

When I do get around to mine, I'll be buying/borrowing a jig and buying the finest, sharpest drill bits money can buy.
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wasz
Magny-Cours


Joined: 28 Dec 2012
Posts: 2635


1999 Porsche 996 Carrera 2

PostPosted: Fri Apr 13, 2018 2:02 pm    Post subject: Reply with quote

Plus there is always the risk that you will spend 2 days drilli
ng on your back with swarf in your eyes, then 2 months later a head needs to come off anyway for something else. Or you drop the engine for something else and put it on a stand.

Then you will be cursing not being able to do it on the bench.

Mine is staying put until it leaks (if it ever does).
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freshy
Trainee


Joined: 13 Oct 2016
Posts: 84



PostPosted: Fri Apr 13, 2018 2:21 pm    Post subject: Reply with quote

Mine doesn't look pretty, personally I'm leaving it alone until it starts to blow.
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Robertb
Long Beach


Joined: 01 Sep 2003
Posts: 6714
Location: South Oxfordshire

2002 Porsche 996 Carrera 4S

PostPosted: Fri Apr 13, 2018 2:47 pm    Post subject: Reply with quote

Plenty of other higher priority jobs on mine.

It can stay rusty until it actually starts blowing, or until the engine is out for some other major work (heaven forbid!)
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g911omr
Monza


Joined: 29 Sep 2009
Posts: 221



PostPosted: Fri Apr 13, 2018 2:50 pm    Post subject: Reply with quote

If it were me, I'd leave them until they need doing. New ones do look smart though.
 



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alex yates
Brands Hatch
Brands Hatch


Joined: 06 Mar 2014
Posts: 14451
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Fri Apr 13, 2018 3:23 pm    Post subject: Re: Rusty Manifold. Should I bother replacing Reply with quote

APL911 wrote:
the £1,000+ it is likley to cost.



Da fook!

Where you getting it done - Harrods?

Cost me £356 for parts and labour.
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Stoo.c
Monza


Joined: 07 Apr 2014
Posts: 188
Location: Hertfordshire


PostPosted: Fri Apr 13, 2018 3:29 pm    Post subject: Reply with quote

I'm guessing he's including the price of having his bolts all drilled out which can easily reach £500 so £1000 all in isn't far off of what one might expect.
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g911omr
Monza


Joined: 29 Sep 2009
Posts: 221



PostPosted: Fri Apr 13, 2018 3:41 pm    Post subject: Reply with quote

If all the studs come out in one piece then it isn't a challenging job.
I bet they don't though....
 
  
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sackerley
Silverstone


Joined: 16 Mar 2016
Posts: 125



PostPosted: Fri Apr 13, 2018 3:47 pm    Post subject: Reply with quote

I'd leave it. Mine are a mess and look terrible but I'm going to leave it until it really needs doing.

Far more things to spend the money on!
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alex yates
Brands Hatch
Brands Hatch


Joined: 06 Mar 2014
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Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Fri Apr 13, 2018 3:49 pm    Post subject: Reply with quote

Stoo.c wrote:
I'm guessing he's including the price of having his bolts all drilled out.


So was I!
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arry
Hockenheim


Joined: 02 May 2015
Posts: 731
Location: South Essex


PostPosted: Fri Apr 13, 2018 6:48 pm    Post subject: Reply with quote

freshy wrote:
Mine doesn't look pretty, personally I'm leaving it alone until it starts to blow.


Exactly how I've treated my wife for 13 years.
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deMort
Zolder


Joined: 21 Mar 2015
Posts: 5508
Location: Brighton


PostPosted: Fri Apr 13, 2018 6:53 pm    Post subject: Reply with quote

If there was an option for .. Good God Dont Touch It Unless You Have To ... then i would have voted for that !!

Its rusty .. it dont look pretty .. short of getting run over by the car or its on a ramp then whos going to notice .

I see shed loads of mainifolds in a poor condition .. i can count the number of times ive seen an exhaust leak from them on one hand !

They have to come off to do certain types of work .. they have to come off if you are modifiying the exhaust .. if none of these then dont bother .. probably plenty of other areas you could spend the money on .

Flange gaskets and bolts can be replaced .. thats not a problem as you dont need the mainifold off to do that .

Did i make my point Question Floor
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APL911
Spa-Francorchamps


Joined: 15 Aug 2017
Posts: 300



PostPosted: Fri Apr 13, 2018 7:00 pm    Post subject: Reply with quote

Thanks guys. Decision made! Floor
 
  
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alex yates
Brands Hatch
Brands Hatch


Joined: 06 Mar 2014
Posts: 14451
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Fri Apr 13, 2018 9:22 pm    Post subject: Reply with quote

Those manifold bolts are like ingrowing toe nails. The sooner it's addressed, the easier the pain. You're just ramping the bill up leaving it.
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INWB
Monza


Joined: 02 May 2016
Posts: 172
Location: Leicestershire


PostPosted: Sat Apr 14, 2018 7:22 pm    Post subject: Reply with quote

I have new manifolds (see above) but they have gone very dark - even look rusty! Is that normal????? I was expected the shiny manifolds to stay shiny
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alex yates
Brands Hatch
Brands Hatch


Joined: 06 Mar 2014
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Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Sat Apr 14, 2018 7:37 pm    Post subject: Reply with quote

The clue's in the name - Stainless, not Stainproof.
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INWB
Monza


Joined: 02 May 2016
Posts: 172
Location: Leicestershire


PostPosted: Sat Apr 14, 2018 8:12 pm    Post subject: Reply with quote

alex yates wrote:
The clue's in the name - Stainless, not Stainproof.


Thanks Alex. Smile I'm not that good with stuff like that. Can I get bolts that don't corrode? The new ones already have surface rust.
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