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931 Exhaust Manifold Discussion LHD/RHD
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Fasteddie313  



Joined: 29 Sep 2013
Posts: 2224
Location: MI

PostPosted: Sat Dec 05, 2020 8:31 am    Post subject: Reply with quote

Is the crack all that bad anyway?
I never heard an exhaust leak from mine.. Are they significant enough to make a difference?
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MOTANUL  



Joined: 19 Nov 2018
Posts: 157
Location: ROMANIA BUCHAREST

PostPosted: Fri Dec 11, 2020 7:55 am    Post subject: Reply with quote

@Fasteddie313

It didn't sound very loud - but whoever knew engines would notice immediately.


Engine lose exhaust air from at least three places (1. exhaust manifold-cylinder head, 2. crack in exhaust manifold 3. exhaust manifold-Jpipe).

The air loss was not serious - and that's why you couldn't hear it unless you were very careful.

But in the long run, if you had a 5-hour trip to do, in the end, the cabin would smell of exhaust fumes. If I opened the window it smelled even worse.
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MOTANUL  



Joined: 19 Nov 2018
Posts: 157
Location: ROMANIA BUCHAREST

PostPosted: Fri Dec 11, 2020 7:59 am    Post subject: Reply with quote

Carrera RSR wrote:




How much does ceramic coating cost? for exhaust manifold?
How did it last over time?
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Carrera RSR  



Joined: 08 Jan 2010
Posts: 2194
Location: Somerset, UK

PostPosted: Fri Dec 11, 2020 6:41 pm    Post subject: Reply with quote

MOTANUL wrote:
Carrera RSR wrote:




How much does ceramic coating cost? for exhaust manifold?
How did it last over time?


This is done by Zircotec in the UK, circa £200 iirc. Its has survived as a coating but does not look as nice as it did when new. Its toned down a lot and now looks more 'rusty' in colour. Lots of 900deg heat cycles clearly pays its toll. The turbine housing also toned down but the exhaust front section and J pipe has kept its colour better.
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MOTANUL  



Joined: 19 Nov 2018
Posts: 157
Location: ROMANIA BUCHAREST

PostPosted: Sat Dec 12, 2020 8:06 am    Post subject: Reply with quote

From what I know, it is not recommended to apply a ceramic layer over the cast iron (exhaust manifold). Cast iron reaches a higher temperature (which is good for faster evacuation) but not good for cast iron (prone to cracks). There are no problems with steel (J-pipe for example).

In Bucharest I found a single offer of 500 euros only for exhaust manifold. I think I'm giving up on the idea.
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