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Fasteddie313 · Joined: 29 Sep 2013 Posts: 2224 Location: MI

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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80 Turbo - Slightly Modified

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

@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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1980 Porsche 924 Turbo (931) diamond silver metallic/helios blue metallic
sold Porsche 924 NA 1979

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

Carrera RSR · Joined: 08 Jan 2010 Posts: 2194 Location: Somerset, UK

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

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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1980 Porsche 924 Turbo (931) diamond silver metallic/helios blue metallic
sold Porsche 924 NA 1979