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I mate of mine had a 964 C2 some years ago that did the same thing, again only under load. The problem was leaking between the head and the cylinder.
I'd imagine that a leak between head and exhaust manifold would sound similar.
It's gonna get looked at this thursday. We'll see how it goes.. From just looking under the car all looks well, but i'm dubious about the gasket used..
My sympathies with the OP as i have exactly this problem on mine at the moment :roll:
Mine however is still on the standard manifolds and I'm pretty sure that in the 13 years of my ownership have never been off. The ticking is only present when under load - even to the point that I can rev it to 4,000 without inducing the ticking. everything else on the car is normal and it started during an 'enthusiastic moment' on a recent driving trip in Serra do Estrela
In my case, I can actually feel the gases coming out of the blackened area in the attached a pic which might be of use I hope - mine is also on the N/S
I'm hoping that the bolts etc will behave themselves while we fix it - fingers crossed!
so it appears that the triangular gasket between manifold and cat has blown itself to two pieces! currently on the lift awaiting replacement.. stay tuned
close look at manifold gaskets reveals absolutely no sooty spots or signs of leak.. and I gave it an honest spanking for a few days!
well... blowing still with a new gasket, also from the triangle - something's not matching up correctly... (manifold flange to cat flange). I can actually feel it on my hand. Not sure what to do now - contacted the manifold seller... *****
Thicker more compliant gasket material.... though appreciate that may not be to hand, dependant on the resultant miss-fit dimensions paste may just break up and blow out in time.... Perhaps two, three or more standard gaskets with a light smear of paste between each layer and the system may provide a tick free situation meantime...?
Just check there is no weld sitting proud on the manifold from when they weld the tubing to the flange, usually on the inner edge, I can imagine quality control may have missed that on the assembly line. :lol:
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