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Duncan

Do I understand correctly that there is a coolant passage in the flange of the intake manifold and therefore taking it off requires draining the coolant?

Or is that not what ther recess in the flange is for?

Regards and cheers,

Duncan
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1983 NA Alpineweiss since 2001
Peugeot 205 Generation

ideola · Joined: 01 Oct 2004 Posts: 15550 Location: Spring Lake MI

I've often wondered about that recess on the intake. I don't have any pictures handy of an NA head here at work, but on the 931 head, there are no water ports that could possibly feed water into that recess.
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erstwhile owner of just about every 924 variant ever made

Duncan · Posted: Wed Jul 21, 2010 6:19 am Post subject:

Hmmm. the picture in the Haynes does not show any ports on the flange either. But how accurate is the drawing.
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1983 NA Alpineweiss since 2001
Peugeot 205 Generation

Rich H · Posted: Wed Jul 21, 2010 6:30 am Post subject:

100% there is no water in the inlet manifold on either the N/a or Turbo.
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1994 Lotus Esprit S4 - Work in progress...
1980 Porsche 924 S2 DITC Turbo - Original spec
1978 Homo-Sapiens - Tired spec
1953 Landrover S1 - Pensioner Spec

Duncan · Posted: Wed Jul 21, 2010 6:37 am Post subject:

well the recess does suggests it is a channel that connects different ports on the head, so there is no water 'in' the manifold, but it could flow along the manifold. But if you are so sure, I will believe you

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1983 NA Alpineweiss since 2001
Peugeot 205 Generation

Duncan · Posted: Wed Jul 21, 2010 6:39 am Post subject:

But if you look in the PET there is a recess in the head too.
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1983 NA Alpineweiss since 2001
Peugeot 205 Generation

ideola · Joined: 01 Oct 2004 Posts: 15550 Location: Spring Lake MI

No accommodation for recess here.
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erstwhile owner of just about every 924 variant ever made

Duncan · Posted: Wed Jul 21, 2010 6:58 am Post subject:

But thats a turbo head:

Here's the pic from PET

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1983 NA Alpineweiss since 2001
Peugeot 205 Generation

ideola · Joined: 01 Oct 2004 Posts: 15550 Location: Spring Lake MI

I know. That's what I indicated. But remember, on the NA head, there is a one piece intake manifold gasket that completely covers that recess anyway, and there are no water jacket ports there. As I said, I've often wondered about the recess but have never been able to figure out it's purpose or function.
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erstwhile owner of just about every 924 variant ever made

brealytrent · Joined: 28 Dec 2008 Posts: 414 Location: Goldsboro, NC

Took mine off one night to get to the WUR, no water.
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1977 Porsche 924 - sold
1980 Porsche 931 - sold
1984 Porsche 928 'S2' Euro - sold
2016 Ford Fiesta ST - sold
2009 Porsche Cayman

emoore924 · Joined: 13 Apr 2004 Posts: 2822

No water.

I've seen the channel and ports too and the only thing I can figure is some sort of pressure balancing between the exhaust valves/chambers or something. If you poke a wire or something into the holes it reaches all the way to the base of the exhaust valve. Primitive emissions controls of some sort probably...

I'll ask my engine guy next time I talk to him and see what he says.