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87 S, two different Manifolds

Anyone know the difference between the two? Right car was ABS, and the manifold is dated 87, left is dated 86. Both are registered as 87's. Note the round bit with the clip on it on the Right Manifold.


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Old 07-31-2013, 06:24 PM
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Frankly my dear....
 
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Well...apart from one is uber-shiney! I think the main difference is the vacuum take-off spigot (the round bit). On the UK cars there is a 'Y' shaped vacuum pipe that comes via a switch (or sensor) and connects to the top of the 'J' tube and the top of the Oil filler neck. See photo:



The US cars may not have been fitted with this as other 'stuff' (generally for emissions) is fitted instead. Got me thinking though - I don't actually know what the switch does and I cannot find it in the PET either ...anyone know out there?

BTW - the photo was taken well before I started cleaning and renovating - it doesn't look like that anymore!

It could just be that Porsche decided to upgrade the manifold from the earlier version (to reduce stock holding, etc.) and simply fit a blanking plate on the later manifolds where the vacuum take-off was not needed.
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Old 08-01-2013, 12:43 PM
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That makes sense. Wonder what that thingy does then.
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Old 08-01-2013, 12:59 PM
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Hmm, if part of the Y-tube to vacuum-port hose goes to the oil-filler, that connects directly to the crankcase. The electronic-valve could open the port when the car's warmed up? It would function as PCV then.
Old 08-01-2013, 01:54 PM
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Frankly my dear....
 
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Thumbs up

Yep Danno - I think you hit the nail on the head there...it sure does look like a PCV system. So it's an electronically controlled valve on the intake..probably driven directly from the DME unit. Thanks for your input..
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Porsche - accept no substitute
Blue 1999 Boxster - Brief encounter! Black 1988 944S - Ongoing project
Black 1987 944S - Gone but not forgotten
Metallic Black 1980 924 - Those were the days....
Red 1979 924 - Hmm Minerva blue 1979 924 - Where it all began!
Old 08-02-2013, 07:38 AM
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My '88 has it. Here's an old link with a tiny bit more info:

944S: what's this thing? - Rennlist Discussion Forums

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Old 08-04-2013, 04:57 PM
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