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why is the engine mount different on a 931
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Dutch924-racer  



Joined: 23 Jul 2007
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Location: The Netherlands

PostPosted: Wed Jul 27, 2016 4:58 am    Post subject: why is the engine mount different on a 931 Reply with quote

Why does the 931 engine mount bracket has an extra bracket on the bottom ?

931:


924:

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Fifty50Plus  



Joined: 28 Feb 2008
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PostPosted: Wed Jul 27, 2016 5:27 am    Post subject: Reply with quote

Good question. I just sent one of each out to be powder painted and wondered the same thing.
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peterld  



Joined: 10 Dec 2006
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PostPosted: Wed Jul 27, 2016 5:47 pm    Post subject: Reply with quote

Hmm? ROW don't.
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ideola  



Joined: 01 Oct 2004
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PostPosted: Wed Jul 27, 2016 11:23 pm    Post subject: Reply with quote

Hmm. Different part numbers in PET. Will have to look at one of my unmolested 931s to see if there's anything mounted to that little dongle.
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Dutch924-racer  



Joined: 23 Jul 2007
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PostPosted: Thu Jul 28, 2016 3:50 am    Post subject: Reply with quote

peterld wrote:
Hmm? ROW don't.


my cars are row (EU) and both have this. Maybe difference because yours is a RHD ?
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Fifty50Plus  



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PostPosted: Thu Jul 28, 2016 5:54 am    Post subject: Reply with quote

Mine came from a ROW Left Hand Drive.
Dan will figure it out.
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peterld  



Joined: 10 Dec 2006
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Location: Noosa Heads QLD Australia

PostPosted: Thu Jul 28, 2016 11:30 am    Post subject: Reply with quote

I obviously stand corrected.......BUT have never seen that bracket on a RHD car.........very curious.........maybe some sort of shielding?
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ideola  



Joined: 01 Oct 2004
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PostPosted: Thu Jul 28, 2016 12:24 pm    Post subject: Reply with quote

I just checked on an all OEM US-spec 78 NA, and an all OEM US-spec 82 931. The NA doesn't have the extra dongle, the 931 does. However, there is nothing that I can see from up top that is attached to it. The A/C hoses run right behind there, maybe there's something on the back side that I can't see, but I can't ever recall mounting anything to that spot. Mystery remains.
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Mike9311  



Joined: 14 Dec 2004
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PostPosted: Sun Jul 31, 2016 8:46 am    Post subject: Reply with quote

For a change I feel like I can contribute ...

I save pictures of 24 stuff like crazy and this was off Ebay a short while ago, for an unmolested engine. It was listed for some big pocket change but anyway.... the answer ?

[/url]
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Mike9311  



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PostPosted: Sun Jul 31, 2016 8:51 am    Post subject: Reply with quote

Ok, now I am laughing at myself. Contributed?...nope.

Here is another view. Bites that this is on a stand in a way. Engine bay would have been better but it is a nice example.


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Rasta Monsta  



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PostPosted: Sun Jul 31, 2016 10:33 am    Post subject: Reply with quote

With the bolt and spacer installed as in the picture, I would think the mount is stiffened.
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Mike9311  



Joined: 14 Dec 2004
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Location: Chicago-ish

PostPosted: Sun Jul 31, 2016 12:09 pm    Post subject: Reply with quote

Rasta Monsta wrote:
With the bolt and spacer installed as in the picture, I would think the mount is stiffened.


Funny, crossed my mind but I thought it was an awfully big bolt just to do that? I also thought they could have stiffened it just by connecting that sheet metal and maybe an additional spot welded section underneath. Interesting though, had me trying to zoom in on the bolt head for specs. Also, I was wondering if a GT or GTS used it for some reason?? GTR's seem to have an Aluminum mount
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1979 924 NA ohne 650 mit 471
1982 931 Red Resurrection - 951 IC
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1982 931 wana-be GTR race car
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ideola  



Joined: 01 Oct 2004
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Location: Spring Lake MI

PostPosted: Sun Jul 31, 2016 1:26 pm    Post subject: Reply with quote

I want an engine stand like that.

The PORSCHE script plate on the intake is on upside down.
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Mike9311  



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PostPosted: Mon Aug 01, 2016 1:29 am    Post subject: Reply with quote

Dan you see the details nobody else does

What if its just an access opening in the mount. Once access is not needed, its stiffened by the bolt. I say this because the bracketed mount is a stiffer version since the sheet metal goes deeper in that section increasing cross sectional area, increasing stiffness. Still seems like a big bolt but interesting approach. I also don't have a mount in front of me but isn't this a welded on sheet metal 'cap' addition in this area to a standard mount?

See this pic. It isn't nearly flat like the NA version. Harder to get at the nut


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Fasteddie313  



Joined: 29 Sep 2013
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PostPosted: Mon Aug 01, 2016 5:27 am    Post subject: Reply with quote

you sure its not a secondary lift point for balancing the motor or the way the factories jig grabs it for assembly/installation???
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