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hood scoop install

 
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ZODIAC  



Joined: 08 Apr 2009
Posts: 342
Location: West Haven, Ct

PostPosted: Mon Mar 08, 2010 3:56 pm    Post subject: hood scoop install Reply with quote

if the weather is still good on tuesday(my day off) i'm going to try and install my new GT hood scoop. my question for those of you who have installed them already is, should i get some rubber or something to make a gasket to go between it and the hood? it didnt come with any instruction, just the scoop and the screws to hold it on.


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Grenadiers  



Joined: 20 Feb 2007
Posts: 3222
Location: Nelson, WI & Prescott, AZ

PostPosted: Tue Mar 09, 2010 12:12 am    Post subject: Reply with quote

I have a GT Racing hood scoop on my car, but it has an edge all the way around it. I went with the 'industrial' look (meaning, lazy), and riveted it on. I like the look, the hood has been painted to match since this photo. I did not use a gasket between the hood and scoop.

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ZODIAC  



Joined: 08 Apr 2009
Posts: 342
Location: West Haven, Ct

PostPosted: Sun Mar 14, 2010 2:17 am    Post subject: Reply with quote

mine doesnt have that lip around it and it dips down in the front so i have to cut the hood a little more to accomodate for that. but it has holes in the underside that are threaded for screws that came with it. i figure i'll just put a layer of RTV on it to help hold it in place and reduce friction between it and the hood.
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Carrera  



Joined: 13 Nov 2009
Posts: 143
Location: Helsinki, Finland

PostPosted: Thu Mar 18, 2010 7:50 pm    Post subject: Reply with quote

ZODIAC wrote:
mine doesnt have that lip around it and it dips down in the front so i have to cut the hood a little more to accomodate for that. but it has holes in the underside that are threaded for screws that came with it. i figure i'll just put a layer of RTV on it to help hold it in place and reduce friction between it and the hood.


Zodiac, unfortunately I haven't installed mine yet, but mine looks identical to yours. I bought mine used on eBay and I don't have a clue on which "brand" it is. May I ask which brand yours is?

Any pointers and experiences on the installation would be highly appreciated
I'll actually have the hood cut by the painter in mid April...
In case you have a standard normally aspirated cars hood (not 931 hood), some measurements on the hole on the hood would also be appreciated.

On the original 937 scoop there is a round "rubber band" that goes around the scoop... there is an original 937 for sale at the shop where I have my cars serviced, so I had a closer look at it
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Grenadiers  



Joined: 20 Feb 2007
Posts: 3222
Location: Nelson, WI & Prescott, AZ

PostPosted: Fri Mar 19, 2010 12:13 am    Post subject: Reply with quote

Is the 'rubber band' under the hood? Then, that's to seal the intake ram to the top mounted intercooler. I have said TMIC and used foam! Butt-ugly, but the oem rubber is very expensive, if even available.
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Carrera  



Joined: 13 Nov 2009
Posts: 143
Location: Helsinki, Finland

PostPosted: Fri Mar 19, 2010 1:39 am    Post subject: Reply with quote

Grenadiers wrote:
Is the 'rubber band' under the hood?

Nope... its visible on top of the hood though its been painted over. Having said that, although this example is in pristine condition, it is anyways 29 years old, so I can not guarantee its still in its original form... and I haven't yet seen what it looks like under the hood.



Here's a picture of a replica also with a rubber band, but now more visible as it hasn't been painted over.


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ideola  



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

PostPosted: Fri Mar 19, 2010 2:20 am    Post subject: Reply with quote

If you were going to go to the trouble of respraying a real Carerra GT (or even a decent facsimile of one), why in the interest of all that is good and beautiful would you not go to the minor trouble of removing the scoop and the gasket?????? Man, I don't get it.

On a related note, you wouldn't believe some of the stuff we found on my 941 when my paint guy started doing the prep. But that's another story
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Carrera  



Joined: 13 Nov 2009
Posts: 143
Location: Helsinki, Finland

PostPosted: Fri Mar 19, 2010 4:59 am    Post subject: Reply with quote

ideola wrote:
If you were going to go to the trouble of respraying a real Carerra GT (or even a decent facsimile of one), why in the interest of all that is good and beautiful would you not go to the minor trouble of removing the scoop and the gasket?????? Man, I don't get it.

On a related note, you wouldn't believe some of the stuff we found on my 941 when my paint guy started doing the prep. But that's another story


Dan, do you know what the original scoops "rubber band" set up should be? The 937's I've seen don't seem to have black rubber on them... I admit the red one is the only one I've seen live...
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ideola  



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

PostPosted: Fri Mar 19, 2010 5:04 am    Post subject: Reply with quote

Admittedly, I do not know what the stock config is, but I was under the impression that it had the seal, not in body color, atop the hood like in the Yellow car example. Don't know why I have that impression, and it could be completely wrong...

...would have to dig through my photo archives to see if it reveals anything...gotta run in 5 minutes, so will have to come back to this later tonight...
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ZODIAC  



Joined: 08 Apr 2009
Posts: 342
Location: West Haven, Ct

PostPosted: Fri Mar 19, 2010 8:27 am    Post subject: Reply with quote

carrera; my car is an n/a but i have a custom intake manifold and downdraft carb setup. the entire CIS and original intake configurations have been removed before i bought the car. as for the brand it was advertised on ebay as being a GT raceing scoop, but i dont think it is.

i'll be posting pics of the install, i plan to hit it on sunday. i think i may try and get some thin rubber gasket material and make a gasket for it, or a good layer of RTV.

as far as measurments, i already have a roughly 12"x12" hole cut for the carb. my plan is to align the top right corner of the scoop (looking at it from the front as in my pic) with the top right corner of the cut in the hood. then just cut a section out for where the scoop dips down in the front.

hope this helps.
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pcelenta  



Joined: 16 Feb 2007
Posts: 546
Location: long island,ny

PostPosted: Sun Mar 28, 2010 10:34 pm    Post subject: Reply with quote

guys the factory welt seals for the hood scoop were available in body color. some of the colors are NLA. Just last year I purchased the welt seals for the rear flares and for the hood scoop of my car direct from my porsche dealer who had them fedexed from germany. On the PET you can see the part numbers and the colors...I ordered mine in silver as it had been originally equiped with. The aftermarked GT Racing CGT hood scoop pictured here has the flange lip going the wrong way...on the originals it is hidden underneath the scoop and has holes to bolt it to the hood. the seal is sandwiched betwwen the hood and scoop before bolting it. regards, Paul (mystery CGT project pictures comming soon!)
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joecitizennn  



Joined: 12 Sep 2005
Posts: 2096
Location: no mans land

PostPosted: Sun Mar 28, 2010 11:34 pm    Post subject: Reply with quote

ZODIAC wrote:
i figure i'll just put a layer of RTV on it to help hold it in place and reduce friction between it and the hood.


be careful using silicone on a surface you plan to paint
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Vince Ponz  



Joined: 02 Nov 2002
Posts: 3581
Location: Florida

PostPosted: Mon Mar 29, 2010 12:51 am    Post subject: Reply with quote

I kind of like the black showing under the scoop. Brings attention to it.
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Carrera  



Joined: 13 Nov 2009
Posts: 143
Location: Helsinki, Finland

PostPosted: Mon Mar 29, 2010 3:09 am    Post subject: Reply with quote

pcelenta wrote:
guys the factory welt seals for the hood scoop were available in body color...

That was good information!
My scoop is not original, looks identical to ZODIAC's scoop though. I do have a flange lip but it does not have holes to bolt on the hood... but in order to be able to bolt it on from the flanfge you shoud also have a factory original 937 hood ... which I don't have...
Lets hope the scoop will hold with the seven locking nuts.

The silver welt seal is still available from the factory. At least the Porsche Classics page shows they have them in stock for about 15€ ($20).
Part number: 937 571 121 01 and then 97A for silver.
My car happens to be platinum so a silver seal is a no-go... blck would have been ok...
There is yet another seal for about 10€ ($14), part number 999 911 276 40. Don't know where this is supposed to go... no picture in PET.

What I would still need is the IC seal that goes under the scoop. Part number 937 511 113 00. That one doesn't seem to be available anymore...
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reilly525i  



Joined: 07 Nov 2009
Posts: 222
Location: southern california

PostPosted: Sat Apr 03, 2010 1:57 am    Post subject: Reply with quote

while doing a very similar functioning scoop on my old mk2 I used a length of door edge trim. it looked perfect, gave you a good snug mating surface and cost about 4 dollars at pep boys. it looked exactly like that yellow cgt there.
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