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Intake plenum idea.

 
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Shurick  



Joined: 15 May 2005
Posts: 524
Location: Russia, Moscow.

PostPosted: Sun Mar 22, 2009 8:02 pm    Post subject: Intake plenum idea. Reply with quote


Full size: http://pics.livejournal.com/woxed/pic/000ayzc2

It's just a trial fit to ensure that in could be done.=)
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'79 931 -- intercooled K26-3060-6.10 turbo @ 1.2 bar, EFI+EDIS, 951S brakes, stripped interior, 951 look.
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Raceboy  



Joined: 01 Mar 2004
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PostPosted: Sun Mar 22, 2009 9:57 pm    Post subject: Reply with quote

I think it looks good but perhaps using custom flange to head or 924 Weber manifold is necessary. Needs to be modified for 931.
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Shurick  



Joined: 15 May 2005
Posts: 524
Location: Russia, Moscow.

PostPosted: Mon Mar 23, 2009 1:04 am    Post subject: Reply with quote

The head side flange is not a problem. A lot of welding, but nothing impossible.
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'79 931 -- intercooled K26-3060-6.10 turbo @ 1.2 bar, EFI+EDIS, 951S brakes, stripped interior, 951 look.
'86 924S -- R.I.P.
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Rich H  



Joined: 10 Jun 2007
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PostPosted: Mon Mar 23, 2009 4:50 am    Post subject: Reply with quote

What are the bits from?
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gegge  



Joined: 27 Jul 2007
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Location: Sweden

PostPosted: Mon Mar 23, 2009 5:25 am    Post subject: Reply with quote

Intake from an 16V golf, 41mm and upsidedown? Please be advised that the flow is bad for the first runner, 133-150-156-156cfm@28´. I did some research and was close to buy the Dahlback racing inlet. The large port 51mm got the same problem 175-202-198-198cfm@28´

Wasn´t the spacing wrong? I measured 90mm c/c for the VW runners and Porsche got 95mm?
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Rasta Monsta  



Joined: 12 Jul 2006
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PostPosted: Mon Mar 23, 2009 5:46 am    Post subject: Reply with quote

Planning on pulling the turbo to see what has fallen inside?
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Shurick  



Joined: 15 May 2005
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Location: Russia, Moscow.

PostPosted: Mon Mar 23, 2009 6:45 am    Post subject: Reply with quote

The turbo plans are simple: rebild and 2664 cold side from audi. It should be exact dimentions as CGT turbo in result.
Yes, the intake bits are from VW Golf II with KR engine. The first runner flow problem is well known, but the stock porsche plenum is even more restrictive.The overall air consumtion of the original M31 engine is not big enough to outgrow the abilities of 16v plenum I think. The spacing is not a big problem. We'll weld it out.=)
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WBR, Shurick
'79 931 -- intercooled K26-3060-6.10 turbo @ 1.2 bar, EFI+EDIS, 951S brakes, stripped interior, 951 look.
'86 924S -- R.I.P.
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Shurick  



Joined: 15 May 2005
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Location: Russia, Moscow.

PostPosted: Sun Apr 05, 2009 4:32 am    Post subject: Reply with quote

All parts are welded up. Needs some polish work, but already very pretty I think.


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'79 931 -- intercooled K26-3060-6.10 turbo @ 1.2 bar, EFI+EDIS, 951S brakes, stripped interior, 951 look.
'86 924S -- R.I.P.
https://www.instagram.com/ru_pacecar/
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flosho  



Joined: 01 Jul 2004
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Location: Eau Claire, Wisconsin

PostPosted: Sun Apr 05, 2009 12:22 pm    Post subject: Reply with quote

I like it!!!
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ideola  



Joined: 01 Oct 2004
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PostPosted: Sun Apr 05, 2009 12:35 pm    Post subject: Reply with quote

Impressive!!!
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Grenadiers  



Joined: 20 Feb 2007
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PostPosted: Wed Jul 22, 2009 10:03 pm    Post subject: Reply with quote

[/quote]

I like the universal 924 'bolt tray', bet everyone uses those!! In fact, even after tooling on down the road, bolts/nuts still stay there. Priceless!
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931 twinturbo  



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PostPosted: Wed Aug 29, 2012 6:48 am    Post subject: Reply with quote

Any updates????
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fiat22turbo  



Joined: 18 Jan 2006
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PostPosted: Wed Aug 29, 2012 7:56 am    Post subject: Reply with quote

Grenadiers wrote:


I like the universal 924 'bolt tray', bet everyone uses those!! In fact, even after tooling on down the road, bolts/nuts still stay there. Priceless![/quote]

Unless you're running adjustable camber plates, then they fall through the hole
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!tom  



Joined: 28 Aug 2006
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PostPosted: Wed Aug 29, 2012 12:58 pm    Post subject: Reply with quote

Grenadiers wrote:
I like the universal 924 'bolt tray', bet everyone uses those!! In fact, even after tooling on down the road, bolts/nuts still stay there. Priceless!

I've even found that the oil filler cap stays put there!
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MikeJinCO  



Joined: 08 Jun 2010
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Location: Maysville, Colorado

PostPosted: Wed Aug 29, 2012 3:47 pm    Post subject: Reply with quote

The bolt tray is priceless and so true. A possibility to improve flow might be to mill a tapered spacer that changes the throttle body angle probably by only a few degrees to improve the approach angle.

I could probably make one of these out of plastic on my cnc router if I had dimensions. Once the overall dimensions are set, trying different angles is a very quick change. I would not get a good enough surface finish to the spacer so that std. gasket material could be used without making an entire second holding device for every angle as my unit is a 3 axis rather than 5 axis machine. When I cut with a .125" round router bit and use a .008" cross feed I get a surface scallop of maybe .001-.002"(I can't measure it). The bolt holes would have to slightly oversize to compensate for angle change, and the bolt heads would no longer be square to the TB. I have quite a bit of 1/4" acrylic around and can also get 1/2" cutting board scraps easily. That could be fun.
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