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Me like track days
 
Craig 930 RS's Avatar
 
Join Date: Sep 2003
Location: Kirkland, WA
Posts: 10,196
Go with 7.5 Mahles, you won't regret it.
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- Craig 3.4L, SC heads, 964 cams, B&B headers, K27 HF ZC turbo, Ruf IC. WUR & RPM switch, IA fuel head, Zork, G50/50 5 speed. 438 RWHP / 413 RWTQ -
"930 is the wild slut you sleep with who tries to kill you every time you "get it on" - Quote by Gabe
Movie: 930 on the dyno
Old 11-23-2008, 06:03 PM
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Join Date: Nov 2006
Location: UK
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HotRod, you could of course go with 8:1 if you want better off boost response and run less boost until you went EFI.
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1981 UK 930. G50/01 shortened, 964 3.8RS Fibreglass Body Kit, 18" Alloys 8.5" F & 10" R, 225's F & 285's R, Special Colour Metallic Blue Paint, FIA Sparco Evo's, A/C and Air Pump removed, Electronic Boost Controller, GHL Headers, Tial46 WG.
Fitting - New service kit.
Needs Fitting - Innovate XD-16 Kit, Kokeln IC. Stephen's K27 HFS, EVO Intake Assy & his Modded USA Fuel Head.

1983 UK 911 3.2 Carrera Sport Coupe. Black, Black Leather with Red Piping, Black Alloy Gear Knob, K&N Air Filter Element, Turbo Tie rods.
Needs Fitting - K&N CO Sensor, Round A/F Dial Gauge, Factory Short Shift Kit.

http://www.danasoft.com/sig/Iamnotanumber.jpg
Old 12-04-2008, 08:44 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #22 (permalink)
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David's Avatar
 
Join Date: Apr 2002
Location: Houston (Clearlake), TX
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The stock 930 intake port in the head is about 36mm but it necks down to about 32mm at the intake.
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2014 Cayman S
2011 Cayenne Turbo
1979 930 (475 rwhp at 0.95 bar)

Last edited by David; 12-05-2008 at 02:14 PM.. Reason: Clarification
Old 12-04-2008, 11:24 AM
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Join Date: Nov 2002
Location: Burke, Virginia
Posts: 73
Yeah, mine necks down to 33mm right at the intake, I haven't measured the plastic spacers yet to see what they are...or the heads
Old 12-04-2008, 11:40 AM
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Join Date: Jun 2003
Location: Granada Hills
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I'm magnesium welding my stock intake and then open the ports. Well actually Kevin at UltimateMW will do the porting.
Old 12-04-2008, 01:31 PM
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Location: Burke, Virginia
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Why the welding, wouldn't extrudehone clean them up and then just machine the intakes to whatever you want them to be?
Old 12-04-2008, 06:50 PM
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Location: Granada Hills
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I'm opening the ports to 41mm and so I need the extra alloy around the ports.
Stock intake does not have enough material around the ports to adequately seal after the porting is done.
Old 12-05-2008, 09:29 AM
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Join Date: May 2006
Location: UK
Posts: 1,172
My intake manifold was ported, along with the heads, don'tknow to what size though. This is a pic of a ported 930 manifold, not mine. Don't know if you can tell how much has it's been opened up from this shot?

Old 12-05-2008, 10:56 AM
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Location: Granada Hills
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My ports look about that size and they are ported to 36mm. I'm doing an EFI conversion with bigger valves and 41mm ports on the heads. I'm also using 76.6 mm stroke crank and 98 mm mahles P/Cs for ~ 3.5L. It took weeks to nail down the magnesium welding technique.
Old 12-05-2008, 12:10 PM
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