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Registered User
Join Date: Jul 2003
Location: Richmond, Virginia
Posts: 112
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1983 930 Rebuild - Cylinder Options
Hey 930 folks --
I am tearing down a 1983 930 for a bottom-end up rebuild. My intentions are to keep the engine as stock as possible. The only upgrades I want to consider are those that are considered necessary and are well accepted by the Porsche community, e.g., ARP rod bolts, ARP head studs, etc. My question regards pros and cons between the stock 3.3 litre half-finned cylinders vs. another cylinder option such as 965 fully finned cylinders or 911 3.2 litre cylinders bored out to 97mm and replated or 3.4 litre upgrades. Does anyone have any thoughts on each of those options or some other suggestion? Thanks, Duane
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'79 911SC Targa -- "BLUVUDU" '83 930 Coupe -- "TURBAUX" |
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10-31-2006, 06:23 AM
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Registered
Join Date: Jan 2003
Location: Burlington, Wisconsin
Posts: 9,672
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contact henry schmidt at supertec. they have been working with QSC for a while now and has had good luck with the QSC cylinders
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Ben 914-6 2.4s GT tribute. 914-6werkshop.com manufacturer of 914-6, GT, Conversion parts |
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10-31-2006, 06:59 AM
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Registered
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If you don't want to spend the money and you're really not going to do many mods, you'll probably be fine with stock cylinders. You should send them out to have the bores checked. Odds are good that they'll need to be replated which is about $600. So there's $600 toward new cylinders. If you decide to go with new cylinders, there are several choices so do some research.
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2014 Cayman S 2011 Cayenne Turbo 1979 930 (475 rwhp at 0.95 bar) |
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10-31-2006, 07:03 AM
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typ 911
Join Date: Aug 2005
Location: Palm Desert, CA
Posts: 264
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I agree with mb911, Henry's QSC cylinders are an excellent option
and are perfectly suited for turbo use. Cylinders are avail. from 80mm to 102mm. Contact Henry and he will explain more. 760-728-3062. |
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10-31-2006, 07:59 AM
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resident samsquamch
Join Date: Oct 2005
Location: Cooterville, Cackalacky
Posts: 6,815
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I used Henry's QSC 98MM (3.4L) cylinders with JE pistons in my rebuild and have had zero probelms with them. I'm just nearing the 5,000 mile mark on my rebuild and it's a daily driver. Maybe time will tell, but right now, I'm happy with my descision. If I had the budget, I would have done the Mahles...but things add up real quick when you get in there!
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-jeff back in the saddle: '95 993 - just another black C2 *SOLD*: '87 930 GP White - heroin would have been a cheaper addiction... "Ladies and Gentlemen, from Boston Massachusetts, we are Morphine, at your service..." - Mark Sandman (RIP  )
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10-31-2006, 09:25 AM
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Registered User
Join Date: Mar 2002
Posts: 3,563
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Curious, isn't there a fully finned kit out there for the normal 930 cylinders?
When I had my rebuild done, the mechanic suggested I fit the "full fin kit" on the 930 cylinders I supplied him.
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Merv '89 911 Turbo Cab Protomotive MAP ECU, Twin Plugged Heads, GT2-EVO CAMs, 3.3L fully finned P&C's, ARP fasteners, C2T head gaskets, Titanium Retainers, Turbo spec valves, springs & guides, 964 splash valves, GT35R BB turbo, GSF Stainless Headers, Magnaflow Exhaust, Full bay Intercooler, TiAL 46mm w/gate, TiAL 50mm BOV, Apexi AVC-R EBC, SPEC Stage3+ Clutch kit, Crane CDI Ignition 
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10-31-2006, 05:48 PM
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Registered User
Join Date: May 2002
Location: Up North
Posts: 1,446
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I heard that the factory 930 replacement ones are also fully finned now though I don't have 1st hand experience.
For my rebuild, after many false starts on getting cylinders, I ended up using Perfect Bore.
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87 930 K27HFS/B&B/Twin-Plug... Megasquirted 
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10-31-2006, 06:22 PM
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Me like track days
Join Date: Sep 2003
Location: Kirkland, WA
Posts: 10,205
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Refinsih the stock or get $3,200 3.4 98mm
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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 |
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11-01-2006, 11:48 AM
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Registered User
Join Date: Jul 2003
Location: Richmond, Virginia
Posts: 112
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Thanks to all for your input with a special thanks to Craig at Rennstore for his cylinder advice and for his pic of the euro 930 with the extra special headlight package!!! (See Off-Topic Forum unless Z-man got there first.)
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'79 911SC Targa -- "BLUVUDU" '83 930 Coupe -- "TURBAUX" |
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11-02-2006, 12:00 PM
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Me like track days
Join Date: Sep 2003
Location: Kirkland, WA
Posts: 10,205
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The dual 36C hgh beams - filled with blinker fluid?
Sure, you are welcome ;-)
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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 |
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11-02-2006, 12:14 PM
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Registered
Join Date: Jul 2005
Location: Cleveland, OH
Posts: 1,098
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just get a set of used 91 (92?) fully finned P/C's. They'll bolt right on. Trade in your old standard half finned 930's and could probably get a set for ~$1k.
*** NOTE *** if you do this, you'll need to get head gaskets and they're o-ring sealed at the bottom. |
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11-03-2006, 07:52 PM
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Forced Induction Junkie
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Quote:
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Dave '85 930 Factory Special Wishes Flachbau Werk I Zuffenhausen 3.3l/330BHP Engine with Sonderwunsch Cams, FabSpeed Headers, Kokeln IC, Twin Plugged Electromotive Crankfire, Tial Wastegate(0.8 Bar), K27 Hybrid Turbo, Ruf Twin-tip Muffler, Fikse FM-5's 8&10x17, 8:41 R&P |
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11-04-2006, 02:16 PM
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1979 Porsche 930 3.4
1985 Porsche 930 Fac. Slantnose 3.3l
