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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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'83 930 Coupe -- "TURBAUX"
Old 10-31-2006, 05:23 AM
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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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Old 10-31-2006, 05:59 AM
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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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Old 10-31-2006, 06:03 AM
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typ 911
 
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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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Old 10-31-2006, 06:59 AM
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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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Old 10-31-2006, 08:25 AM
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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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Old 10-31-2006, 04:48 PM
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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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Old 10-31-2006, 05:22 PM
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Refinsih the stock or get $3,200 3.4 98mm
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Old 11-01-2006, 10:48 AM
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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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Old 11-02-2006, 11:00 AM
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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
Old 11-02-2006, 11:14 AM
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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.
Old 11-03-2006, 06:52 PM
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Quote:
Originally posted by JoeMag
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.
They do bolt right in. Just be sure to get the viton o-rings that fit in the base of the barrels. Otherwise they will leak oil a bit.
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'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, 8:41 R&P
Old 11-04-2006, 01:16 PM
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