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Cylinder studs - Dilivar or gray steel?
What's a good reliable choice for cylinder studs for rebuilding a 3.2? (I don't want the expense of Raceware and I don't plan on tubocharging)
Divilar or standard gray steel? |
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01-29-2004, 06:17 PM
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Steel
Edit - I guess I should elaborate - dilivar has better thermal expansion properties, but is prone to corrosion. This may or may not be a concern, depending on how long you keep the car. When I was rebuilding my 930 engine, I replaced the dilivar with OEM steel. No problems. Your Carrera, I believe, has 12 steel and 12 dilivar. Someone correct me if I'm wrong. It would be OK to replace just the 12 dilivar.
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993 Last edited by cowtown; 01-29-2004 at 06:29 PM.. |
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01-29-2004, 06:20 PM
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Good question. I'm about to replace all of mine.
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1987 911 Guards Red Targa, nearing 200,000 miles, lowered, 7's & 8's, 964 grind cams from John Dougherty, A.P.E. Mass Flow Sensor with chip to match, cat bypass, strut brace, dual out muffler. Will consider newer model in 8 years when I turn 75 and then maybe not. 2012 BMW 528i (wife's) 2007 Toyota FJ (rain and off road days) |
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01-29-2004, 08:30 PM
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Friend of Warren
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Location: Lincoln, NE
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Wayne and John Walker both recommended I go with steel uppers and lowers on my 3.2 so that is what I did.
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Kurt V No more Porsches, but a revolving number of motorcycles. |
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01-30-2004, 06:12 AM
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993 Studs... Steel ones. Cheap and reliable.
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Chris ---------------------------------------------- 1996 993 RS Replica 2023 KTM 890 Adventure R 1971 Norton 750 Commando Alcon Brake Kits |
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01-30-2004, 06:58 AM
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I followed John Walkers advice on my 3.0 too. Steels on the bottom. Same part number as the ones used on the intake side.
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John Adams 1980 ROW 911SC |
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01-30-2004, 08:54 AM
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OK, standard steel looks like the ticket. Wait a minute, I remember VW's needed something called case-saver inserts to handle the additional pulling forces on the studs. Since the steel studs will not lengthen like the OEM Dilivars when hot would case savers be a good idea and are they available?
Thanks! Last edited by movin; 02-01-2004 at 02:55 PM.. |
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01-30-2004, 09:16 AM
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3.2's DO come with 12 steel and 12 Dilivar..
Save some $ and replace only the 12 Dilivar with steel...factory / ARP / or Raceware.... --Wil Ferch
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Wil Ferch 85 Carrera ( gone, but not forgotten ) |
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01-30-2004, 09:54 AM
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Quote:
Ingo
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1974 Targa 3.6, 2001 C4 (sold), 2019 GT3RS, 2000 ML430 I repair/rebuild Bosch CDI Boxes and Porsche Motronic DMEs Porsche "Hammer" or Porsche PST2, PIWIS III - I can help!! How about a NoBadDays DualChip for 964 or '95 993 |
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01-30-2004, 09:59 AM
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No offense intended, but a set of Raceware studs is relatively inexpensive insurance when compared to the hassle of having to remove a broken one.
When building racing or street engines (including V-8's in the past), I have always used either ARP of Raceware and have never had a broken fastener. Lindy Last edited by Lindy; 01-30-2004 at 11:17 AM.. |
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01-30-2004, 11:12 AM
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Friend of Warren
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I've never heard of a broken steel stud on a street driven 3.2!
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Kurt V No more Porsches, but a revolving number of motorcycles. |
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01-30-2004, 11:14 AM
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OK, standard steel looks like the ticket. Wait a minute, I remember VW's needed something called case-saver inserts to handle the additional pulling forces on the studs. Since the steel studs will not lengthen like the OEM Dilivars when hot would case savers be a good idea and are they available?
Thanks! |
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02-01-2004, 02:57 PM
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Casesavers/Timeserts are commonly used on the magnesium cases, but not so much on the aluminum cases (like yours).
I just cleaned up the threads with a tap and then installed the steel studs on my 930 engine (with red Loctite).
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993 |
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02-01-2004, 03:05 PM
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what is the best to go with on a 2.7 with a turbo on it? i have the black coated dilivars but the coating is comming off? im a wd for arp but i was told not to use those on mag cases?
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02-01-2004, 08:46 PM
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Birel:
Probably steel in combination with Time-Certs... Turbo 2.7 ? ... yeow !! ---Wil Ferch
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Wil Ferch 85 Carrera ( gone, but not forgotten ) |
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02-02-2004, 06:09 AM
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About cleaning the threads: Are you folks using a bottom tap? If so, how are you removing any swarf at the bottom of the threaded section?
John
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'78 Targa in Minerva Blue |
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02-02-2004, 07:12 AM
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1970 Porsche 911 S 
1980 Porsche ROW 911SC 3.0L
1974 Porsche 911 Targa 3.6
