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porscheboy1
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911 3.0 rebuild
Hi guys, I have aquired a 1978 911 SC that I am rebuilding and restoring. I have done two 356's but this is my first 911. I have the engine out and completely dis-assembled except for the cylinder heads. Everything is clean inside and the crank, rods, cylinders and pistons mike within specs. However there are seven broken cylinder studs, all on the exhaust side. The top studs are all good. The top studs are magnetic and I assume carbon steel. The bottom studs are non magnetic. I will have case savers installed for the bottom studs and am thinking of keeping the top studs as they are. What type of studs should I put in the bottom exhaust side? I plan on getting rid of the CIS injection and going to PMO carbs, keeping the pistons and cylinders with new rings and SSI exhaust. Haven't thought much on what to do with the cams. They are four bearing cams. This will be a street car and I would like a nice torquey engine. I will to keep the red line under 7000. Your advice will be much appreciated. Regards, John
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03-08-2011, 06:26 PM
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Registered
Join Date: Jan 2004
Location: CT
Posts: 11,567
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John
You will want to replace the bottom studs with the same steel studs you have on the top. You can reuse your steel top studs.
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Tom Butler 1973 RSR Clone 1970 911E 914-6 GT Recreation in Process |
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03-09-2011, 01:39 AM
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Registered
Join Date: Oct 2008
Location: Nash County, NC.
Posts: 8,522
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Like Tom said, put steel in the bottom. Case saving is for magnesium not aluminum because the aluminum threads dont deteriorate. Just unscrew the dilivars and runin the new steel studs with some locktite so they stay. Be sure to check your depth.
Bruce |
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03-09-2011, 04:20 AM
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Less brakes, more gas!
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Yep, regular steel studs are fine. take an old stud part and slice it longitudinally in the threads a few places with a dremel cut off disc. then you can use it as a thread cleaner. Do not use a tap unless it is specifically designed as a cleaning tap (most are cutting taps=bad).
Also, if you don't change the pistons you wont get near the most out of the cam and PMO setup. CIS pistons are fairly shallow in the valve pockets, poorly shaped for carbs, and do not allow much valve lift. This is pretty limiting when you are running carbs. Forgive me if this is an intermediate step on a grander plan, but I would recommend you re-consider your development plan slightly  with regards to that stuff Best regards, Michael
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 Michael '82 Euro SC 'Track Rat' 22/29 Hollows, 22/22 Tarrets, Full ERPB F/R, Rennline Tri Brace, Glass bumpers, Pro 2000's, 5 pts, blah blah blah '13 Cayenne GTS |
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03-09-2011, 04:46 AM
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Less brakes, more gas!
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Oh, John.... I forgot! WELCOME to the board!!
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Michael '82 Euro SC 'Track Rat' 22/29 Hollows, 22/22 Tarrets, Full ERPB F/R, Rennline Tri Brace, Glass bumpers, Pro 2000's, 5 pts, blah blah blah '13 Cayenne GTS |
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03-09-2011, 04:49 AM
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Welcome John. 3.2 SS just do it.
Shane
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78’ SC 911 Targa - 3.2SS, PMO 46, M&K 2/2 1 5/8” HEADERS, 123 DIST, PORTERFIELD R4-S PADS, KR75 CAMS, REBEL RACING BUSHINGS, KONI CLASSICS |
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03-09-2011, 10:50 AM
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porscheboy1
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Thanks everyone for the welcome. Shane, you have a beautiful car.
John |
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03-09-2011, 07:36 PM
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Ugly Betty
Stella
