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grateful user
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advise on exhaust stud modification
making a new post on this as my last one was kinda vague , My 82 3.0 started making a popping noise on acceleration, and i knew i'd blown a head gasket,( I've heard this sound before) pulled motor and it was obvious that #3 was leaking compression between head and jug, so i ordered a top gasket kit, while apart, I'm adding 964 cams and my motorsport flywheel thats been sitting on my bench for a year and a complete reseal for some oil leakes. My prob is that i want to change out my long exhaust studs to the shorter ones for my thin flange ssi's,and they will NOT come out without snapping, my thought is to drill em all out and timecert from a 6mm to an 8mm and use allen bolts to hold on exchangers. anyone done this?
 
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fully disassembled, blasted, customized and restored 75 targa with factory hard top, 993 style turbo ft fenders, steel flares, C2 bumpers and rockers, 82 3.0 sc 9.5/1 engine with PMS flywheel, 964 cams, flowed heads, ssi's short geared 915 w/lsd, polybronze, bilstein,working lambda, modified and highly tuned cis, tensioners, pop valve, backdated exhaust and heater, 2300 lbs. no bolt left untouched. 1970 911E. Nice car but needs a re-do. |
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06-02-2009, 12:33 PM
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Registered
Join Date: Jul 2001
Location: Lawrenceville GA 30045
Posts: 7,377
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Drilling out exhaust studs - quick help
how to remove exhaust studs Does anyone sell a fixture for drilling broken exhaust studs and dozens of others...
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Mark '83 SC Targa - since 5/5/2001 '06 911 S Aerokit - from 5/2/2016 to 11/14/2018 '11 911 S w/PDK - from 7/2/2021 to ??? |
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06-02-2009, 01:26 PM
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mark, ive read those before, I have no problems getting out broken studs, done thousands, (worked at a BMW dealer for 16 years) I want to know if i can go to a 8mm threaded timecert so i can put some torque on my headers without worring about twisting off the 6mm that are there now, I think i can, since ive allready started the procedure, only thing i know so far is that ill have to drill out the flanges on the manifold 2 more mm.
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fully disassembled, blasted, customized and restored 75 targa with factory hard top, 993 style turbo ft fenders, steel flares, C2 bumpers and rockers, 82 3.0 sc 9.5/1 engine with PMS flywheel, 964 cams, flowed heads, ssi's short geared 915 w/lsd, polybronze, bilstein,working lambda, modified and highly tuned cis, tensioners, pop valve, backdated exhaust and heater, 2300 lbs. no bolt left untouched. 1970 911E. Nice car but needs a re-do. |
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06-02-2009, 02:52 PM
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looking good, only six more to go. I'll be able to put some torque on these babys now, good bye exhaust leaks.
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fully disassembled, blasted, customized and restored 75 targa with factory hard top, 993 style turbo ft fenders, steel flares, C2 bumpers and rockers, 82 3.0 sc 9.5/1 engine with PMS flywheel, 964 cams, flowed heads, ssi's short geared 915 w/lsd, polybronze, bilstein,working lambda, modified and highly tuned cis, tensioners, pop valve, backdated exhaust and heater, 2300 lbs. no bolt left untouched. 1970 911E. Nice car but needs a re-do. |
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06-02-2009, 03:32 PM
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Registered
Join Date: Oct 2008
Location: Nash County, NC.
Posts: 8,482
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The studs are 8mm not 6mm. The German shop I used for 20 years would insert a 10mm threaded stock and then tap that for 8 mm
Bruce |
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06-02-2009, 03:33 PM
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bruce, mine are 6mm on my 3.0, also on my old 2.7, but that is exactly what im trying to do.
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fully disassembled, blasted, customized and restored 75 targa with factory hard top, 993 style turbo ft fenders, steel flares, C2 bumpers and rockers, 82 3.0 sc 9.5/1 engine with PMS flywheel, 964 cams, flowed heads, ssi's short geared 915 w/lsd, polybronze, bilstein,working lambda, modified and highly tuned cis, tensioners, pop valve, backdated exhaust and heater, 2300 lbs. no bolt left untouched. 1970 911E. Nice car but needs a re-do. |
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06-02-2009, 03:38 PM
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correction
bruce, you are correct, been going at it hard today and just slipped up. Yes, they are 8mm and im taking them to 10mm
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fully disassembled, blasted, customized and restored 75 targa with factory hard top, 993 style turbo ft fenders, steel flares, C2 bumpers and rockers, 82 3.0 sc 9.5/1 engine with PMS flywheel, 964 cams, flowed heads, ssi's short geared 915 w/lsd, polybronze, bilstein,working lambda, modified and highly tuned cis, tensioners, pop valve, backdated exhaust and heater, 2300 lbs. no bolt left untouched. 1970 911E. Nice car but needs a re-do. |
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06-02-2009, 04:08 PM
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Manassas, VA
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So much work...
I used the M8 ARP studs. They went in the stock holes and they will never break. I think they are rated at 170,000 psi tensile strength, "substantially stronger than grade 8" hardware. I gues you could use ARP M10 studs. Wow, talk about bulletproof. Mine are 57mm long for the thick flange, I'm not sure how long you would need for the thin flange. Mark Mark
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1991 964 Polar Silver Metallic Turbo Coupe |
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06-02-2009, 04:40 PM
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Registered
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I know nothing but why the timecerts instead of just drilling and tapping for the larger studs. Thanks.
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Ken in Greer, SC 88 Carrera Coupe 98 C2S Coupe |
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06-02-2009, 05:30 PM
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after staring at it and discussing with my bro Jeff, we are not going to timecert, will be using 10mm allen headed bolts. there is just not enough room to put in a 10 mm timcert, plus, mounting bolts would be to big.
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fully disassembled, blasted, customized and restored 75 targa with factory hard top, 993 style turbo ft fenders, steel flares, C2 bumpers and rockers, 82 3.0 sc 9.5/1 engine with PMS flywheel, 964 cams, flowed heads, ssi's short geared 915 w/lsd, polybronze, bilstein,working lambda, modified and highly tuned cis, tensioners, pop valve, backdated exhaust and heater, 2300 lbs. no bolt left untouched. 1970 911E. Nice car but needs a re-do. |
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06-02-2009, 05:49 PM
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Registered
Join Date: Mar 2001
Location: Marysville Wa.
Posts: 22,431
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long 8mm timeserts and regular 8mm studs will work fine. looks stock and normal that way too. i kinda doubt that the 10mm allen head will pass through the holes in the exchangers, and may also be pretty tight against the actual exhaust pipes.
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https://www.instagram.com/johnwalker8704 8009 103rd pl ne Marysville Wa 98270 206 637 4071 |
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06-02-2009, 06:17 PM
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i actually have the 10mm allens, test fit and they will work great, will be able to put lots of torque to them, but now im worried about thermal expansion properties of the bolts
 will sleep on it, leaning toward 8mm ARP with time cert, more ordering and waiting, have a 980.00 pelican order on the way now, will arrive in a very small package, you know the feeling.
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fully disassembled, blasted, customized and restored 75 targa with factory hard top, 993 style turbo ft fenders, steel flares, C2 bumpers and rockers, 82 3.0 sc 9.5/1 engine with PMS flywheel, 964 cams, flowed heads, ssi's short geared 915 w/lsd, polybronze, bilstein,working lambda, modified and highly tuned cis, tensioners, pop valve, backdated exhaust and heater, 2300 lbs. no bolt left untouched. 1970 911E. Nice car but needs a re-do. |
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06-02-2009, 07:33 PM
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75 Porsche 911
bike
1970 porsche E
1991 Porsche 964 Turbo 3.3L
