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87 - 911
Join Date: Nov 2010
Location: Ontario, Canada
Posts: 200
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Mahle or KS
Is this a Mahle or a KS cylinder?
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12-04-2010, 10:30 AM
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KS.
My Mahle cylinders have Mahle written across the bottom.
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83 SC Targa -- 3.2SS, GT2-108 Dougherty Cams, 9.5:1 JE Pistons, Supertec Studs, PMO ITB's, MS2 EFI, SSI's, Recurved Dizzy, MSD, Backdated Dansk Sport Stainless 2 in 1 out, Elephant Polybronze, Turbo Tie Rods, Bilstein HD's, Hollow 21-27 TBs, Optima Redtop 34R, Griffiths-ZIMS AC, Seine Shifter, Elephant Racing Oil Cooling. |
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12-04-2010, 10:33 AM
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87 - 911
Join Date: Nov 2010
Location: Ontario, Canada
Posts: 200
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Looked up KolbenSchmidt on the Internet, their corporate logo matched the cast symbol on the right.
Now to decide whether to leave the rings alone or chance that new ones will seat. |
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12-04-2010, 11:52 AM
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87 - 911
Join Date: Nov 2010
Location: Ontario, Canada
Posts: 200
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Sorry, meant to say left
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12-04-2010, 11:53 AM
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Lots of opinions on here on reringing... most are not favorable... it will come down to budget...
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83 SC Targa -- 3.2SS, GT2-108 Dougherty Cams, 9.5:1 JE Pistons, Supertec Studs, PMO ITB's, MS2 EFI, SSI's, Recurved Dizzy, MSD, Backdated Dansk Sport Stainless 2 in 1 out, Elephant Polybronze, Turbo Tie Rods, Bilstein HD's, Hollow 21-27 TBs, Optima Redtop 34R, Griffiths-ZIMS AC, Seine Shifter, Elephant Racing Oil Cooling. Last edited by brads911sc; 12-04-2010 at 12:04 PM.. |
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12-04-2010, 12:01 PM
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87 - 911
Join Date: Nov 2010
Location: Ontario, Canada
Posts: 200
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If it wasn't for the question of money many decisions would be easier.
New cylinder barrels and pistons are out of the question at this point in time. The motor has 100K miles and high oil consumption. The cylinder heads are out for rebuild and I'm left with whether to re-ring while its apart. |
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12-05-2010, 06:06 AM
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Talk to Tom Butler... Tom1394racing. He probably has a complete set of Nikasils to sell you for less than you might think...
Otherwise.. I would probably take the chance and re-ring them...
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83 SC Targa -- 3.2SS, GT2-108 Dougherty Cams, 9.5:1 JE Pistons, Supertec Studs, PMO ITB's, MS2 EFI, SSI's, Recurved Dizzy, MSD, Backdated Dansk Sport Stainless 2 in 1 out, Elephant Polybronze, Turbo Tie Rods, Bilstein HD's, Hollow 21-27 TBs, Optima Redtop 34R, Griffiths-ZIMS AC, Seine Shifter, Elephant Racing Oil Cooling. |
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12-05-2010, 06:50 AM
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Registered
Join Date: May 2009
Location: Around Boston
Posts: 2,051
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Wondering if anybody has heard, seeing or used a set of brand new cast iron P&C that sells on ebay for around 600 bucks.
Any opinions, thoughts? Early P&C are cast iron so why not put them on a 2.7 rebuild? |
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12-05-2010, 07:02 AM
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Talk to Tom. May be able to get a superior set of Nikasil P&C for not much more...
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83 SC Targa -- 3.2SS, GT2-108 Dougherty Cams, 9.5:1 JE Pistons, Supertec Studs, PMO ITB's, MS2 EFI, SSI's, Recurved Dizzy, MSD, Backdated Dansk Sport Stainless 2 in 1 out, Elephant Polybronze, Turbo Tie Rods, Bilstein HD's, Hollow 21-27 TBs, Optima Redtop 34R, Griffiths-ZIMS AC, Seine Shifter, Elephant Racing Oil Cooling. |
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12-05-2010, 11:24 AM
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Registered
Join Date: Jan 2004
Location: CT
Posts: 11,567
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I do have a nice set of 9.3CR Mahle Nikasils on the shelf.
PM me if interested. Thanks
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Tom Butler 1973 RSR Clone 1970 911E 914-6 GT Recreation in Process |
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12-05-2010, 01:49 PM
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Join Date: May 2003
Posts: 3,346
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Pretty low miles on what you have. I'd check the ring end gaps and examine pistons/cylinders for wear. With your miles I'd expect them to all be well within spec and probably better than brand new Goetz rings. If you put everything back the same as it came out you should be fine.
-Andy
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72 Carrera RS replica, Spec 911 racer |
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12-05-2010, 08:35 PM
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Join Date: Jun 2009
Location: Iowa
Posts: 443
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Back in the day we would take 320 wet and dry sand paper with some oil and just scuff the walls lightly with no problems. With a sixty degree or so cross hatch and new rings.
Last edited by Two Rivers; 12-06-2010 at 12:52 PM.. |
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12-06-2010, 12:50 PM
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Schleprock
Join Date: Sep 2000
Location: Frankfort IL USA
Posts: 16,639
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If you've got nothing but time on your hands
 you should read the ridiculously long thread here in the rebuilding forum about re-ringing Alusil cylinders.Re-ring Alusils? While you usually have to take most of what you read on the internet with a grain of salt, there was some pretty good information put together to find out what happens when you throw a hone (hone type varies) against an alusil cylinder
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Kevin L '86 Carrera "Larry" |
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12-06-2010, 03:38 PM
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Join Date: May 2003
Posts: 3,346
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While re-ringing is a possible solution (I've done it myself a couple of times with Alusil), if you use your old rings you aren't "re-ringing" and so you don't have to worry about it. No prep required except a clean up. I'd stick the cylinders in the dishwasher and take the pistons somewhere to get an ultrasonic cleaning.
-Andy
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72 Carrera RS replica, Spec 911 racer |
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12-07-2010, 06:59 AM
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he said he wanted to use new rings (post 3). probably good since he also said he is using alot of oil (post 6).
best scenario is to get a used set of nikasil from Tom. In the end, unless this is a DD, probably worth the wait to do it right... Quote:
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83 SC Targa -- 3.2SS, GT2-108 Dougherty Cams, 9.5:1 JE Pistons, Supertec Studs, PMO ITB's, MS2 EFI, SSI's, Recurved Dizzy, MSD, Backdated Dansk Sport Stainless 2 in 1 out, Elephant Polybronze, Turbo Tie Rods, Bilstein HD's, Hollow 21-27 TBs, Optima Redtop 34R, Griffiths-ZIMS AC, Seine Shifter, Elephant Racing Oil Cooling. Last edited by brads911sc; 12-07-2010 at 07:08 AM.. |
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12-07-2010, 07:06 AM
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87 - 911
Join Date: Nov 2010
Location: Ontario, Canada
Posts: 200
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I read through the entire thread on reusing the Alusil barrels, boy the technology was really brought to bear on that one, electron beam microscopes to scan the surface, holy crap.
Currently I am waiting to hear from the engine builder about the condition of the heads, specifically the valve guides. When I removed the intake manifold there was oil pooled in behind the closed intake valves. This explains the blue cloud of smoke in start up, if the guide wear was severe it could explain the high oil usage. I pulled the piston on the one cylinder that showed low compression, no broken rings and fit is in spec. Left the pistons inside the remaining cylinders. |
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12-12-2010, 12:19 PM
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Join Date: May 2003
Posts: 3,346
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There are two reasons I recommend using the old rings. You avoid the possibility of the rings not seating, and many times the new rings fit worse than the old rings (end gaps out of spec). Of course the pistons and rings should be measured for wear and checked for damage. I just keep the rings sorted out and pistons matched to the rings and cylinders they came from. I even note the position of the end gaps when I remove the pistons but that is probably overkill.
-Andy
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72 Carrera RS replica, Spec 911 racer |
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12-12-2010, 03:08 PM
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