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3 restos WIP = psycho
Join Date: Feb 2005
Location: North of Exit 17
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I believe they are cast as Aluminum Silicon alloy all the way through.
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- 1965 911 - 1969 911S - 1980 911SC Targa - 1979 930 |
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09-12-2005, 06:56 AM
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Join Date: Mar 2002
Location: Grove City, OH
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From all of the folks that I have spoken with, yes. Hypereutechtic (sp?) T-390 alloy. Alloy=all the way through.
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AKA: Dr Evil on the 914World forum, need your tranny rebuilt, or want a "How to rebuild your transmission DVD" set? PM me. -74 914 with 74 2.7 CIS -74 VW Bus with modified 3.1 corvair engine and 3.0 CIS fuel injection system. -74 BMW R90 |
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09-12-2005, 07:19 AM
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Location: City of Seattle, WA
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yeah, but aren't they etched to make the surface mostly si?
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Andy |
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09-12-2005, 01:25 PM
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Location: Grove City, OH
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I think that if you treat the freshly board out cylinders with one of the proven methods described in this thread then you would get the desired finish.
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AKA: Dr Evil on the 914World forum, need your tranny rebuilt, or want a "How to rebuild your transmission DVD" set? PM me. -74 914 with 74 2.7 CIS -74 VW Bus with modified 3.1 corvair engine and 3.0 CIS fuel injection system. -74 BMW R90 |
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09-12-2005, 02:10 PM
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Location: Texas
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This thread has given me confidence to re-ring my Alusils but I have a question for the experts on the list. Goetze part number 08-320900-10 interchanges to both of the Porsche OE numbers for Nikasil/Alusil. But the factory spec book say the groove 3 piston rings for are different. For Nikasil "bevelled edge oil control ring with hose covered spring, not chrome plated." For Alusil "double bevelled oil control ring with hose covered spring, chrome plated." Is this a meaningful difference?
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Bill M 88 Carrera 86 944 SP1 06 Cayman SPC |
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01-10-2006, 05:17 PM
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Hi zzwhm. I started this thread (what seems a lifetime ago!) and my Goetze rings are still going strong. I work for Goetze so had lots of help from our engineers at the time.. I've prob covered around 8-10000 miles since, and if I had to make the same decision again, I'd do the same...
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3.2 Coupe |
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01-11-2006, 11:58 AM
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Slumlord
Join Date: May 2001
Location: Canada
Posts: 4,983
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I still have my alusil cylinders out for 'honing'. Then "ll send them back to Adam R for re-measuring the surface roughness. I'm embarrassed about how long this is taking.
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01-11-2006, 12:12 PM
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Location: Texas
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Nathan M -
Thanks for the update. I plan to use Goetze and am glad to know that they are working great for you and so many others. But when I saw the difference in the Nikasil and Alusil oil rings described in the the Porsche spec book it made me wonder if it is meaningful. Maybe one of your engineers could comment on this? Bill
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Bill M 88 Carrera 86 944 SP1 06 Cayman SPC |
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01-11-2006, 04:28 PM
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They'd already confirmed they are suitable for both...
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3.2 Coupe |
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01-12-2006, 02:05 PM
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Yes, alusil cylinders are consistent all the way through the part. KS has another product - tradename, Lokasil - which is alloy all the way through but has a different mix of silicon localized at the cylinders.
Yes, you can overbore alusil cylinders, as William pointed out the problem lies in sourcing pistons. To be suitable the skirts need to be tin and iron plated. An engineer at KS suggested that perhaps graphite might work but hadn't tried. For 95 mm cylinders he said 98 mm was max overbore, any larger and the cylinder walls become too thin. Not sure what the max size would be for a 2.7. Best method is to overbore to another (alusil) stock or readily available replacement size if possible. Or you could find a plating company to treat JEs. The specs for the plating are in the thread. I'm amazed this thread is still going strong. For those who haven't yet, please scan through it. There's a LOT, I mean really, tons of good info, hard work and research in here. Not to mention a little drama.
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anh911 '94 Dakota - Meh '98 Moto Guzzi - woo hoo 911; XJS; Islander 36; All Sold '97 YZF1000RJ - Totaled (Not by me) |
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01-12-2006, 02:14 PM
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Join Date: Mar 2003
Location: Darnestown, Maryland
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Well, I hate to report that after about 10,000 miles my engine outlasted the car. I wrecked it in November. The engine will be transplanted into an new test vehicle for further abuse! (Hopefully my brother's 73.5 longhood targa!)
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Bill Miller 81 Targa Guards Red 3.6, M&K 1 out, S4 brakes 83 ROW CAB Rubinrot Metallic (RIP) |
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01-12-2006, 07:43 PM
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Location: Grove City, OH
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My condolences. I am glad that you are seemingly ok.
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AKA: Dr Evil on the 914World forum, need your tranny rebuilt, or want a "How to rebuild your transmission DVD" set? PM me. -74 914 with 74 2.7 CIS -74 VW Bus with modified 3.1 corvair engine and 3.0 CIS fuel injection system. -74 BMW R90 |
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01-12-2006, 08:11 PM
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Join Date: Mar 2003
Location: Darnestown, Maryland
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Thanks, and this is am oppertunity. Next project is an 81 with a 3.6 conversion.
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Bill Miller 81 Targa Guards Red 3.6, M&K 1 out, S4 brakes 83 ROW CAB Rubinrot Metallic (RIP) |
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01-13-2006, 06:58 AM
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Irrationally exuberant
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Measuring cylinders with electron microscope - only on Pelican!
Quote:
-Chris
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'80 911 Nogaro blue Phoenix! '07 BMW 328i 245K miles! http://members.rennlist.org/messinwith911s/ |
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03-27-2006, 04:01 PM
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Who is John Galt?
Join Date: Jun 2003
Location: Knoxville, TN
Posts: 638
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I sent the cylinder back a few months ago.
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'79 911sc Targa '02 slk230 kompressor '84 Tamiya Falcon A democracy cannot exist as a permanent form of government. It can only exist until the voters discover that they can vote themselves largesse from the public treasury. From that moment on, the majority always votes for the candidates promising the most benefits from the public treasury with the result that a democracy always collapses over loose fiscal policy, always followed by a dictatorship. The average age of the world's greatest civilizations has been 200 years. |
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03-27-2006, 06:12 PM
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Irrationally exuberant
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Quote:
-Chris
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'80 911 Nogaro blue Phoenix! '07 BMW 328i 245K miles! http://members.rennlist.org/messinwith911s/ Last edited by ChrisBennet; 03-28-2006 at 05:03 AM.. |
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03-27-2006, 06:52 PM
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Slumlord
Join Date: May 2001
Location: Canada
Posts: 4,983
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I sent the cylinder for 'polishing' weeks ago. He keeps telling me it will be 'a few more days'. It will get done.
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84 Cab - sold! 89 Cab - not quite done 90C4 - winter beater |
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03-28-2006, 04:28 AM
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Who is John Galt?
Join Date: Jun 2003
Location: Knoxville, TN
Posts: 638
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Quote:
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'79 911sc Targa '02 slk230 kompressor '84 Tamiya Falcon A democracy cannot exist as a permanent form of government. It can only exist until the voters discover that they can vote themselves largesse from the public treasury. From that moment on, the majority always votes for the candidates promising the most benefits from the public treasury with the result that a democracy always collapses over loose fiscal policy, always followed by a dictatorship. The average age of the world's greatest civilizations has been 200 years. |
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03-28-2006, 03:56 PM
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Join Date: Oct 2003
Location: Bremerton, WA
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What has been the experiences of re-ringed alusil and the different honing methods. someone out there should have a few miles built up.
Thanks in advance
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1983 911SC 1977 911S "parting out" |
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05-17-2006, 11:57 AM
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Slumlord
Join Date: May 2001
Location: Canada
Posts: 4,983
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My cylinder is ready for pick-up. Within a few days I will mail it to Rondinone for examination. I can't believe how long this took...
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84 Cab - sold! 89 Cab - not quite done 90C4 - winter beater |
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05-17-2006, 11:59 AM
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1989 Porsche 911 Carrera 3.2
The Blue Pheonix
