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Registered
Join Date: Mar 2004
Location: Higgs Field
Posts: 22,584
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Broken Cylinder Fins
I just got a set of reconditioned 95mm cylinders on exchange from an extremely reputable shop. All but one were perfect, but one has a few small pieces of the upper fins missing. I think it is just fine to use, but I wanted to run it past you folks. What do you all think?
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Jeff '72 911T 3.0 MFI '93 Ducati 900 Super Sport "God invented whiskey so the Irish wouldn't rule the world" |
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07-09-2007, 04:44 PM
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Mark S
Join Date: Jun 2004
Location: New Mexico
Posts: 516
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No big deal, run it.
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07-09-2007, 06:53 PM
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Registered
Join Date: Sep 2005
Location: Winnipeg, MB Canada
Posts: 221
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In my opinion:
It will be ok. If you have the pieces you could use a little liquid metal to put the pieces back on. Not perfect but it will work. If you dont have the pieces its not the end of the world. (cylinder will have a hot spot) Kirk
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1989 911 Carrera 4 (964) Last edited by kirkf; 07-10-2007 at 10:20 AM.. |
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07-09-2007, 07:13 PM
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Join Date: Aug 2006
Location: Los Osos, Ca
Posts: 398
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I think I'd ask for another.
If they offered enough of a discount, I'd run it, but I'm a cheap bastard. |
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07-09-2007, 08:59 PM
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Moderator
Join Date: Dec 2001
Posts: 9,569
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I wouldn't use it. I don't know what the loss of cooling is, particularly in light of the fact that the factory itself used half-fin cylinders (a disaster), but it's just not a good idea to put a known broken part back into an engine you have gone to the trouble to tear down and rebuild.
If it were a four-cam Carrera part that was unobtainable, it might make sense to fix. But a spare cylinder shouldn't be hard to find at all.
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'66 911 #304065 Irischgruen ‘96 993 Carrera 2 Polarsilber '81 R65 Ex-'71 911 PCA C-Stock Club Racer #806 (Sold 5/15/13) Ex-'88 Carrera (Sold 3/29/02) Ex-'91 Carrera 2 Cabriolet (Sold 8/20/04) Ex-'89 944 Turbo S (Sold 8/21/20) |
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07-10-2007, 06:29 AM
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Irrationally exuberant
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See if they'll exchange it.
-Chris
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'80 911 Nogaro blue Phoenix! '07 BMW 328i 245K miles! http://members.rennlist.org/messinwith911s/ |
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07-10-2007, 09:00 AM
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Join Date: Jul 2001
Location: Portland Oregon
Posts: 7,007
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Hi Jeff:
Those fins are missing from the hottest running part of the cylinder and I would not use it. Its hard enough keeping these bores round at operating temperature and the missing fins at that juncture will accentuate ovality when hot. You can see this by observing hot leakdown figures after its been in service for awhile,......  Just one person's opinion so take it for what its worth.
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Steve Weiner Rennsport Systems Portland Oregon (503) 244-0990 porsche@rennsportsystems.com www.rennsportsystems.com |
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07-10-2007, 09:25 AM
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Join Date: May 2003
Posts: 3,346
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Steve's opinion is worth alot IMO. I guess for me it would depend on the application. You don't say what kind of engine or type of use you have in mind. For a street car stock SC I would use it if I didn't have an easy alternative. For a race motor or turbo motor I'd find another one.
-Andy
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72 Carrera RS replica, Spec 911 racer |
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07-10-2007, 04:36 PM
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The Blue Pheonix
