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Join Date: Mar 2007
Location: asheville
Posts: 205
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Nikasil re-ring
Howdy, I am currently in the process of having an 87 carerra 3.2 motor rebuilt. It smoked from day one and I got quite sick of this. My question is this: how important is it to have new cylinders and piston installed versus new rings? The motor had 140k on it and two rings were broken. Upon my visual inspection, the cylinders looked okay, but I was told that re-rings never properly seal. Am I being mislead? I would appreciate any help on this.
Thanks C
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Carl F 2000 Ruby Red Dodge Stratus with high performance racing stripe SE edition WTF? (sadly gone, but not forgotten) 1997 HOnda Accord "Shaggin Wagon" 1987 All black Targa 1998 Lemond Zurich/Dura Ace 2005 Jamis Dakar Sport 2006 Lemond Reno 2 DOgs , 2 Cats, Shi@ton of fleas 1 Cool as Hell Wife that tolerates my stupidity |
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03-27-2007, 05:56 PM
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Join Date: Jul 2001
Location: Portland Oregon
Posts: 7,007
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Hi:
Seating new rings in used Nikasil cylinders is a bit of a crapshoot; sometimes they do and sometimes, not. Even after careful cleaning and preparation of the cylinder walls, it can be a challenge to get them seated and I'd recommend using an engine dyno if you can get access to one.
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Steve Weiner Rennsport Systems Portland Oregon (503) 244-0990 porsche@rennsportsystems.com www.rennsportsystems.com |
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03-27-2007, 10:51 PM
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Location: Northern CA
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Steve,
Now I'm worried...I reringed my Nikasils, Jerry Woods did the prep. and put the rings on. That was 10k miles ago...car seems to run good but I had low compression when I did a straight compression check. Maybe the engine wasn't hot enough... any way how should I check this again? I've done some track days and drive daily and it seems to run fine. Thanks, -Henry 89 911 3.2 now with 84k miles
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Sold: 1989 3.2 coupe, 112k miles |
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03-28-2007, 05:58 AM
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Location: Portland Oregon
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Hi Henry:
LOL,..The two best indicators of good ring seating are leakdown tests and oil consumption. As long as those are OK, I would not worry about it at all.
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Steve Weiner Rennsport Systems Portland Oregon (503) 244-0990 porsche@rennsportsystems.com www.rennsportsystems.com |
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03-28-2007, 08:38 AM
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Join Date: May 2003
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With the fact that you already had broken rings I suspect your pistons are worn enough that they aren't good candidates for a re ring. If they measured good then re-ringing is an option. I can understand a shop not wanting to guarantee that they would seat though.
-Andy
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72 Carrera RS replica, Spec 911 racer |
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03-28-2007, 07:03 PM
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It sounds to me like it might be more hassle than it is worth. Although I might save three grand if they work, that money could be lost if the rering doesn't and they have to remove the motor again. Any ideas of what to do with the used pistons and cylinders?
thanks Carl
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Carl F 2000 Ruby Red Dodge Stratus with high performance racing stripe SE edition WTF? (sadly gone, but not forgotten) 1997 HOnda Accord "Shaggin Wagon" 1987 All black Targa 1998 Lemond Zurich/Dura Ace 2005 Jamis Dakar Sport 2006 Lemond Reno 2 DOgs , 2 Cats, Shi@ton of fleas 1 Cool as Hell Wife that tolerates my stupidity |
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03-29-2007, 02:48 AM
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Join Date: May 2003
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You did get 140k miles out of the old ones. Don't feel too bad. You can sell the old set on here or e-bay. Someone might try them for a race engine or just the cylinders for a race engine.
-Andy
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72 Carrera RS replica, Spec 911 racer |
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03-29-2007, 03:25 PM
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