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Registered
Join Date: Jul 2008
Location: Spokane WA
Posts: 585
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Another Alusil Conundrum
89 3.2 120k mi. Alusil bores look excellent, no scratches or scuffing but no crosshatching visible. I am reluctant to take the pistons out of the cylinders to measure them because of fear of the rings not seating upon reassembly. Most say not to re-ring Alusil but some say ok to reuse with old rings if not disturbed.
So right now I'm trying to decide my course of action here with the following options: 1) Do not disturb the rings in the bores, reuse and hope for the best 2) Disassemble the pistons & rings, measure bores, pistons and ring groove clearances then, if in spec, reassemble and hope the rings seat ok. 3) Buy a good used set of Mahle nikasil P's & C's, clean up with scotchbrite and install new rings. 4) Have my alusil bores replated with nikasil and use new JE pistons (about $2k) 5) Bite the bullet and buy a new set of Mahle P's & C's (about $4k)  What say you Pelican Brain Trust?? 
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03-22-2012, 04:44 PM
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Join Date: May 2003
Posts: 3,346
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I've used a couple of sets of Alusils on my race motor. Old rings once and new rings the second time. Both sets worked fine. I would at least take apart 1 piston to check the wear. This last engine rebuild, I bought some used Nickasil cylinders and bought some pistons from Jeff Gamroth at Rothsport in Portland. You send him the used cylinders and he has them honed to make them even all along the length and fits billet pistons to them. He can set you up with Euro pistons and instructions for Deck height to get about 9.8 compression. I think it was around 2000 dollars plus the donor cylinders.
-Andy
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72 Carrera RS replica, Spec 911 racer |
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03-22-2012, 07:42 PM
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It is fine to re ring alusil cylinders. They get a bad name when people improperly replace the pistons with non "ferrocoated" replacements which cause scoring to the cylinders. I also can remember many other " do it yourselfers " who take bottle hones to the cylinders when doing a re ring, this cannot be done to Alusil. With alusil simply clean the cylinders well and re ring. Also make sure you check and adjust ring gap as neccesary.
Barry |
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03-26-2012, 07:15 PM
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Registered
Join Date: Jul 2008
Location: Spokane WA
Posts: 585
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I didn't want to take a chance with such a key element of my rebuild so I found an excellent price on a brand new set of Mahle nikasil P's & C's. Overkill, maybe, but all I've read says the re-ring with Alusils is chancy at best as to whether the new rings will seat properly. For those of you who believe they will I have a nice used set of Alusils for sale
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03-26-2012, 07:28 PM
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