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Registered
Join Date: Feb 2005
Location: LA
Posts: 1,183
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Rough 7R - opinions
I have a rough looking 7R Mag case that id like opinions as to using it for my rebuild. All journals measured in 3 locations, averaged and within spec. My concern is the rough finish and some deep pitting inside the bottom of the case by the oil sump plate. I thought I may be able to fill these with JB or Weicon titanium repair stick.
Opinions       
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09-13-2017, 03:49 PM
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Join Date: Apr 2016
Posts: 1,176
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Since I build Mezger cases you will probably think I have a vested interest in this discussion, but I want to tell you honestly that in my development period for these cases, me and my engineers and toolmakers have looked at dozens upon dozens of cases.
I have NEVER seen a case that is that bad. I personally would not build a motor out of that case. Mag 7R cases are somewhat easy to find; I would find a better example. |
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09-13-2017, 03:59 PM
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Under the radar
Join Date: May 2007
Location: Fortuna, CA. On the Lost Coast near the Emerald Triangle
Posts: 7,129
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The big question is. Would someone abandon a good 7R case? Must be a reason for it to have been discarded. Any history on this case?
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Gordon ___________________________________ '71 911 Coupe 3,0L outlawed #56 PCA Redwood Region, GGR, NASA, Speed SF Trackrash's Garage :: My Garage |
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09-13-2017, 04:53 PM
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Join Date: Jul 2001
Location: Portland Oregon
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I've seen a few myself and this one would be placed in the metal recycling barrel.
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Steve Weiner Rennsport Systems Portland Oregon (503) 244-0990 porsche@rennsportsystems.com www.rennsportsystems.com |
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09-13-2017, 05:20 PM
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Join Date: Jul 2001
Location: mt. vernon Wa. USA
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That is a crusty mother......I have never seen a case that bad............I'd replace that and move on.
regards, al
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[B]Current projects: 69-911.5, Previous:73 911X (off to SanFrancisco/racing in Germany).77 911S (NY), 71E (France/Corsica), 66-912 ( France), 1970 914X (Wisconsin) 76 911S roller..off to Florida/Germany RGruppe #669 http://www.x-faktory.com/ |
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09-13-2017, 05:59 PM
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Join Date: May 2004
Location: Boulder, Colorado
Posts: 7,275
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Hurricane damage from way back? Car drove into the ocean? Case set out in a sea side back yard. Or is salt water not that much a corrosive agent for this mag alloy?
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09-13-2017, 06:32 PM
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Join Date: Apr 2007
Location: wisconsin
Posts: 2,553
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Sandblast it, then make a coffee table out of it....
There are supposedly aircraft welders that weld magnesium. There was a thread on here a while ago about someone in Wisconsin welding the fan units... |
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09-13-2017, 06:37 PM
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Registered
Join Date: Feb 2005
Location: LA
Posts: 1,183
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Thanks for all the feedback. History - water and remaining oil sat in the bottom end for what appears to be a very long time. I sourced it for the crank which measured absolutely perfect; hatch marks could still easily be seen on the cylinder walls that hadnt corroded. My guess is the car was wrecked early in life and abandoned.
Last edited by GotaT; 09-13-2017 at 06:53 PM.. Reason: Update |
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09-13-2017, 06:51 PM
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My Garage
1971 Porsche 911
Baja Bug
