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Date:         Fri, 1 Aug 2014 06:30:56 -0500
Reply-To:     mcneely4@COX.NET
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Dave Mcneely <mcneely4@COX.NET>
Subject:      Re: Roll your own...
Comments: To: Alistair Bell <albell@shaw.ca>
In-Reply-To:  <ZFJ11o0102zL6ds01FJ23N>
Content-Type: text/plain; charset=utf-8

---- Alistair Bell <albell@shaw.ca> wrote: > How many different metals Dave? > > I see black iron pipe, galvy pipe, a brass hose barb and maybe a brass bushing.

The concern was addressed practically in that the corrosion is all external to the fitting. Not keeping all the electronegativity values in my head like you (probably less reason to do so for me, day to day), I just generally prefer to steer away from combining metals in a potentially (pun intended) corrosive environment. But you know the theory better than I do. I guess every time I see metals combined any more, I am reminded of the medical engineers who built an artificial hip joint of different metals and caused a fair amount of difficulty for patients and physicians before the product was withdrawn from the market.

Thanks for straightening me out on this case.

mcneely

> > The iron is fine, you have that already in the engine in the form of the cylinders, the brass is present in sensors, the galvy T's? Well the zinc shouldn't be a problem. > > If I was to be picky I would say the stainless replacement would be more of an issue. The stainless will be the most noble metal in the system so conventionally the rear of the metal in the system, if electrically bonded, will corrode. But complicating the issue is that the coolant is anoxic so the stainless corrosion resistance has no value as it relies on an oxygen environment to create its protective layer. So then the nobility of the stainless decreases. > > Sure, the stainless version will look great on the outside. But on the inside you are now relying on the anti corrosion components of the coolant to protect the stainless. > > It's so complicated to imagine the scenarios, it's not worth worrying about. > > But... I wish they had an aluminum version of the distribution tower :) > > Alistair > > > > > > > On Jul 31, 2014, at 10:47 AM, Dave Mcneely <mcneely4@COX.NET> wrote: > > > > Hmmm...... . Lots of different metals there, I see. But, it worked for you, despite the corrosion. Good for you. mcneely > > > > ---- Angus Gordon <birdworks@GMAIL.COM> wrote: > >> It's pretty much all Alistair's fault. If you follow his blog you know what I mean - all these nifty little parts carefully crafted out of stainless steel adorning his Syncro. His cooling system pH adjusted and electrolytically neutralized to prevent stray electrons from damaging the framus. I've come to realize that my syncro represents the antithesis of that approach. > >> > >> So a while back I was putting together an engine to install in it and decided that I really needed to start scraping the rust and grime off things and see if I couldn't make it look nice, as well as function. Here's the result before it went into the syncro - > >> > >> http://birdworks.tumblr.com/post/92103590505 > >> > >> Next, I looked around and couldn't find a single item made of stainless steel on my entire vehicle. Lacking an endless stock of stainless in the shop, along with the machining capabilities to do anything with it, I was left with only one option - order a part from GoWesty. > >> > >> Not that I really needed a part of course; the part I selected was still functioning just fine. I just needed some stainless steel. > >> > >> Back in 1999, according to my records, the plastic coolant distribution piece disintegrated after 13 years of service in my syncro. Being cheap and not willing to be stranded waiting for a part, I went to a nearby hardware store and assembled my own with about twenty minutes work in the plumbing department. Consisting of cast iron, steel, brass, copper, nylon and teflon, it may not impress the coolant system purists, but it did work fine for 15 years. Maybe I'll keep it as a spare. > >> > >> http://birdworks.tumblr.com/post/93405664090 > >> > >> > >> Angus > > > > -- > > David McNeely

-- David McNeely


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