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Date:         Tue, 19 Feb 2002 03:26:18 EST
Reply-To:     FrankGRUN@AOL.COM
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Frank Grunthaner <FrankGRUN@AOL.COM>
Subject:      Re: distilled water & wbx reliability
Comments: To: mike.moery@acsalaska.net
Content-Type: text/plain; charset="US-ASCII"

Mike,

At one time I was much younger. In those days, I was planning to turbocharge the Vanagon diesel. I didn't want to tear down the engine to add oil squirters, etc, etc. So I researched the cooling system question. (we're talking somewhere around 1987) I found the Evans system, contacted them and was very impressed. At their installation, I did a series of thermal images (HgCdTe camera no less) of a turbocharged VW 1.8L 8V engine being run out on a dyno. The thermal uniformity of the head was amazing (less than 2 degrees as I recall). In another area, I mapped another turbo VW pulling less boost and putting out less power, water/ethylene glycol cooled. Hot spots everywhere. Moved around with rpm and load, but thermal variations were well over 20 degrees (most we could map in an image then).

I designed a system with them, and was ready to go. Had an IC reliability crisis on one of the major deep space missions and the summer was gone before I blinked. I resurrected the ideas when I did the Gasoline I-4 conversion. But never quite needed the pushup. I was thinking about it again with the Audi Turbo 3A engine, but more power will surely trash the transmission.

Its a superb system, now race proven, and probably a good WBX enhancement. Thermal uniformity in the head -- good. Hot spots - bad.

I'll try to find my notes and drawings again. The key was the location of the leveling reservoir. I was going to put it in the rear wall, passenger side, where later models put the rear wiper washer tank.


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