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Date:         Sun, 17 May 1998 20:00:22 -0500
Reply-To:     "Mark B. Magee" <condor2@FLASH.NET>
Sender:       Vanagon Mailing List <Vanagon@vanagon.com>
From:         "Mark B. Magee" <condor2@FLASH.NET>
Organization: Condor Efficiency
Subject:      Re: Lowering Coolant Pressure for Headgaskets
Comments: To: "harald.nancy" <harald.nancy@MCI2000.COM>
Comments: cc: Vanagon@VANAGON.COM
Content-Type: text/plain; charset=us-ascii

harald.nancy wrote:

> Steven X. Schwenk theorized: > > > > Is this an old already rejected theory? Wouldn't running the engine say > > 10% cooler...or any cooler than stock set up, have some adverse > > consequences? > > I replaced my 87c thermo on my '90 vanagon with a 80c degree > thermostat. I haven't noticed any adverse affects. Does not make > very much of a difference, except during freeway cruising, temp needle > stays a bit lower than it used to. > Oil temperature seems to stay a bit lower too. Fuel mileage is the same. > In stop and go traffic, temp rises until fan goes on, as before.

Running a cooler temp thermostat can work against you. Remember, the entire Digifant system is reliant upon 195 deg F water temp for proper (ops normal) feedback to the ECU. Anything lower than this and the ECU would try to compensate by for instance changing ignition timing to achieve the desired or anticipated O2 temp. Now there should be some window of float that are acceptable to the ECU, I don't know what those are, but I would be careful changing thermostat temp ratings in any Electronic Fuel Injected engine, for it has a potential to introduce a "feedback mechanism" of correction back to what the ECU knows to be the norm. Additionally, lowering coolant temps and pressures would have little bearing on the head gasket issue. The issue is the corrosion, not pressure. And the pressure comes from the other side in a failure, that is the combustion side. ><> ><> ><> ><> ><> ><> ><> ><> ><> Shalom Mark B. Magee 82 Diesel Westy 87GL 91 Westy 96 Suzuki 4WD Sport Kemah TX USA John 14:6


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