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Date:         Tue, 10 Feb 2009 20:42:04 -0800
Reply-To:     John Bange <jbange@GMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         John Bange <jbange@GMAIL.COM>
Subject:      Re: Mocal sandwich plate plus oil cooler equals overcooling
In-Reply-To:  <m13ael67fw.fsf@cs.indiana.edu>
Content-Type: text/plain; charset=ISO-8859-1

> I don't know what "too hot" is where oil is concerned, but 220 F under > heavy load does not sound very hot to me. I'd think that's surely > within the limits of any good conventional oil, to say nothing of > a synthetic such as Mobil 1.

Well yeah, 220F is certainly a perfectly reasonable temperature, but It's also probably a highly optimistic reading. It's a long run to the sensor, and the sensor is in the oil drain plug, which sits on the coolest oil in the whole engine. The real internal oil temp is probably 10 degrees hotter, and the engine is hot enough to boil my coolant when I shut it off. It's not a heavy, rolling boil (except the one time I was at 9000ft altitude), but it's a pretty good burble up to the pressure tank, and my oil pressure is under 10psi at idle. Even if it's within limits, it's still better if the oil temperature can be kept consistent. I do use synthetic oil, and the oil can surely handle the heat, but the closer you can keep an engine to ideal operating temperature (somewhere from 180-200, depending on who you ask) the better.

> This is what I am always afraid of when I'm tempted to "outsmart" the > professional automotive engineers who designed the stock system.

Well.... as I've noted before, there's a heck of a lot about Vanagon engineering that demands "outsmarting".

-- John Bange '90 Vanagon - "Lastwagen" '90 Vanagon GL - "Wiesel"


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