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- Newsgroups: rec.autos.vw
- Path: sparky!uunet!charon.amdahl.com!pacbell.com!sgiblab!munnari.oz.au!titan!root
- From: c.oneill@trl.oz.au (Chris O'Neill)
- Subject: Re: Keeping Your Watercooled VW cool.
- Message-ID: <1992Nov16.234700.5188@trl.oz.au>
- Sender: root@trl.oz.au (System PRIVILEGED Account)
- Organization: Telecom Australia Research Laboratories
- References: <8c65TB1w164w@cellar.org> <1992Nov14.213324.1738@wuecl.wustl.edu> <1e4a23INNkjr@fido.asd.sgi.com>
- Date: Mon, 16 Nov 1992 23:47:00 GMT
- Lines: 41
-
- In article <1e4a23INNkjr@fido.asd.sgi.com> thk@sgi.com (Tom Kong) writes:
- >In article <1992Nov14.213324.1738@wuecl.wustl.edu> christos@wucs1.wustl.edu
- (Christos Papadopoulos) writes:
- >>In article <8c65TB1w164w@cellar.org> blu@cellar.org (Dan Reed) writes:
- >>>
- >>> Project AutoHack #004, Keeping your watercooled VW cool!
- >>>
- >>> For VW Jetta][/Golf, can be modified to fit any other
- >>> late watercooled VW.
- >>>
- >>>The Problem - Watercooled VWs are cooled by an electric fan. This fan
- >>>
- >>>The Solution - Wire up a simple 12V 30Amp relay to the fan. Find a wire
- >>> that is "hot" when the car is on (turns fan on), then
- >>> "cold" when the car is off (turns fan off). One simple
- >>> "hot" wire I found was the ignition coil. The could
- >>> should have (+) and (-) shown on the "face" of it.
- >>>
- >>> This hack is totally 100% reversible. No stock parts are
- >>> damaged or modified in anyway.
- >>>
- >>[lots of stuff and schematics deleted]
- >>
- >
- >
- >There seems to be a common belief that it is better to run the engine at
- >cooler temperature, hence we see 160F thermostat on the market, and various
- >schemes such as the above to allow the engine to run cooler.
- >
- >Perhaps someone knowledgeable can explain why there is such a need. I would
- >assume that the factory knows what is best. My understanding is that running
- >the engine at higher temperature improves its efficiency, and by running
- >cooler than designed, piston ring to bore clearence may not be optimal.
-
- A more general question: why is there such a range of thermostat opening
- temperatures between different cars? Obviously, the designers of cars with low
- thermostat temperatures thought there was something more important than
- maximizing engine efficiency.
-
- Chris O'Neill
- Telecom Australia Research Labs
-