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- From: dick@hpscit.sc.hp.com (Dick Lucas)
- Date: Tue, 26 Jan 1993 18:13:16 GMT
- Subject: Re: Oil Coolant Engines?
- Message-ID: <51330062@hpscit.sc.hp.com>
- Organization: Hewlett-Packard, Santa Clara, CA
- Path: sparky!uunet!munnari.oz.au!sgiblab!sdd.hp.com!hpscit.sc.hp.com!hplextra!hpcc05!hpscit!dick
- Newsgroups: rec.autos.tech
- References: <1993Jan25.165652.4119@nntp.nta.no>
- Lines: 38
-
- In rec.autos.tech, BARANSKI@veamf1.nusc.navy.mil (Jim Baranski) writes:
-
- > Is the VW engine more accurately called an *AIR* cooled engine, or a *OIL*
- > cooled engine?
-
- > I don't know whether more BTUs are cooled by air normally, or by the oil, but
- > based on the oil cooler in more VW engines, I'd hazard a guess that they are
- > actually *OIL* cooled.
-
- > With a big enough cooler/radiator and collant flow, couldn't you use anything
- > (including standard oil) for the coolant? I assume that the coolant flow
- > through the engine would have to be at least halfway intelligent so that it
- > cooled all of the hot spots...
-
- > Jim Baranski
- ***************************
- In the final analysis, all cars are AIR cooled. Even water pumpers have
- radiators which cool the water-antifreeze mix.
-
- The distinction is usually made by where the majority of the heat is
- dissipated. VWs have an oil cooler which is in the cooling fan shroud, to be
- sure, but the cylinders are cooled by direct transfer to the air being blown
- over them. Since the majority of the heat is generated in the combustion
- area of the engine (cylinders and heads) and they are cooled by air flow,
- I think it's safe to call the air-cooled VWs (horizontally opposed 4 cyl)
- AIR-COOLED.
-
- As far as using oil for both cooling and lubrication, I suppose it could be
- done. Water has some unique advantages. It's cheap, readily available, & has
- low viscosity (pumps easily and allows better heat transfer because the flow
- can be turbulent.) Water also has high heat capacity, and if the engine
- really overheats, you can dissipate tremendous amounts of heat by boiling.
- Oil, on the other hand is expensive, viscous, and not that
- available (try topping off your oil from the stream by the side of the road)
-
- Dick Lucas
-
-
-