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- Path: sparky!uunet!ogicse!uwm.edu!linac!att!cbnewse!cbnewsd!krc
- From: krc@cbnewsd.cb.att.com (kenton.cabiness)
- Newsgroups: rec.autos.tech
- Subject: Re: what is carburetor 'hot soak'
- Message-ID: <1992Jul23.151412.28601@cbnewsd.cb.att.com>
- Date: 23 Jul 92 15:14:12 GMT
- Article-I.D.: cbnewsd.1992Jul23.151412.28601
- References: <1992Jul13.012031.10501@cactus.org> <1992Jul13.124619.1008@dartvax.dartmouth.edu> <1992Jul15.054127.7388@fivegl.co.nz>
- Distribution: usa
- Organization: AT&T
- Lines: 34
-
- In article <1992Jul15.054127.7388@fivegl.co.nz> derek@fivegl.co.nz (Derek Tearne) writes:
- >>In some cars, hot soak was enough to actually boil gas in the
- >>carburator and is the reason some cars run the radiator fan after the
- >>engine is shut off.
- >
- >I have always wondered how this can cool the engine succesfully? The engine
- >is off so there is no water pump to move the coolant around the system and
- >the pump may act as a barrier to convection within the engine. I can
- >see that it would cool the water in the radiator (most of the coolant) and
- >stop the cap blowing, but not how it would cool the engine.
- >
-
- I can attest to this cooling the engine down (or at least it seemed
- like it to me). In the early stages of the re-build of my '74 'vette,
- I did not have a mechanical fan (the previous owner threw it away along
- with many other "essential" parts, but that's another story), so I installed
- the biggest, baddest electric fan I could find (the "Black Max" I believe it
- was). It was thermostatically controlled by a thermostat that was in
- contact with the radiator core. I connected it to a supply that was not
- switched. Upon shut down, even if it was not running at the time, it would
- run for some period of time, shut off, come back on, etc. Each cycle, the
- amount of time on became less and the amount off more, until it remained off.
- I account this to the cooling of the block by the convection of the water
- in the system. I agree that it could have just been cooling the radiator,
- but it seemed to run more than would be required to cool it IMHO. This
- worked fine at idle, but with the design of the body, the fan could not
- handle the cooling demands at crusing speeds. This must be about the only
- car that does not seem to get a natural cooling effect from the car moving.
- I replaced the electric with a HD flex fan, now it never gets warmer than
- the themostat rating (Anyone need a very good condition electric fan?)
-
- Kenton Cabiness
- AT&T Bell Labs
- krc@ihlpe.att.com
-