Re: IML: Thermostats

[sosmi@xxxxxxxxxxx]

Since the design thermostat was 180, with all engine parameters the same, it would be the most logical choice. The cars were tested under all operational conditions, and the cooling system must have been approved. If you have cooling system problems, there must be a short-coming some where. I don't suppose 30-40-50 years has an effect. Or does it? Dave

 

-------------- Original message --------------
From: "Klebert L. Hall" <crocuta@xxxxxxxxxxx>

> > Subject: Re: IML: thermostats
> > From: PAUL WENTINK
> >
> > I don't understand how the lower temperature thermostat is going to
> > cool down a hot engine. Once its hot, the only way to cool it down
> > is
> > to turn it off and wait. Sitting in traffic with it running will only
> > make it hotter since there is less air and water circulation under
> > stop
> > and go conditions.
>
> You're right, it doesn't help at all once the engine is hot.
>
> Here's the circumstance where I've found it helps:
>
> I'm driving along the highway at 70 or 80mph on a hot day, with the
> A/C on - the car is running in proper temp conditi on, so the coolant is
> around the thermostat temp, and the thermostat is opening and closing
> periodically.
>
> I then get off the highway (and probably turn off the A/C
> temporarily). I have to slow down, or enter stop-and-go traffic, so the
> engine temp starts to climb. It will eventually cool down, as the
> cooling system catches up with the big heat dump from the lower airflow
> (presuming it isn't overwhelmed and overheats), but right now it's
> climbing.
>
> If the thermostat is a 160, the temp starts climbing from the
> vicinity of 160 and has about 90 degrees until it gets to the boil-over
> imminent range around 250. If it's a 180, it starts around 180, and only
> has 70 degrees to go.
>
> Thus, the lower temp thermostat gives a bigger time and temperature
> 'cushion', in which the cooling system has a chance to catch up.
>
> -Kle.
&g t; '69 Crown 4DHT (resting)
>
> ----------------- http://www.imperialclub.com -----------------
> This message was sent to you by the Imperial Mailing List. Please
> reply to mailing-list@xxxxxxxxxxxxxxxx and your response will be
> shared with everyone. Private messages (and attachments) for the
> Administrators should be sent to iml.webmonster@xxxxxxxxx
> To UN-SUBSCRIBE, go to http://imperialclub.com/unsubscribe.htm
>