[Healeys] thermostat discussion

[Oudesluys]

Steve,
The total flow of coolant is more or less the same at a given engine 
speed. At all times all the coolant is passed through the engine.When 
the engine is cold most coolant will be circulated through the by-pass 
and only a trickle through the radiator. At the opening temperature of 
the thermostat more coolant will start to flow through the radiator and 
less through the by-pass. When the coolant gets hotter the thermostat 
will open further allowing more coolant to flow through the radiator and 
even less through the bypass. However if all is in good nick the 
thermostat will never open fully except possibly when idling for a long 
period, when it is not unusual for the coolant temperature to rise above 
normal or even over boiling point. That is why ideally you should  fit a 
thermostaticly controlled electric fan to the radiator if you are 
traveling in modern traffic(jams).
Kees Oudesluijs
NL


BJ8 Healeys schreef:
> If the argument is that the water flows too fast through the radiator for
> the rad to cool it, then it should also be flowing too fast through the
> engine to pick up its normal load of heat, yes?  So the faster the coolant
> flows, the less it cools?  I think something is wrong with the
> thermodynamics here.
>
> Steve Byers
> HBJ8L/36666
> BJ8 Registry
> Havelock, NC  UsA
>
> -----Original Message-----
> From: healeys-bounces at autox.team.net [mailto:healeys-bounces at autox.team.net]
> On Behalf Of F Ronald Rader
> Sent: Wednesday, July 15, 2009 1:51 AM
> To: Healey List
> Subject: Re: [Healeys] thermostat discussion
>
> my apologies. i miss the first part of this thread.
> although my BJ8 runs at 165 on the hottest days in traffic with a 160
> degree thermostat my 1966 Mustang (with ALL new parts) runs between
> 180 and 200 because i have a 180 degree thermostat.
> the shop that works on it insists that i should not change to a 160
> thermostat because it wont make it run cooler because the water does
> not stay in the radiator long enough.
>
> i think they are wrong.
> ron rader
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