[Healeys] Thermostats

[Elton Schulz]

Steve,
You are absolutely correct! The rate of heat transfer is determined by the 
resistance of the boundary layers of the coolant and the air. The greater 
the velocity of coolant through the radiator and the velocity of air, the 
thinner the boundary layer and therefore the less resistance to heat 
transfer.
Elton
----- Original Message ----- 
From: "BJ8 Healeys" <sbyers at ec.rr.com>
To: <healeys at autox.team.net>
Sent: Wednesday, August 25, 2010 10:23 PM
Subject: Re: [Healeys] Thermostats


> "If this controller restriction did not exist the coolant would flow
> rapidly to rad causing your car o over heat. the radiator requires time o
> cool
> your coolant."
>
> Marty, I think what you intended to say was if the thermostat was not 
> there
> then the coolant would flow too rapidly through the radiator to be cooled
> and the car would overheat (correct me if I'm misinterpreting your
> statement).  Then why does the BMC parts manual for the BJ7 and BJ8 (page
> MA8) identify a blanking sleeve only in lieu of a thermostat as an option
> for cars going to extremely hot climates?
>
> I respectfully have to disagree with you.  It has been a long time since I
> took Thermodynamics 301 and 302 in college, but as I recall the cooling
> ability of a closed system depends on the coolant flow rate, the cooling 
> air
> flow rate, and the difference in temperature between the coolant and the
> ambient air.  The greater the flow rate of either coolant or air, the 
> higher
> the heat transfer rate and the better the cooling.
>
>
> 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 Martin Jansen
> Sent: Wednesday, August 25, 2010 8:35 PM
> To: healeys at autox.team.net
> Subject: Re: [Healeys] Thermostats
>
> A thermostat is to assist in warm up as well as to control coolant flow to
> the
> rad If this controller restriction did not exist the coolant would flow
> rapidly to rad causing your car o over heat. the radiator requires time o
> cool
> your coolant.
> the thermostat controls the coolant flow.
> If a car is overheating check the exhaust for any restrictions and check 
> the
> cam shaft if worn this can lead to overheating. Another area to check is 
> the
> pitch of the fan blade, this can cause overheating if too shallow not
> allowing
> enough volume of air to be pulled through the rad.
> Re stricter plates are used in race cars travelling at high speeds.
>
> Happy Healeying,   Marty  www.jule-enterprises.com
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