[Healeys] Running Temps--Was: Re: Aluminum Radiator

Derek Job derek.c.job at gmail.com
Wed Oct 15 02:23:35 MDT 2014


An aluminium radiator is actually less efficient than a normal one of a
similar design with similar cores. That's just physics.  Weight saving is
its biggest advantage.

Derek

On Tue, Oct 14, 2014 at 8:27 PM, Michael Salter <michaelsalter at gmail.com>
wrote:

> One factor which I have found makes a surprisingly large difference is the
> correct installation of the radiator baffles. I have resolved persistent
> overheating problems in 6 cylinder cars by just ensuring that the hot air
> from the engine compartment cannot make its way around to the front of the
> radiator..
> It's worth a try and a lot less expensive than an aluminium radiator.
>
> Michael S
> BN1 #174
>
> On Tue, Oct 14, 2014 at 12:47 PM, Bob Spidell <bspidell at comcast.net>
> wrote:
>
> > Agreed. I am using a (modern) sleeved-type thermostat, have a calibrated
> > gauge and have tried several thermostats (I tested a couple on the stove
> > and they functioned as expected). Still, my BJ8 engine will run below the
> > thermostat set point on a cool day with light load--I would expect the
> > coolant temp even under those conditions to rise to nominal, but it
> > doesn't. Our BN2 behaves the same way.
> >
> > The only comparison I can think of is air-cooled aircraft engines, which
> > usually have an oil cooler. There is a valve called a
> > Vernatherm--essentially a bi-metal strip--that closes off oil flow to the
> > oil cooler radiator to allow the engine to warm to operating temperature
> > before the cooler is brought 'online.' But, an air-cooled engine can
> > dissipate a lot more heat than an Austin lump.
> >
> > Is it possible the huge chunk of iron in front could be 'self-cooling' to
> > a point then, beyond that point, even with wide-open thermostat, cannot
> > maintain a set temperature? My guess is that at speed there is sufficient
> > airflow to cool the engine--even below the thermostat set point--but once
> > stuck in traffic or with a load there isn't enough excess airflow and the
> > cooling system's capability is exceeded (as Kees mentioned).
> >
> > Bob
> >
> >
> > ----- Original Message -----
> >
> >
> >
> > In general the temperature should be more or less constant under any
> > condition, just slightly above the opening temperature of the
> > thermostat. If the temperature shows to be lower than the thermostat
> > opening temperature the thermostat is at fault or is the wrong type (it
> > should be of the sleeved type), assuming the heater is turned off. If
> > very cold, with the heater plus heater fan on maximum, the temperature
> > could drop below the opening temperature of the thermostat.
> > If the temperature increases significantly the cooling capacity is
> > insufficient because of blockages/dirt, faulty water pump or the wrong
> > radiator capacity.
> > Older cars can have insufficient cooling capacity at low speeds/engine
> > revs, hence the advise to fit a thermostatically controlled electric fan
> > when the car is used in modern traffic.
> > Kees Oudesluijs
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