Re: [AMC-list] AND ANOTHER THING 195.6

[Ken Ames <ameskg@xxxxxxxxx>]

Many thermostats have a bleed hole already drilled in. I drill one in to those I
get that don't.

Ken


Quoting tom jennings <tomj@xxxxxxx>:

> On Sat, Feb 6, 2010 at 06:25, Bruce Griffis <bruce.griffis@xxxxxxxxx> wrote:
> 
> > I was wondering about the drilling the thermostat thing. If the t-stat
> > button causes it to open to let coolant circulate, isn't drilling a
> > hole in it kind of like leaving it always open? Or is the hole small
> > enough so that there is only a small amount always circulating, then
> > when it opens it gets enough flow to keep it cool?
> >
> 
> On the 195.6 OHV head, the thermostat is in a cast housing waaay up in front
> of the cylinders.  It's clear in the photo below, the little 'pod' that the
> thermostat lives in. It's a design mistake for sure.
> 
>
http://wps.com/AMC/1963-Rambler-American/Nash-195.6OHV-engine/small/cleanheads2.JPG
> 
> The water pump wants to suck water from the bottom of the radiator, push it
> up the block, and into the head; the head is filled with many passageways
> around all the combustion chambers and exits out the thermostat, into the
> top of the radiator.
> 
> If the thermo is closed, water doesn't flow to the radiator, and the
> cylinder head heats up fast(er).  The cylinder head is long and thin.
> Remember, no water is flowing to the thermostat, so the water there remains
> cold until it gets how by conduction!
> 
> You can verify this youself. Engine cold, start and idle. Put your hand on
> the head (distributor side, or the intake trough cover). YOu can feel it get
> warm. At some point it's too hot to touch. Feel the bottom of the thermostat
> pod... COLD! At some point, the head water is HOT HOT, and the thermostat
> is... slightly warmer... it eventually opens and water flows and it
> temperature-regulates.
> 
> ONCE ITS OPEN it works right, because head water becomes thermostat water.
> 
> Drilling a tiny hole in the thermostat is common, it lets air bleed up to
> the radiator tank. A "big" hole (1/4"?) will let a decent amount of water
> flow. I intend to have that water flow past the actuator button on the
> bottom of the thermostat. Therefore, as the head warms up, head water will
> flow over the thermostat, "telling" the thermostat how hot the head is.
> Water circulating will mean like Mark says, even temperature distribution.
> 
> The downside is it will take longer to warm up and if the hole is too large,
> the head could run below rated thermostat temperature.  But it's just a
> thermostat, easy to experiment with.
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