Re: [AMC-list] AND ANOTHER THING 195.6

[mask1966@xxxxxxx]

The thermostat I got for my 302 Ford had a hole in it stock. I always drill an 1/8 - 3/16 inch hole in every new one. I helps when filling the radiator for the first time too. Keep filling slowly and all the air will escape through the hole and fill the entire system.

Mike K






-----Original Message-----
From: Ken Ames <ameskg@xxxxxxxxx>
To: AMC, Rambler, Nash, Jeep and family <amc-list@xxxxxxxxxxxx>
Sent: Sat, Feb 6, 2010 3:24 pm
Subject: Re: [AMC-list] AND ANOTHER THING 195.6


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

uoting 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.
 

ttp://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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