1/8 'stat Hole(Jerry H) was: Cooling System. A "Cool" Example. Otis Davis

["Otis Davidson" <otisdavidson@xxxxxxxxxxx>]

Hello Jerry,(and List),

The reasoning I have behind drilling a small hole in the 'stat is to lessen 
the Thermal shock that happens when the thermostat first opens letting cold 
coolant into the engine by letting a very small amount constantly through.

The small hole also allows air to escape from the system easier when 
replacing a hose,refilling the system,etc. It prevents the formation of an 
air pocket at the thermostat which would prolong it's opening.

Just make sure that the hole is small so that warm-up time is not 
excessively prolonged. I find that an 1/8 hole,drilled about 3/8 in from the 
outer edge,works just fine. Don't drill the hole in the moveable part of the 
'stat.

I have used this technique in all of my MoPars,daily-drivers,the RV,etc for 
years. I can't remember who first mentioned it to me. It was a long time 
ago.

Steve from Albany,N.Y.
'75 Imp 4dr
'70 440 powered 35 ft RV
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----Original Message Follows----
From: "Jerry Hesch" <jerry@xxxxxxxx>

Why the hole drilled? please explain
jerry 53
__________________________________________________________
----- Original Message -----
From: Otis Davidson <otisdavidson@xxxxxxxxxxx>
To: <mailing-list@xxxxxxxxxxxxxxxx>
Sent: Sunday, April 21, 2002 10:36 PM
Subject: IML: Cooling System. A "Cool" Example.


 >
 >   Hey Gang,
 >
 >   I have noticed alot of Cooling System advice lately.
 >
 >   This is the approach that I have used with much luck:
 >
 >   1) A 160'F 'stat with a 1/8 hole that I drilled in it.
 >   2) A 50/50 mix of Prestone and H20
 >   3) An aux transmission cooler so that scorching-hot tranny fluid is not
 > running thru my lower rad tank,adding more heat to the radiator.
 >   4) A "hosing-out" of my radiator fins now and then with a car wash 
power
 > sprayer to rid it of bugz,etc.
 >
 >   An aftermarket Water Temp gauge has been added by me so that I can
 > cross-check the temp with the factory gauge. I have never seen temps go
 > passed 200-210,ever....even on 90'F+ days sitting in traffic. No,I don't
 > have the heavy-duty radiator.
 >
 >   It helps to have a properly working clutch-fan that will lock-up when
 > thingz get too hot. It also helps to have a clean cooling system to avoid
 > hot spots. If your temps are hot as per the sending unit in the front of
the
 > block by the 'stat housing,you could very well have localized hot spots 
in
 > the back of the block or heads hot enough to bake ceramics.
r

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