Wanna see a home-drilled stat? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 10-02-2003, 02:51 AM   #1
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Default Wanna see a home-drilled stat?

Here'* an old pic I forgot I uploaded:



I believe this was the first one I did. These holes are too big. The current stat either has 4 smaller holes or only 2 this size. Can't remember

The black round thingy is the rubber flange seal. You also need a fiber gasket for the housing. Make sure you de-burr the holes, and rinse thoroghly after drilling.
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Old 10-02-2003, 03:22 AM   #2
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what if i didnt wnat to see that?...lol...just playin...no doesnt that gasket just cover the holes or not?
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Old 10-02-2003, 03:26 AM   #3
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Nope. It doesn't cover that much of the stat flange. Put the gasket on the stat first, then mark where you want the holes
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Old 10-02-2003, 03:28 AM   #4
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ah...will do boss!
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Old 10-02-2003, 03:44 AM   #5
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How big are those holes then? I'm thinking on drilling two 1/18 inch holes in mine come spring. That should work, right? Or wait...shoudl I do 1/16?
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Old 10-02-2003, 09:21 AM   #6
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I just dropped a 180 stat in my bonnie and my MPG just went to ****, is that normal?
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Old 10-02-2003, 10:58 AM   #7
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Quote:
Originally Posted by bonnie94sse
How big are those holes then? I'm thinking on drilling two 1/18 inch holes in mine come spring. That should work, right? Or wait...shoudl I do 1/16?
1/18?!? Is that standard? 1/18 of what?? An inch?




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Old 10-02-2003, 11:25 AM   #8
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My recommendation for drilling holes in a 180 stat is to drill 2 - 3/32" holes if you operate the vehicle for trips of 15 minute duration or more. 1 - 3/32" hole if you operate the vehicle for short trips of 10 minutes or less. 4 - 3/32" holes if you want a very long warm up cycle like for drag racing in warm weather.

1/16 of an inch is a little smaller and 1/8 of an inch is a little bigger of a hole. You could probably use any of these sizes and the difference will be a small increase or decrease in warm up time.
The operating temperature will drop a few degrees with the larger hole(*) opening but it will be very dependant on the ambient air temp conditions like summer to winter variations.

Your mileage will drop a little because you will be in warm up cycle longer.
As an example of hole size sensitivity, when I ran with 4 - 3/32" holes I would average 15 mpg in town driving. When I changed to 1 - 3/32" hole my mileage increased to 16 mpg, but more importantly, in cooler 40* F weather my engine will reach operating temperature within a preset duration and not set off the SES light.
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Old 10-02-2003, 01:08 PM   #9
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Quote:
Originally Posted by Buddha Jones
I just dropped a 180 stat in my bonnie and my MPG just went to ****, is that normal?
No, that'* not normal, and it'* not your thermostat, either. Put a 195 in, and I bet it will still be getting shitty mileage.
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Old 10-02-2003, 01:11 PM   #10
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Here'* the "stats" on my new 'stat' :

http://www.bonnevilleclub.com/forum/...ght=thermostat
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