Wanna see a home-drilled stat?
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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.
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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From: Salina, KS
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? :?
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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.
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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Originally Posted by Buddha Jones
I just dropped a 180 stat in my bonnie and my MPG just went to ****, is that normal?
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