Stant's 180°F (82°C like OEM) Superstat # 45868 was fitted by removing just over 1/8" around its 2.050" flange to match original 1.750" diameter. Jiggler pin cut off, its bleeder hole of 3/32" (2.38125 mm) diameter compared to stock 3 mm is not on top when installed in its only possible position. I drilled a 1/16" hole on top, between the marked '5' and '2' as seen on photos. This gives me 9% less bypass hole surface area (6.4328 mm2 from original 7.0686 mm2). I also trimmed and bent the sides of the tabs a bit for a good fit... I also removed some paint overspray that was starting to peel from the edge in the thermostat housing.
"Unlike conventional thermostats that continually open and close to achieve the proper operating temperature and flood the engine with coolant, the Stant SuperStat®️ thermostat has a patented v-notch, non-linear design that reduces cycling by precisely metering the amount of coolant needed to maintain proper operating temperature.
The v-notch provides a small inital flow. As the engine heats up, the v-notch gradually opens wider, metering coolant into the system until the desired engine temperature is reached.
The benefits of proper engine temperature are efficient engine operation, prolonged engine life, reduced oil consumption, improved fuel economy and reduced emissions.
Stant's SuperStat®️ uses a high flow venturi for maximum cooling capacity during high temperature, high load operation and employs a patented Weir Valve®️ for precise flow metering during cold weather, light load operation to ensure stable temperature control under all conditions. The high strength stainless steel flange is burnished to a bright finish for additional stress relief and added corrosion resistance. The Stant SuperStat®️ thermostat flange thickness of 0.040" is 33% thicker than our standard reverse poppet thermostat and up to 43% thicker than competition for added strength and longer life.
The power element of SuperStat®️ is comparable to those used in heavy-duty trucks. Its actuator piston is 25% larger in diameter than our standard thermostat and 56% larger than competitive product. This larger piston delivers 1 1/2 times the power of our standard thermostat and almost 2 1/2 times as much power as the competition for enhanced durability and longer life. The opening spring of the Stant SuperStat®️ thermostat is designed with a load that is 50% stronger than our standard reverse poppet thermostat. This heavy-duty spring helps return the thermostat to the closed position and prevent cold running, even under the most adverse conditions."
Stock NTCL (Nippon Thermostat Co LTD) 82°C (179.6°F) thermostat is exactly as shown, but without the rubber seal on it.
"Opening valve diameter 26mm. Used for small cars." http://www.ntcl.co.jp/en/products/motor/#thermo02
Original NTCL / Stant Superstat #45868