Nissan 370Z Forum - View Single Post - Mishimoto Thermostatic Sandwich Plate, Gold

Mishimoto · 05-06-2013, 09:46 AM

Hey Guys,

We happened to come across this thread and our engineering team provided some input that should help explain our sandwich plate.

Great discussion guys, and you both make valid points.

"The built-in thermostat prevents oil flow to the cooler until the engine oil reaches activating temperature".

Yes this is a general statement, and the actual number is closer to 90-95% is block, not 100% percent. This is because you do want some oil to pass through the system (wstar mentioned this) and get the really cold oil out of the lines and oil cooler. “other companies” actual allow up to about 40% (estimated) of the oil to flow through the oil cooler during the warm up stage. This means your car will take a lot longer to heat up the oil than with the Mishimoto sandwich plate.

“If this unit really operates as described, there could be a thermal shock if it suddenly sends 180F oil down to the cooler when the cooler's still dead cold.”

This will not happen because some oil (5-10%) will circulate during warm-up and the thermostat takes several seconds to open. It is not like a valve that quickly introduces a rush of cold oil to the engine. It works on the same principles as a radiator thermostat. The heated liquid melts the wax in the thermostat and a spring moves the valve. It takes the thermostat anywhere from 20-60 seconds to fully open up. At that rate your engine should have cycled its oil a few times.

We have tested this theory using CFD software as well as a test rig that shows the change in flow rates with added temperature to the oil. We are thinking about a way to video the test rig and share this exact topic with the public. I’m glad to see that people like flashgordon are able to understand the product and its advantages over other designs.

We would be happy to answer any further questions!

Thanks

05-06-2013, 09:46 AM	#6 (permalink)
Mishimoto Base Member Join Date: Jul 2011 Location: Wilmington, DE Posts: 80 Drives: 370Z Rep Power: 14	Hey Guys, We happened to come across this thread and our engineering team provided some input that should help explain our sandwich plate. Great discussion guys, and you both make valid points. "The built-in thermostat prevents oil flow to the cooler until the engine oil reaches activating temperature". Yes this is a general statement, and the actual number is closer to 90-95% is block, not 100% percent. This is because you do want some oil to pass through the system (wstar mentioned this) and get the really cold oil out of the lines and oil cooler. “other companies” actual allow up to about 40% (estimated) of the oil to flow through the oil cooler during the warm up stage. This means your car will take a lot longer to heat up the oil than with the Mishimoto sandwich plate. “If this unit really operates as described, there could be a thermal shock if it suddenly sends 180F oil down to the cooler when the cooler's still dead cold.” This will not happen because some oil (5-10%) will circulate during warm-up and the thermostat takes several seconds to open. It is not like a valve that quickly introduces a rush of cold oil to the engine. It works on the same principles as a radiator thermostat. The heated liquid melts the wax in the thermostat and a spring moves the valve. It takes the thermostat anywhere from 20-60 seconds to fully open up. At that rate your engine should have cycled its oil a few times. We have tested this theory using CFD software as well as a test rig that shows the change in flow rates with added temperature to the oil. We are thinking about a way to video the test rig and share this exact topic with the public. I’m glad to see that people like flashgordon are able to understand the product and its advantages over other designs. We would be happy to answer any further questions! Thanks __________________ Mishimoto Automotive