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High-Flow Engine Oil Cooler Thermostat

[Part # FSM-185/215]

$169.00 Free Shipping Details
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Improved Racing's Flow Series Motor Sport (FSM) oil thermostat is a universal solution that can be used with any oil cooler on any vehicle or industrial application flowing up to 20 GPM (75.71 LPM).

The device's unique, patented internal design (US patent 9,772,632) ensures a low pressure drop by placing the bypass valve mechanism completely out of the primary oil flow. This arrangement also allows for a compact design.

High performance vehicles require large oil coolers to ensure that the oil does not overheat during strenuous use. These coolers also introduce the danger of over-cooling the oil and delaying engine warm-up, resulting in horsepower loss, excessive engine wear and reduced gas mileage. Oil thermostats perform the critical function of bypassing the oil cooler until the oil has reached its minimum operating temperature.

The thermostat features female -10AN O-ring boss threads and is available with optional fittings in 3/8" or 1/2'' hose barb or AN fittings in -06AN, -08AN, -10AN, or -12AN. The included brackets allow for multiple mounting options.

Supersedes part numbers ENV-100 and EUN-1000.

Operation



Features and Benefits
  • Reduces excessive engine wear and horsepower losses while improving gas mileage by preventing oil temperatures from dropping below optimal levels
  • Maintains a minimum fluid temperature according to the typical stabilization temp in the table below, +/- 2°F (+/- 1°C)
  • Patented, high flow, low pressure drop design locates the valve assembly completely out of the primary fluid flow
  • Allows a small percentage (less than 10%) of fluid to continually circulate through the cooler to eliminate air pockets and prevent cold fluid trapped in the cooler from shocking the system
  • Rebuildable
  • 6061-T6 billet aluminum construction with black MIL-A-8625 Type II anodized finish
  • Lightweight at just 12.7 ounces (360g) without brackets or fittings

Temperature Rating Specifications

Part NumberTyp. Stabilization TempActivation TempFull Flow Temp
FSM-145145ºF (63ºC)140ºF (60ºC)163ºF (73ºC)
FSM-165165ºF (74ºC)160ºF (71ºC)181ºF (83ºC)
FSM-185185ºF (85ºC)180ºF (82ºC)203ºF (95ºC)
FSM-215215ºF (102ºC)212ºF (100ºC)233ºF (112ºC)



Unrestricted oil flow through thermostat
Valve assembly is completely housed between the two ports.
No valves, springs, or thermal motor interrupting the primary oil flow!


Compact dimensions
Compact dimensions (shown in inches)

Multiple mounting options
Brackets allow for multiple mounting configurations

Available in -06AN, -08AN, -10AN, -12AN and 3/8 hose barb
Available with 3/8" or 1/2'' hose barb fittings or AN fittings in -06AN, -08AN, -10AN, or -12AN


Applications
  • Engine, transmission, differential, and industrial fluid cooling applications flowing up to 20 GPM (75.71 LPM)
  • Passenger car automotive, marine, and experimental aircraft engine oil cooling systems
  • Automotive and truck power steering fluid cooling systems
  • Diesel and gas truck transmission fluid cooling systems
  • Diesel and gas truck differential and transfer case fluid cooling systems
  • Not for use with corrosive fluids. If used with water, a distilled water solution with a lubricant such as ethylene glycol must be used.
Includes
  • 1x Remote thermostat block
  • 4x Black anodized 3/8" or 1/2'' hose barb or -06AN, -08AN, -10AN, or -12AN adapter fittings with Viton O-rings (OPTIONAL)
  • 2x Zinc-plated steel mounting brackets and screws

Do you own this product?

1-5 of 5 Reviews Sort By:
5.0
5.0


by Jason G.
12/06/2015
Have a supercharged 2013 Miata NC automatic with CSF radiator and Tru Cool transmission cooler. Transmission wouldn't heat up over 105 the other day when temps were in the low 40's. Added this unit inline and did a little testing. 166 in town and 169-184 or say on the highway no matter how hard it was pushed with temps in the low 40's. Temps were low 30's yesterday morning and temps were 140 and climbing after a 10 minute drive to work. Was 80 at a little higher temps before the thermostat. Works great so far, can't wait to see how it does in the summer.
5.0
5.0


by Christopher C.
08/12/2015
I purchased this for the aftermarket oil cooler kit on my 92 Corvette. These cars don't come stock with one and there is not much room to work with. Excellent craftsmanship made it easy to tuck. Haven't seen temps over 200 yet. Would definitely recommend and purchase again
5.0
5.0


by Christopher K.
07/28/2013
Bought this thermostat for a 600+hp 335i and it regulates temperature to a T. The car never had a oil cooler before and even now with 2x 20row coolers the car warms up just as quick. The straight through design is genius and hasn't let up once on track days or everyday on the street . Very happy with this product and have recommended it to anyone in the market for one.
5.0
5.0


by Adam G.
06/28/2013
The IR oil thermostat works as expected and definitely is an improvement over the Mocal unit I had. I finally have safe operational temps during street driving (174-180f) and stable track temps of 211F. Mocal unit - 154F street/243F track.
5.0
5.0


by david r.
06/24/2013
I installed this solid billet thermostat on a very high end $200,000 Factory Five Racing Cobra. This piece is bad ass. It does exactly what the guy who designed it said it would do. This may be a fairly small company, But do not let that fool you. They make an excellent product that blows the competition away. The shipping was very fast too. Highly recommended company.
1-5 of 5 Reviews
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