High-Flow Engine & Transmission Oil Cooler Thermostat

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Part #
FSM Configurator
  • 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).
  • Accelerates fluid warmup time and maintains a minimum fluid temperature.
  • Patented high-flow design with no valves, springs, or other obstructions in the primary oil flow.
  • Features -10AN female O-ring boss ports. Optional adapter fittings available in various sizes.
  • Lifetime warranty. Made in the USA.

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Part # FSM Configurator
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High-Flow Engine & Transmission Oil Cooler Thermostat
High-Flow Engine & Transmission Oil Cooler Thermostat

In stock

$169.00

Summary

    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 -6AN, -8AN, -10AN, or -12AN. The included brackets allow for multiple mounting options.

    Supersedes part numbers ENV-100 and EUN-1000.


    Operation

    Improved Racing FSM Inline Thermostat Flow Diagram

    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 Number Typical Stabilization Temp Activation Temp Full Flow Temp Recommended Application
    FSM-145 145ºF (63ºC) 140ºF (60ºC) 163ºF (73ºC) Trans & Diff Fluid
    FSM-165 165ºF (74ºC) 160ºF (71ºC) 181ºF (83ºC) Trans & Diff Fluid
    FSM-185 185ºF (85ºC) 180ºF (82ºC) 203ºF (95ºC) Engine Oil (Street & Strip)
    FSM-205 205ºF (96ºC) 200ºF (93ºC) 221ºF (105ºC) Engine Oil (Street & Strip)
    FSM-215 215ºF (102ºC) 212ºF (100ºC) 233ºF (112ºC) Engine Oil (Road Racing)




    Unrestricted oil flow through Improved Racing high-flow in-line thermostat

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



    Improved Racing FSM Thermostat Dimensions
    Compact dimensions (shown in inches)



    Improved Racing FSM Thermostat mounting bracket configuration options
    Brackets allow for multiple mounting configurations



    Adapter fittings available for FSM thermostat
    Available with 3/8" or 1/2'' hose barb fittings or AN fittings in -6AN, -8AN, -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 -6AN, -8AN, -10AN, or -12AN adapter fittings with Viton O-rings (OPTIONAL)
    • 2x Zinc-plated steel mounting brackets and screws
    Specifications
    Drop Ship ItemNo
    Special Order ItemNo
    Primary Material6061-T6 aluminum
    FinishType II Anodized
    ColorBlack
    Inlet Port Size-10AN O-Ring Boss Female
    Outlet Port Size-10AN O-Ring Boss Female
    Minimum Temperature Rating-40°F (-40°C)
    Maximum Temperature Rating302°F (150°C)
    Maximum Operating Pressure300 psi (20.68 bar)
    Max Recommended Flow RateUp to 20 GPM (76 LPM)
    Fluid CompatibilityCoolants
    Engine oil
    Power Steering Fluid
    Transmission fluid
    Part Weight12.7 oz (360g)
    ManufacturerImproved Racing
    Instruction Manuals
    High Flow Remote Oil Thermostat 145°F
    High Flow Remote Oil Thermostat 165°F
    High Flow Remote Oil Thermostat 185°F
    High Flow Remote Oil Thermostat 205°F
    High Flow Remote Oil Thermostat 215°F
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