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High-Flow Transmission Fluid Thermostat, 165F

[Part # FSM-165]

$169.00 Free Shipping Details
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Improved Racing's Flow Series Motorsport (FSM) oil thermostat is a universal solution that can be used with any oil cooler on any vehicle or industrial application.

The device's unique patent-pending internal design 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.

This thermostat is designed for use with transmission and differential coolers and maintains a minimum temperature of 165°F (74°C) +/- 2°F exiting the transmission or differential in most conditions. It 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 number ENV-101.

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 of 165°F (74°C) +/- 2°F in most conditions
  • Patent-pending, 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
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
  • The FSM series thermostat is designed for universal oil temperature control in engines, transmissions, differentials, and industrial cooling applications.
Includes
  • 1x 165°F 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?

1-2 of 2 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 Eddie E.
07/09/2014
I own a Russian YAK55 single seat competition aerobatic aircraft and operate it in Australia where the usual operating temperature is somewhat higher than freezing Russia !
Needless to say I have struggled keeping the oil temperature in the "green" here. I also made the standard original Russian oil cooler work even harder when we retro fitted a more powerful version of the Venyendev MP14-PF engine. This engine is a 9 cylinder supercharged air cooled radial engine which develops 400+ HP at 3000 maximum rpm. It burns 150 litres - or over 40 Gals of Avgas per hour at full power and will hover like a helicopter in the vertical.

I finally got around to designing and having a new custom built oil cooler made that has around 70% better cooling ability.
The new oil cooler works a treat and in fact was now too good at keeping the oil cool. So I now had another problem of an oil temp that was too cold. After trying fixes like blocking off some of the intake area with race tape Etc. and getting results that I was still not happy with I started looking for a better solution... This brought me to the "Improved Racing" high flow oil thermostat product. This product looked like it was the best in the business so we ordered one to try out.
To my excitement this has completely solved my oil temp control problems - at last !!

It is working fantastic – holding the oil temp steady under quite difficult circumstances as the big radial engine does heat up and cool down fast as we go from full power settings on vertical up lines where there is little cooling air flow - to idle speed in down-lines where there is too much cooling for low power settings. The Improved Racing thermostat handles this with ease as for the first time in history I have a fantastic constant oil temperature which will improve engine performance and reliability as well as faster warm up times. The YAK has 12 Litres ( 3.3 Gals ) of oil to heat up before takeoff.

I will also use one of these thermostats on the motorcycle engine powered race car I am building which will provide the correct oil temp during different power settings and ambient temperatures, again improving performance and reliability.
The build quality of these products is second to none and I highly recommend their products to anyone who cares for their equipment.
Cheers
Eddie Edwards
1-2 of 2 Reviews
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