High Tech, Fail Safe thermostat for all years Jensen Healey and all Lotus 907
engines. Probably the best advancement in thermostats in 80 years. When
and if this unit ever fails, it fails in the OPEN position ensuring that your
valuable Lotus engine can be spared from extreme overheating situations.
It has long been recognized in the automotive industry that a significant
cause of engine failure is overheating. One cause of engine overheating is
the failure of the thermostat to open to permit coolant fluid to flow to the
radiator. This failure of the thermostat to open is most often caused by
the loss of the expansive material in the power element or thermally
responsive actuator, which can occur for any number of reasons. When the
actuator fails, the movable valve member is not moved away from the
valve seat when the engine coolant temperature rises above the
predetermined temperature. It is understood, however, that the thermostat
may fail for other reasons. When the thermostat does not actuate, the
pressure of the coolant fluid and the force of the thermostat operating
spring cause the valve to remain in a closed position. A typical thermostat
therefore fails in a closed valve or engine overheat mode. The patented
Fail-Safe thermostat fails in the open position and can avoid catastrophic
Fail-SafeŽ thermostats offer OEM specification and design
replacements, stainless steel construction and are 100% calibrated to
guarantee performance and quality.
Choose 160 or 180 degree thermostat.
The stock engine came with a 180 F (82 C) degree, but we recommend a
160 F (72 C) degree thermostat in the 907 for warmer, desert areas or
engines with higher mileage.
PLEASE- never run your Jensen Healey or Lotus without a thermostat.
It does not make the engine run cooler and it can actually damage it.