Engine Operation Temperature Test Program

GTAT hired John Satterfield of Duchess Automotive Machine, Inc. to design and construct a test to determine the effect of Viscon on engine operating temperature.

Test Protocol
Tests were run on an 8 HP 4-cycle single cylinder Briggs and Stratton engine. The engine was run at wide-open throttle. Thermocouples were installed 1" from the exhaust port, at the tailpipe, on the fins above the intake port and above the exhaust port.

Test data is set forth below.


1) The average temperature 1" from the exhaust valve dropped 92F when Viscon was used.

2) The average temperature at the tailpipe dropped 215F when Viscon was used.

3) The temperature of the medal above the intake valve dropped 9F when Viscon was used.

4) The temperature of the medal above the exhaust valve dropped 30F when Viscon was used.

5) The differential between the metal temperature above the intake port and the exhaust port was reduced by 21F when Viscon was used.


1) Untreated fuel burned last in the power stroke--possibly in the exhaust stroke causing hot exhaust gas and a significant temperature differential between the intake and exhaust ports.

2) When Viscon was added to the fuel completion of burn was earlier.

3) Although there were no direct measurements of unburned gas temperature in the cylinder, metal temperature above the intake port indicates that the gas temperature in the cylinder near the intake port is about 40F cooler with Viscon than with neat fuel.