In this engine, the working cycle is completed in two strokes of the piston or one revolution of the crank shaft. It will be easier to describe the cycle beginning at the point when the piston has reached to TDC completing the compression stroke, the spark is produced by spark plug as the piston reaches TDC but here a bulb is provided to show the spark timing.(the bulb will glow at the time of sparking) When the piston uncovers the exhaust port during the downward stroke, the burnt gasses leave the cylinder through the exhaust port. A little later, the piston uncovers (opens) the transfer port in this position, the crank-case is directly connected to the cylinder through port. During the downward stroke of the piston, the charge in the crankcase is compressed by the underside of the piston at this position; the compressed charge (fuel &air) is transferred through the transfer port to the upper part of the cylinder. The exhaust gases are swept out with the help of fresh charge.

The apparatus consists of main central heater and ring guard heater, sandwiched between the specimens. Cooling plates are provided on the either side clamped between heater and cooling plates. Ring guard heater ensured unidirectional heat from the flow through specimen.

In this engine, the working cycle is completed in two strokes of the piston or one revolution of the crank shaft. It will be easier to describe the cycle beginning at the point when the piston has reached to TDC completing the compression stroke, the spark is produced by spark plug as the piston reaches TDC but here a bulb is provided to show the spark timing.(the bulb will glow at the time of sparking) When the piston uncovers the exhaust port during the downward stroke, the burnt gasses leave the cylinder through the exhaust port. A little later, the piston uncovers (opens) the transfer port in this position, the crank-case is directly connected to the cylinder through port. During the downward stroke of the piston, the charge in the crankcase is compressed by the underside of the piston at this position; the compressed charge (fuel &air) is transferred through the transfer port to the upper part of the cylinder. The exhaust gases are swept out with the help of fresh charge.

The apparatus consists of main central heater and ring guard heater, sandwiched between the specimens. Cooling plates are provided on the either side clamped between heater and cooling plates. Ring guard heater ensured unidirectional heat from the flow through specimen.