The research objective was to determine the role of the foundation plate temperature on the tensile strength and the impact on HDPE sheet welding using hot gas welding. HGW is a welding process for plastic materials, but it is known that plastic materials have poor heat conductivity. In the industrial world, the joining of two or more plastic parts can be done with plastic welding technology, one of the methods of plastic welding is hot-gas welding (HGW). Plastic material failures such as fractures or cracks can be repaired by joining. When the throttle is wide open, but the intake valve's movement is fast, the incoming air becomes not optimal so that the air trapped in the intake manifold increases, and the pressure rises. It happens because of the faster engine speed in line with the rapid movement of the intake and exhaust valves. At 5000 rpm engine speed, the intake manifold pressure again increases to an average of 26.1 Kpa. At 4000 rpm rotation condition of intake pressure rises to an average of 25.5 Kpa, this is due to the condition of the engine that requires quite a lot of air, but the movement of the suction valve is faster so that the air entering the combustion chamber is blocked and causes an increase in the amount of air in intake chamber. Whereas at engine speed 2000 rpm and 300 rpm shows the intake manifold pressure is low, this is due to the higher engine vacuum, the more air demand so that intake pressure decreases. At 1000 rpm rotation, the average condition shows intake pressure at 24.3 Kpa. shows variations in engine speed affecting the intake manifold pressure conditions. The relationship between Engine Speed Against Intake Manifold Pressure Figure 6.
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