This engine bears a structural resemblance to model 1650 rpm ( • 3ª teste do motor Stir... ) without cooling system, where the displacement piston stroke is 20 mm and the working piston stroke 14 mm. In this project, I achieved peak speeds of 1600 rpm, and at the time of video recording, this was not possible due to the need to fine tune the balloon, which had shrunk with heat, producing a great strain on the crankshaft. This engine has the same stroke measurements as the 1800 rpm model ( • Motor Stirling simples... ), but did not exceed 1600 rpm. One of the possible reasons for the lower performance is related to the reduction in engine length, which in turn the connecting rods are 20% smaller than the 1800 rpm model, causing a greater inclination of the connecting rods, producing greater friction of the displacement piston rod in the printhead. Another reason is also the lack of a cooling system that quickly reaches very high temperatures.
But one thing that made me happy was the good torque that can be seen in the video itself.
In this engine, I made two visible structural changes to the 1650 rpm model, increasing the crankshaft distance with the head by 10 mm, thus preventing the connecting rods from being 30% smaller than the 1800 rpm model.
This was the first engine that I used a 25mm PVC knee, as it is a design with several changes, it was really not possible to verify its real effectiveness. But I can say that it was very difficult to build, since it is a PVC knee is larger, the hole where the knee is attached to the hot cylinder, is very close to the hot chamber of the hot cylinder.
Engine characteristics:
Displacement piston rod: 110 mm;
Power piston rod: 70 mm;
Displacement piston stroke: 20 mm;
Working piston stroke: 14 mm;
Length of hot cylinder: 80 mm;
Head length: 60 mm;
Crankshaft support can length: 123 mm;
Crankshaft shaft diameter: 2mm stainless steel bicycle radius;
Number of cd's used on the steering wheel: 4 cd's;
Steel wool piston length: 25 mm;
Outer diameter of cold cylinder: 56 mm;
Height of cold cylinder: 25 mm;
Inner cover diameter of working piston: 30 mm;
Outer cover diameter of work piston: 40 mm;
Duct connecting the two cylinders: 25 mm PVC knee;
Peak engine rotation: 1600 rpm, not shown in the video;
Engine Constant speed: 1450 rpm, not shown in the video;
Heat source used: alcohol combustion 92.8 INPM;
Next Tuesday, December 10, at 8:00 am Brazil time, I will publish the new video tutorial of the homemade Stirling 1800 rpm engine, thank you all for the support of the release of this video.
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Thank you all for the attention.
Leandro Wagner.