If you are looking for Stirligkit Engine Model & accessories for a science project, goto stirlingkit and explore the products according to your requirement.
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https://www.stirlingkit.com/products/water-cooled-four-stroke-gasoline-model-engine-kit-fs-s100gw

four-stroke cycle engine is an internal combustion engine that utilizes four distinct piston strokes (intake, compression, power, and exhaust) to complete one operating cycle. The piston make two complete passes in the cylinder to complete one operating cycle.

Read our latest blogs here about Stirling Engines and Stirlingkit. https://stirlingkit.blogspot.com/2019/08/stirling-engines-different-models.html

Here you will get the information related to 16 Cylinder Stirling Engine and its working.

https://stirlingkit.blogspot.com/2019/09/some-interesting-facts-you-should-know.html