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Description
ENJOMOR Hot Air Alpha-Type Walking Beam Stirling EngineENJOMOR Hot Air Alpha Type Walking Beam Stirling Engine Features: . Advanced Type Configuration: Our Stirling engine features an advanced type dual cylinder dual piston design, ensuring outstanding heat transfer efficiency. With separate hot and cold cylinders and stainless steel insulation between them, it delivers optimal performance. . Dual Cylinder Dual Piston Design: With a vertical cylinder design, the engine benefits from enhanced overall heat
ENJOMOR Hot Air Alpha-Type Walking Beam Stirling EngineFeatures:
.Advanced α-Type Configuration: Our Stirling engine features an advanced α-type dual cylinder dual piston design, ensuring outstanding heat transfer efficiency. With separate hot and cold cylinders and stainless steel insulation between them, it delivers optimal performance.
.Dual Cylinder Dual Piston Design: With a vertical cylinder design, the engine benefits from enhanced overall heat absorption, as the cooling cylinder volume exceeds that of the heating cylinder. This promotes rapid air cooling at high temperatures, creating a greater temperature differential.
.Quiet and Smooth Operation: Enjoy the benefits of quiet and smooth operation. The dual piston system not only maximizes efficiency but also minimizes vibration, providing a serene and stable user experience.
.Durable Structure: Crafted from premium materials, our Stirling engine is engineered with precision and durability in mind. This ensures longevity and resilience, making it a reliable investment for those seeking long-lasting, efficient power solutions.
.Versatile Applications: From educational demonstrations to practical use, the α-type dual cylinder dual piston Stirling engine serves a wide range of purposes. It can be utilized as an excellent educational tool, captivating desktop ornament, or even a small-scale generator, catering to diverse interests and needs.
.Product Description: This is an α-type dual cylinder dual piston Stirling engine, without separate valve cylinders. Instead, a set of cylinders identical in structure to the cooling side cylinders participate in both heat exchange and work together. Due to the two sets of independent and identical cylinders, one side generates heat while the other side handles cooling, with both sets of cylinders generating power simultaneously.
Because of their complete independence, the two sets of cylinders exhibit a significant temperature difference. While the temperature on the heating side reaches up to 600 degrees Celsius, the temperature on the cooling side cylinders can maintain around 50 degrees Celsius after continuous operation for 20 minutes, resulting in a temperature difference of over 500 degrees Celsius, providing a sufficient and continuous power output source.
This engine utilizes 20mm power cylinders and 20mm stainless steel heating tubes on both sides. The heating tube on the heating side cylinder is notably longer than that on the cooling side, designed for optimizing compression ratio.
The connecting rods of the two sets of cylinders are not directly linked but connected via two sets of gear systems, with a gear ratio designed as 2:1. The crankshaft rotates at a speed of 1000r/min, while the 78mm diameter, 155g flywheel rotates at a speed of 2000r/min, contributing to the machine's stability through its powerful inertia.
To ensure smooth and quiet operation as much as possible, the entire engine employs 14 precision bearings.
In order to maximize the lifespan of the cylinders and pistons, GCR15 bearing steel is chosen as the raw material for cylinder liners and piston sleeves. After CNC lathe machining, they undergo quenching treatment to increase hardness to 58-62HRC, followed by grinding treatment with an accuracy of around ±0.005mm. The piston's reciprocating motion within the cylinder requires efficient sealing of the gas inside, which is a critical aspect reflecting the precision of the Stirling engine.
Featuring a large-sized flywheel, dual cylinder dual piston design, double gears, brass connecting rods, crankshaft, dual 10mm aluminum alloy brackets, and both sets of cylinders embedded with 2.5mm thick cylinder liners, the engine employs up to 30 bearings to ensure smooth and quiet operation.
Specification:
.Brand: ENJOMOR
.Name: Alpha-Type Dual Cylinder Dual Piston Stirling Engine Model
.Item: M20-T
.Material: Stainless Steel + Brass + Aluminium Alloy + Bamboo
.Form: Finished Version
.Inner Diameter of Heating Tube: 20mm
.Diameter of Piston: 20mm
.Piston Stroke: 20mm
.Flywheel Diameter: 78mm
.Pulley Diameter: 20mm
.Total Number of Bearings: 30
.Strat Mode: Manual Start
.Product Weight: 2.2kg
.Package Weight: 2.5kg
.Product Dimensions: 190 x 138 x 200mm
.Package Dimensions: 230 x 130 x 160mm
.Packing: Box
.Ages: 16+
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Exchange/Return Notes
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4.5 ★★★★★
Based on 15 reviews
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Product Reviews
★★★★★ 5
Excellent dog balls — safe design and very durable
Style: Fetch Balls (Pack of 3), Size: 2.5 inch
These fetch balls from Amazon Basics are fantastic, and my dog absolutely loves them. One of the biggest reasons I prefer these over other brands is the hole that runs through the center of the ball. This is a very important safety feature: if a dog were to accidentally get the ball stuck in the back of the throat, the hole allows air to pass through. That small detail could literally make a life-saving difference.
Aside from the safety benefit, they bounce well, are easy to clean, and hold up to a lot of playtime. They’re firm but not rock-hard, and my dog goes crazy for them. Great value, great quality, and a thoughtful design.
Highly recommended for dog owners who want a safer alternative to standard solid rubber balls.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 1, 2025
★★★★★ 5
Great ball for heavy chewers
Style: Assorted Balls (Pack of 3), Size: 2.5 inch
Great toy for my Doberman. She chews through tennis balls in about 15 minutes but these are very durable. She likes to chase them but also just chew on them.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 26, 2026
★★★★★ 5
Durable
Style: Fetch Balls (Pack of 2), Size: 3 inch
Very bouncy. I like the noise it makes when you throw it. Pretty durable. Good size. Dog loves to play with them. Good material. Easy to use.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 5, 2026
★★★★★ 4
My dog loves glowing fetch at night!
Style: Glow Balls (Pack of 3), Size: 2.5 inch
Fantastic. Sturdy. My dog loves them
Glow in the dark is great for fetch at night. I keep a flashlight with me because the glow doesn't last really long. But they charge very quickly and are really bright.
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Reviewed in the United States on February 22, 2026
★★★★★ 5
Indestructible
Style: Fetch Balls (Pack of 2), Size: 3 inch
These balls are indestructible! We have a lab and a lab mix and they CANNOT damage these balls. They love them for fetch and to just chew on them (slightly squishy, but NO damage). Best toys we have bought for them.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 19, 2026
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