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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+
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
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4.6 ★★★★★
Based on 7 reviews
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Product Reviews
★★★★★ 5
First ball was great!
Color: Black Green, Size: 8 Inch
This ball was great! My dog loves it. I ordered another smaller one. It had no pump and the inside was separated from the outside piece so it couldn’t be pumped up.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 18, 2026
★★★★★ 5
Fun and durable
Color: Flag, Size: 6 Inch, Color: Flag, Size: 6 Inch
I have a 5 month old teething Whippet puppy and this toy is a favorite. She loves carrying it around by the straps, playing tug, and trying to chew it. I think it’s pretty tough and durable for someone her size. I could see how a shepherd might destroy it quickly, though.
I was surprised to find you have to inflate it, but the pump and needles are included and it hasn’t lost any air over several days of rough play. (I kick it and toss it to her. We tug with the straps. She carries it everywhere.) The material feels like a heavy duty soccer ball, just smaller. It’s the perfect size for her.
I’d definitely buy it again.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 1, 2026
★★★★★ 4
It's a (smaller) soccer ball with nylon straps. Will no last long for aggressive chewers.
Color: Black Green, Size: 8 Inch
As the item title states, it's a soccer ball with straps. It feels like a soccer ball, but smaller and doesn't make any noises. The 8 inch size just right for my 50 lb dog. He can't get his mouth around the ball, but can bite down on the straps as we kick it around. He also plays and tosses it around by himself. It's also easy to clean.
It's a good item, but suffers from two issues.
01) The nylon straps are tough, but not as durable as I though. My dog is aggressive chewer and has managed to chew them up a bit.
02) There is a nylon strap that is longer than all the others, so he tends to focus on that one. After about 15 days of playing with hit, he's managed to chew that strap up to the point that it's almost falling off. It would be nice if all the straps were the same, larger, size.
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Reviewed in the United States on October 27, 2025
★★★★★ 5
Highly recommend
Color: Black Green, Size: 8 Inch
I was skeptical that it would hold up to our aggressive chewer puppy (staffyX) - especially during teething. But it has survived past teething into adult chompers and is still fantastic! Its his favorite outside toy, especially the tags make it fun (and those have been holding up well too). If/when it fails, I'll buy another one.
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Reviewed in the United States on May 2, 2026
★★★★★ 3
great design, poor overall quality
Color: Black Green, Size: 8 Inch
My dog loves these balls. The "tags" are a great design. The problem I have is the quality as they aren't tough enough. He goes through them pretty quickly tearing off the tags and puncturing the ball. He doesn't get that these actually cost money!
Each one also comes with a small pump, which I guess is great for a one time buy?, but man, if you don't own a pump just buy one and keep one. I have no use for several of these cheap pumps. How about offering the pump as an add-on for a dollar or two?
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 13, 2026
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