Atkinson Differential & Cycle Model Engines

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After building the Atkinson Differential, it only seemed logical to build the Atkinson Cycle model engine. Both engines were designed and patented by James Atkinson in the 1880s. While they each have their own configuration, they have very similar characteristics.

Both engines are four stroke and complete all four strokes in one revolution. No timing gears or separate cam shaft.

Both engines have a power stroke that is about twice as long as the compression stroke.

While the Cycle model is easier to build, both have rather complex linkages that require patience to get it just right. A wood mockup of the Differential model linkage is very helpful.

Recommended books by Vince Gingery:
Building the Atkinson Differential Engine and Building the Atkinson Cycle Engine. Detailed, informative and fun reading.

The engines are machined out of bar stock, no castings except the flywheels, they are machined out of 10 pound gym weights. O-rings on the pistons and running on propane. They are a delight to build and display.

Cheers
Glenn Pfortmiller

Category:

Autos & Vehicles

Tags:

• unusual
• atkinson
• differential
• cycle
• model engine
• machined
• 4 stroke
• Glenn Pfortmiller
• homemade
• variable stroke
• Vince Gingery

[goodvolts]

I am not aware of any kits or castings for these engines. The books by Dave Ginery are very detailed and even show how to pour your own castings if you have the equipment. They are fun books to have even if you nevery build one.

[impavitus]

Very nice engines! So how is that Atkinson engine book? Did you get it from the Lindsay catalog?

[jasongiddensviper478]

Neat.

[Roobert33]

5*****

[rustygun001]

can a person buy these as "build it yourself" engine model kits? if so, who makes them? thanks much Riles

[chuckkottke]

I'm amazed at these engines, for their unique designs, and efficiency! Imagine if we had gone to such efficient engine designs from the get-go for automobiles - the savings would have been tremendous. Beautiful work - runs like a clock!