TL;DR
Get garage and car supplies delivered free — and shop member deals
- Fast, free delivery on millions of items
- Access to Prime Big Deal Days deals on October 6–7
- Prime Video, Amazon Music and more included
YouTuber Delton Adams built a working Lego model based on an antique hit-and-miss engine. The replica uses vacuum power instead of combustion and includes features such as an inverted cam arrangement and a fly-ball governor. Adams says it produces 0.12 watts, or about 1.5 “studpower.”
YouTuber Delton Adams built a working Lego model of an antique hit-and-miss engine, adapting the early internal-combustion design to operate with vacuum power rather than combustion. The project recreates key mechanical features, including a fly-ball governor, while producing a reported 0.12 watts of power.
Adams’s model is based on a four-stroke hit-and-miss engine, a type once used mainly as a stationary power source. Rather than firing on every cycle, the original engines used a governor to regulate speed: at a set speed, the engine would get an ignition “hit”; when it ran faster, it would “miss” cycles. The design has not been in common use since the 1930s, according to The Drive’s report.
The Lego version does not burn fuel. It uses air that is pumped in and drawn out, creating a two-stroke operating cycle. Adams explains in his video that directly copying the real engine’s four-stroke operation would cause the piston to be pulled out of position under vacuum. To address that difference, he moves the camshaft out of the way during the relevant part of the cycle and uses an inverted cam and rocker, with a spring to operate the valve against the vacuum pressure.
The replica also includes a centrifugal fly-ball governor, a crankshaft with roller bearings, a piston and connecting rod joined by wrist pins, and a cylinder head held by long studs. The Drive says Adams reported an output of 0.12 watts, equivalent to approximately 1.5 “studpower,” a measure used for Lego engine output. The report does not provide independent testing of that figure.
A Working Model of a Retired Engine
The build makes a little-used engine design understandable through a functioning model. Rather than simply reproducing the outside of an antique machine, Adams’s version uses a governor and valve mechanism to represent how a hit-and-miss engine controlled its operation. Its vacuum-powered adaptation also shows how a builder can preserve some of a mechanism’s logic while changing how it runs.
The output is modest, and the model is not a combustion engine or a practical power source. Its value is in demonstrating mechanical ideas with interlocking Lego components and keeping a historical design visible. For readers interested in mechanical engineering, the project offers a concrete example of how the operating constraints of a model can require changes to the original arrangement.
Lego antique hit-and-miss engine model kit
As an affiliate, we earn on qualifying purchases.
As an affiliate, we earn on qualifying purchases.
How Hit-and-Miss Engines Worked
Hit-and-miss engines were used mainly for stationary work in the early 20th century. Their name describes their speed-control method: a governor allowed ignition when the engine slowed to a certain speed and prevented it when the engine was running fast enough. During a miss, the engine continued cycling without an ignition event. The design also existed in both four-stroke and two-stroke forms, although Adams modeled a four-stroke example.
The Lego project differs from a fuel-powered original because its movement comes from air pressure and vacuum. That change affects how the piston and valve behave, so the model uses a modified cam and rocker setup instead of copying the original mechanism exactly. The Drive presented the build as an example from the broader hobby of making working engines from Lego bricks.
“The modeled hit-and-miss engine is a four-stroke, while the Lego vacuum engine operates on a two-stroke cycle.”
— Delton Adams, in the video described by The Drive
As an affiliate, we earn on qualifying purchases.
Limits of the Reported Performance
The source does not specify when Adams completed or posted the build, nor does it give details of the vacuum supply, test conditions, or how the 0.12-watt output was measured. The performance figure is attributed to the builder through the report, not to independent testing. It is also unclear whether the model has been tested for long-term reliability or demonstrated under a measured load.
The available report describes the mechanism and its components but does not provide full construction plans or a complete bill of materials. The model’s output should not be taken as evidence that it can perform the work of a historical engine; it is a working demonstration, not a commercial power unit.
As an affiliate, we earn on qualifying purchases.
No Further Tests Reported
The source reports no scheduled follow-up, additional test, or planned revision to Adams’s model. The immediate next step for readers seeking more detail is the video by Delton Adams, which The Drive identifies as the demonstration and explanation of the build. Until further information is published, the model’s construction details beyond those in the report and the conditions behind its output figure remain unconfirmed.
As an affiliate, we earn on qualifying purchases.
Key Questions
What is a hit-and-miss engine?
It is an engine that uses a governor to regulate speed by allowing ignition at certain speeds and skipping ignition when the engine is running fast enough. The design was used mainly for stationary power in the early 20th century.
Does the Lego model burn fuel?
No. Adams’s model uses vacuum power, with air pumped in and drawn out, rather than combustion.
How much power does the model produce?
The report attributes an output of 0.12 watts, or about 1.5 “studpower,” to Adams. The source does not describe independent testing or measurement conditions.
Why does the model use a different valve arrangement?
The original engine is a four-stroke design, but the Lego vacuum engine operates on a two-stroke cycle. Adams adapted the cam and rocker arrangement to avoid the piston being pulled out of position under vacuum.
Source: rss
Fall Picks
fall essentials
As an affiliate, we earn on qualifying purchases.
