Lawn Mower Internal Combustion Engine

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Lawn Mower with Internal Combustion Engine



The engine is designed to power a lawn mower blade in order to cut grass faster, easier, and more efficiently than man powered mowers and previous engine models. The engine in particular that was dissected and analyzed was a four-stroke lawn mower engine manufactured by Briggs and Stratton.

How It Works

This engine works on a four-stroke cycle. A manual crank starts the cycle while creating a vacuum to draw gas and air into the cylinder. Concurrently, an electrical current is produced to create a spark which would ignite the fuel-air mixture compressed in cylinder by the piston. This piston turns the camshaft through a linear-to-rotational energy conversion. The camshaft then turns the output of the motor, which is a blade, to cut the grass.

Briggs and Stratton four-stroke engine

For a detailed bill of materials for the engine, refer to the following link:

Dissected Parts to an Internal Combustion Engine

Parts Analyzed for Design Decisions and Critical Features

Analysis of Engineering Specifications

Front View
Top View
Isometric View

Engineering Specifications Verified Quantitatively

Dynamic Simulation

<embed src="" type="application/x-shockwave-flash" width="425" height="350"></embed>

Right-click and select "Save Target As" to download the video (.avi format).

See also Four Stroke Internal Combustion Engine on YouTube, modeled by the same authors.


How Stuff Works: Internal Combustion

Briggs and Stratton

Bucknell Mechanical Design


All writing, CAD models, dynamic simulation, finite element analyses, and dissection photos by Matthew D'Agostino, Eric Oswald, and Stephen Parker - Bucknell University mechanical engineering students, class of 2008.