Quick Answer: The Petrol Engine Model Four Stroke is a sectional model of a four-stroke spark-ignition engine, turned by a hand-cranked flywheel. An overhead valve assembly driven by an internal camshaft and a light indicator timed to the compression stroke show the Otto cycle step by step.
Last updated: October 2026
Key Features
Sectional four-stroke, spark-ignition engine
Hand-cranked flywheel for turning the cycle slowly
Overhead valve (OHV) assembly driven by an internal camshaft
Light indicator synchronised to the peak of the compression stroke to show ignition
Cast alloy frame with aluminium components
Technical Specifications
Specification
Value
Engine type
Four-stroke, spark-ignition (sectional)
Drive
Hand-cranked flywheel
Valves
Overhead valve (OHV), internal camshaft
Ignition simulation
Light indicator at compression stroke peak
Materials
Cast alloy frame, aluminium components
About This Product
Turning the flywheel by hand lets students follow the intake, compression, power and exhaust strokes and see how valve timing and spark timing are tied to piston position. It is used in automotive engineering labs to explain the Otto cycle.
Frequently Asked Questions
How is ignition shown on the Petrol Engine Model Four Stroke?
A light indicator is synchronised to the peak of the compression stroke, marking the point where the spark would fire.
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