How does the Prius’ Atkinson-cycle engine differ from traditional gasoline engines?

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How does the Prius’ Atkinson-cycle engine differ from traditional gasoline engines?

The Prius engine is optimized for fuel efficiency rather than power. Discussing its unique operation and maintenance requirements can help owners understand performance characteristics and longevity.

Zarnish asked on 12 Feb 2025 16:32:22 pm

1 Answer

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Car Mechanic Expert - on 12 Feb 2025 16:38:41 pm

The Atkinson-cycle engine is designed for fuel efficiency rather than power, using a unique intake valve timing mechanism.
It has a lower compression ratio compared to traditional engines, which helps to reduce fuel consumption.
It runs more efficiently at lower RPMs and is paired with an electric motor to maximize hybrid system benefits.
Maintenance typically involves more attention to oil changes, fuel injectors, and cooling systems.