February 11, 2026

INNengine's E-REX Engine Uses Four Spark Plugs and Eight Pistons in a Single Stroke

Jalopnik Tech
automotive engine technology INNengine innovation
The INNengine E-REX is turning heads in the automotive world with its radical departure from conventional engine design. Featuring four spark plugs and eight pistons all operating within a single stroke cycle, the engine promises to deliver power and efficiency in a compact package that challenges traditional internal combustion architecture.

Jalopnik's coverage explores how the E-REX differs from standard two-stroke and four-stroke designs, examining the engineering principles behind its unusual configuration. The engine's developers claim it could offer significant advantages in weight, size, and fuel efficiency, potentially finding applications in range extenders for electric vehicles and other hybrid powertrain solutions.
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