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Short answer timing belt...

Long answer The lightweight pressure-cast aluminum cylinder head's exhaust ports are on its front side (vs. the previous engine's back-side ports) so the close-coupled catalytic converter can mount directly to the head without a separate exhaust manifold. The dual overhead cams (with improved journal finish to reduce friction) and four valves per cylinder are driven by a silent chain with a friction-reducing double-arm tensioner. A pair of chain-driven counter-rotating shafts in the oil pan take care of the second-order harmonic vibrations common to I-4 engines.

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11y ago

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