Variator

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A variator is a device that can change its parameters, or can change parameters of other devices. Often a variator is a mechanical power transmission device that can change its gear ratio continuously (rather than in steps).

[edit] Alfa Romeo/FIAT Variator

Variator is the name for the Alfa Romeo and FIAT variable valve timing device. It is used on the inlet camshaft or the TwinSpark generation engines. It works using oil pressure from the engine, which is controlled by the variator solenoid. When engine revs are above 3k revs the solenoid energizes, causing oil pressure to be directed through the inlet camshaft into the variator. The Fiat Stilo with the 1.8l or 2.4l engines and Alfa Romeo 1.4l, 1.6l, 1.8l and 2.0l (all 16V versions produced after 1996) use a variator.

If the petrol engine sounds like a diesel briefly after starting, it means that the variator is worn and should be replaced. Variators are best replaced at the same time as the timing belt.