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Fiat 500 TwinAir
"... In MultiAir's case, Fiat implemented an electro-hydraulic valve actuation system (inspired from the Common Rail technology), which uses a high pressure chamber, fitted in between the cam and engine intake valve. The volume of the oil inside the chamber can by adjusted through an on-off solenoid valve controlled via its own electronic unit. By doing so, Fiat's system is capable of controlling the air mass and its pressure in each cylinder and at every stroke of..." Continue Reading →
Photo credits: Fiat
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