Chrysler Group LLC in­IroiIuce Fiat’s 1.4 litre, in-line 4-cylin­der

Shepparton News - Shepparton Car Weekly - - FRONT PAGE -


Group LLC will de­but Fiat’s 1.4 litre, in-line four-cylin­der fully in­te­grated Ro­bitized en­gine (FIRE) fea­tur­ing Mul­tiAir in the Fiat 500 start­ing in 2010. The en­gine, well-suited for a small car ap­pli­ca­tion, de­liv­ers 75 kW at 6750 rpm and 129 Nm of torque at 4250rpm. The 1.4 litre FIRE fea­tures Fiat’s Mul­tiair tech­nol­ogy, which sig­nif­i­cantly re­duces emis­sions while im­prov­ing fuel econ­omy and power de­liv­ery.

The 1.4 litre FIRE fea­tures four valves per cylin­der and in­cor­po­rates state-of-the-art tech­nol­ogy for Fully Vari­able Valve Ac­tu­a­tion (FVVA), also known as Mul­tiAir. Mul­tiAir is a so­phis­ti­cated tech­nol­ogy that de­liv­ers an in­crease in power of up to 10 per cent and a re­duc­tion in fuel con­sump­tion and emis­sions of up to 10 per­cent when com­pared to sim­i­lar en­gines. A turbo ver­sion of the en­gine is also planned and will pro­duce a fuel econ­omy im­prove­ment of up to 25 per cent when com­pared to a V6 en­gine with equiv­a­lent power.

The Mul­tiAir sys­tem con­sists of elec­tro-hy­draulic vari­able valve ac­tu­a­tors filled with con­ven­tional oil, which is in­ter­posed be­tween the camshaft and each valve. A so­le­noid valve is en­er­gized ev­ery 360 de­gree camshaft ro­ta­tion, reg­u­lat­ing the quan­tity of oil ad­dressed to the ac­tu­a­tor or to a reser­voir. The lift of the valve is a func­tion of the quan­tity of oil ad­dressed to the ac­tu­a­tor, rang­ing from full lift to com­plete valve clo­sure. Each so­le­noid valve may also de­lay ap­pli­ca­tion of the ac­tu­a­tor in ad­vance, lead­ing to late valve open­ing or early valve clos­ing. Mul­tiAir is exclusive for Chrysler Group in North Amer­ica and is based on a se­ries of Fiat Pow­er­train patents re­lated to hard­ware, com­bus­tion strate­gies and con­trols that al­low for full con­trol of the lift and tim­ing of en­gine valves.

In the early 1970s, ro­bot­ics in as­sem­bly plants was not com­mon. The term “ FIRE” came into ex­is­tence when Fiat in­te­grated the use of ro­bot­ics in the pro­duc­tion process of man­u­fac­tur­ing plants. Al­though mech­a­nized as­sem­bly is com­mon­place to­day, the brand name FIRE has re­mained with Fiat’s pow­er­train lineup The 1.4 litre FIRE with Mul­tiAir is the world’s first mass pro­duc­tion en­gine to in­cor­po­rate such tech­nol­ogy to con­trol the in­take valves. Ded­i­cated com­po­nents have been de­vel­oped to ac­com­mo­date four “ bricks” ( one for each cylin­der), which pack­age rel­e­vant com­po­nents. Mul­tiAir tech­nol­ogy can be adapted to dif­fer­ent types of en­gines, in­clud­ing Diesels for en­hanced NOx con­trol, and is planned for Chrysler Pow­er­train’s four-cylin­der World Gas En­gine and all­new Pen­tas­tar V6.

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