Alfa Romeo 159 1750 TBi

The new 1.8 litre turbocharged Alfa Romeo engine is now officially available in the 2010 Alfa Romeo 159 range, after being previewed to the public earlier this year at Geneva in March. The new model variant is called the Alfa Romeo 159 1750 TBi and is positioned between the 2.2 JTS and the 3.2 JTS.

The 1.8 litre (1,742cc) engine makes a peak torque of 320Nm from just 1,400rpm, and peak power of 200 PS is achieved between 4,750rpm and 5,500rpm. These are very impressive power stats as lots of power is made throughout a rather wide range (thanks to variable valve timing, turbocharging and direct injection).

Alfa Romeo 159 1750 TBi

I believe there’s some very good tuning potential here, at the expense of narrower powerbands as a trade-off. The variable valve timing is configured to set valve overlap times in a way (VVT is on both intake and exhaust) that helps spool up the KKK fixed geometry microcast steel turbocharger up faster. 0 to 100km/h takes 7.7 seconds.

Other than what’s described above, the engine has a few more tricks up its sleeve. The 9.5:1 compression pistons have flexible rings and use materials that are designed to reduce wear. The aluminium alloy cylinder head uses roller rocker arms to help reduce losses through sliding contact by up to 65% at 2,000rpm, compared to normal cylinder heads. In Malaysia, only the 2.2 JTS version is available as of now.

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