J-Body History by Generation

Generation 1

The Cavalier Z24 first appeared back in 1985 1/2 and looked much like this one. There was also a quite rare hatchback model.
Generation 1

The 2.8 liter V6 engine was found in all Z24s in the years 85-89. In 1987, the 2.8 was slightly redesigned for better leak control for the 88 model year. This engine produces 120 - 130 HP @ 4800 rpm and 155 ft.lbs torque at 3600 rpm.

Generation 2

Phase I
Generation 2 Phase I

Phase II
Generation 2

The second generation began in 1988. In 88 and 89, the Z24's still had the 2.8, but from 1990 through '94 the Z24 got a 3.1 liter V6, basically a stroke out version of the 2.8. In fact, the 2.8 and the 3.1 share all parts except for the crank and the pistons. The 192 ci. 3.1 V6 pounces the ground with 140 HP @ 4500 RPM and 180 ft.lbs torque @ 3600 RPM. In 1992, GM was able to get the power peaks lower in the RPM range so HP and torque readings were at 4200 RPM and 3200 RPM respectively. In 1991, there were a few revisions made, including the ground effects package and the interior. So 1991-94 became the "Phase II" 2nd gen, while 1988-90 was the "Phase I".

Generation 3

For the 1995 model year, the Cavalier was totally redesigned. The 95 Z came a 2.3 L Quad 4 engine with twin balanced shafts.  This engine put out 150 HP and 145ft.lb of torque.  In 1996, the engine was replaced  the 2.4 liter "Twin Cam" LD9 L4 that puts out 150 HP @ 5600 RPM and 155 ft.lbs torque @ 4400 RPM. This engine received a longer stroke, but smaller bore than the 95 engine.
Generation 3

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