The 993’s air-cooled flat-six engine was based on the 964 engine before it: with a capacity of 3.6 litres, it was naturally aspirated of course, and twin-plug too, putting out 272hp and 330Nm.
Then, in 1995, Porsche introduced a new intake technology to the flat-six engine called VarioRam. This essentially varied the inlet tract length at different speeds to boost torque at lower speeds. Overall power was indeed boosted marginally to 285hp, with torque up to 340Nm, but the real-world difference was felt in the mid-range, VarioRam cars offering a stronger pull in response to a prod of the gas pedal.
