A new inlet manifold has been fitted to the Z 20 NET DOHC Turbo petrol engine.
The inlet manifold of the Z 20 NET DOHC Turbo petrol engine, but not of the Z 22 SE, is made from an aluminium alloy.
A new feature is a non-return valve in the inlet manifold, that, depending upon the inlet manifold pressure, directs oil mist from the crank case ventilation directly into the inlet channels of the individual cylinders (see also Chapter entitled "Crank case ventilation").