Lower+Intake+Manifold

toc The **Lower Intake Manifold** is the lower intake collector and the final step in the intake air's path before it reaches the cylinder head.



=Function & Location= The Lower Intake Manifold is located between and above the two cylinder heads, and underneath the Upper Intake Manifold. It provides mounting points for the fuel rail and has ports allowing injected fuel to enter the combustion chamber via the cylinder heads. It also provides a mounting point for the upper timing belt idler pulley & stud.

=Versions= There are two versions of the Lower Intake Manifold, which correspond with the phases for Fuel Injectors. When retrofitting Phase II injectors into a Phase I engine, a traditional way of adaptation was to machine the Lower Intake Manifold to accept a Phase II fuel rail. Today, there are adapter kits and alternative fuel rails available which make retrofitting a drop-in replacement job.
 * =  ||= Non-Turbo ||= NA (Convertible) ||= Twin Turbo ||
 * = Phase I ||= 1990-1992 ||= 1993 ||= 1990-1994 ||
 * = Phase II ||= 1993-1996 ||= 1994-1996 ||= 1995-1996 ||

=Associated Seals & Gaskets= The Lower Intake Manifold has three surfaces which require gaskets or seals:
 * Upper Intake to Lower Intake Plenum Gasket.
 * Lower Intake to Head Gasket.
 * Fuel Rail Insulators.

=Related Articles= Parts (Category)