Every ounce on a car takes away a bit of its power and fuel efficiency. That is why manufacturers turn to aluminum wherever possible. It is strong, easy to work with and lightweight. Both the intake and exhaust manifolds can be made of aluminum. No matter which manifold is aluminum, it must be properly maintained and cleaned periodically to prevent carbon buildup that will rob the car of power. Carbon and other obstructions will also allow heat to build up in the contaminated areas. This excess heat can burn through an aluminum manifold, making it worthless.
Fill one side of a deep sink with a citrus-based cleaner. Lower your aluminum manifold into the cleaner. Let it soak for no more than five minutes.
Scrub the manifold with a nylon-bristled part brush. Rub the bristles against the aluminum in a small circular motion to loosen any dirt, oil or debris.
Fill the chemical hopper on your pressure washer with hot water and mild liquid dish soap. Place the manifold into the empty side of the deep sink. Spray the manifold with the pressure washer until it is clean.
Inspect the manifold. Locate any areas with carbon deposits, which appear as black, crusty residue. Scrub these spots with the soft wire brush attachment on your rotary tool.
Pressure-wash the manifold with hot, soapy water to remove any remaining debris. Inspect the unit and scrub again as necessary with your rotary tool. Pressure-wash the manifold with clean, hot water.
Dry the manifold with a lint-free cloth. Take your time and wipe every inch of the manifold to be sure it is moisture-free before storing it (or reinstalling it on your vehicle).
