In brief: General Motors has combined the exhaust manifold with the cylinder head into a single aluminum casting for their 3.6L direct injection V6.
Vehicle in the news
Make/Model: 2012 Camaro
The fusing of the exhaust manifold and cylinder head into one unit means better fuel economy and lower emissions, according to GM. The technology will debut on the 2012 Camaro, which features the 3.6L V6.
The new manifold-head fusions will replace the current cast iron exhaust manifold as well as its six bolts, gasket and heat shield (and its 3 bolts). Eliminating this joint, GM says, removes the potential for manifold gasket failure and reduces engine weight by a total of 13 pounds thanks to the replacement of the iron with aluminum.
The 2012 Camaro 2LS is estimated to get an EPA 30mpg highway. This will be because of the weight reduction and improved airflow that the new combined manifold-head gives.
The 2012 Camaro will see an 11hp improvement in power and 10% better exhaust flow over its 2011 V6 counterpart.
And so ...
Another change is the moving of the catalytic converter to just behind the engine, putting it closer to the source.
Photo credits: GM