Saturn S series Twin Cam cylinder head had now featured a new roller-rocker setup with hydraulic tappets and roller cams replacing the conventional bucket lifter setup of the previous engine in the S series. Also introduced for the 1999 model year S-series vehicles that were sold in California was a different type of an exhaust manifold that housed an upstream catalytic converter (this converter had heated up much faster than the conventional unit, and it had also decreased exhaust emissions faster as well), and it also had provisions for an air-injection reaction system (This had injected fresh air into the exhaust to reduce
Exhaust heat recovery system studies a Rankine system for long distance vehicles that could lead to 10% fuel savings. The goal is to produce enough energy to feed the components and electronic auxiliaries with electricity and reduce the fuel consumption by reducing the load on the alternator. Double Arrow Engineering's WildFire Heat Recovery System (WFHRS) is underdevelopment and utilizes wasted heat from both coolant and exhaust. This system mechanically adds power back to the drive-line, utilizing a Rankine engine as the energy conversion method. The WFHRS is designed for a verity of different applications, both fixed and variable RPM, aftermarket and OEM applications, but