The Ram 4500 Camshaft provides the necessary timing of the valves that allows heavy-duty pickups to run clean and pull hard. Composed of robust steel or cast iron, the Camshaft revolves at half crank speed with the help of a chain or belt in steep towing. The 4500 lineup features three different Camshaft layouts. There's the tough block-mounted OHV one, an agile SOHC, and a high breathing DOHC. Each of these engines is tuned to provide maximum low end torque as well as high rev power. With variable timing on select 4500 trims, the Camshaft can rotate slightly under load, which sharpens throttle response, trims fuel use, and cuts tailpipe emissions without any additional complexity for the driver. This concentration on intelligent movement gives the Ram its characteristic reliability, as the lobe of every Camshaft meets its follower with a clean oil film preventing scuffing and, ultimately, misfiring. Depending on whether a crew is using a gasoline HEMI or the mighty Cummins diesel, the 4500's Camshaft balances grunty torque with genteel behaviour for confident highway merges and sensible downhill control. The component also contributes to system safety in a quiet fashion, as accurate valve events provide a steady vacuum that helps power brakes and also maintains the constant exhaust flow that optimizes aftertreatment temperatures in any given Ram. The core Camshaft design is applied across all Ram 4500 with minimal differences. From regular to chassis cab and four-wheel drive, it is simple and easy to plan parts and reduce downtime when the service finally comes. Among the new highlights is a low friction surface polish with carefully profiled lobes extending oil life, allowing Ram trucks to rack high mileage with the same Camshaft in place. Overall, the Ram package makes the 4500 platform a favorite among fleet managers wanting equipment that will do the job day in and day out.
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