A Study of the Effects of Ceramic Valve Train Parts on Reduction of Engine Friction 970003

We developed a quantitative evaluation method based on observation of torque wave due to valve train friction. We evaluated the reduction of energy consumed in one cam drive cycle. The result of torque wave analysis shows the Si3N4 adjusting shim with a mirror-finished surface reduces valve train friction by 25%-30% in some limited range of engine speed. We discussed that by what means the reduction in valve train friction was being achieved and that the oil film parameter Λ, according to the EHL(Elasto-Hydrodynamic Lubrication) theory.


Subscribers can view annotate, and download all of SAE's content. Learn More »


Members save up to 43% off list price.
Login to see discount.
Special Offer: With TechSelect, you decide what SAE Technical Papers you need, when you need them, and how much you want to pay.