This book is mainly useful for the researchers in the field of bio-diesel application to Diesel engines. Neat bio-diesel application on Diesel engine is still under research. The compression ratio is one of the important design parameter to vary along with neat preheated biodiesel application. It improves the performance and combustion characteristics. In this book combustion, performance and emissions are discussed elaborately with experimental results. This book also gives the guidelines for bachelors and masters degree engineering students to do project works in the field of bio-diesel applications.