This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Optimizing Race Engine Performance One Cylinder at a Time
ISSN: 0148-7191, e-ISSN: 2688-3627
Published December 01, 1994 by SAE International in United States
Annotation ability available
Performance of multicylinder engines is dictated by the sum of the contributions from the individual cylinders, each of which must be optimized to maximize the total output. Cylinder-to-cylinder imbalance causes each cylinder to operate differently, making individual-cylinder optimization a challenge. Unfortunately, cylinder-to-cylinder imbalance exists in all multicylinder engines, even those in which careful steps are taken in design and manufacturing to prevent it. While optimizing each cylinder of a multicylinder engine in high-volume production applications is not feasible, it is feasible in racing applications and can provide a significant competitive advantage.
This paper investigates causes of cylinder-to-cylinder imbalance and discusses techniques to optimize race engine performance one cylinder at a time through the systematic optimization of individual-cylinder intake valve closing, spark timing, and compression ratio.
CitationRandolph, A., "Optimizing Race Engine Performance One Cylinder at a Time," SAE Technical Paper 942488, 1994, https://doi.org/10.4271/942488.
- Randolph, A. L. “Cylinder Pressure-Based Combustion Analysis in Race Engines,” SAE 94xxxx 1994 Motorsports SAE Conference
- Asmus, T. W. “Valve Events and Engine Operation,” SAE 820749
- Puzinauskas, P. V. Eves, J. C. Tillman N. F. “Measureing Absolute Cylinder Pressure and Pressure Drop Across Intake Valves In Firing Engines,” SAE 941881
- Pischinger, S. Heywood J. B. “How Heat Losses to the Spark Plug Electrodes Affect Flame Kernel Development in an SI-Engine,” SAE 900021
- Groff, E. G. Sinnamon J. F. “The Effects of Ignition Location in a Swirl Field on Homogeneous-Charge Combustion,” SAE 821221
- Puzinauskas, P. V. “Examination of Methods Used to Characterize Engine Knock,” SAE 920808
- Xiaofeng, G. Stone, R. Hudson, C. Bradbury I. “The Detection and Quantification of Knock in Spark Ignition Engines,” SAE 932759