Application of MAN Loop Scavenging in a 125 cc Two-Stroke Racing Engine
SAE-PP-00395
05/08/2024
- Content
- The use of MAN-type loop scavenging port arrangements in a 125 cc two-stroke racing engi-ne is being investigated. These make it possible to provide larger cross-sections for the trans-fer ports, but at the expense of the exhaust port cross-section. The investigation is carried out using 1D calculations with GT-Suite. It is shown that significantly higher maximum outputs are possible in this way. However, this requires large exhaust widths, as otherwise the exhaust port is too small and the advantage of the larger transfer cross-section is overcompensated. Mixed forms between the original MAN loop scavenging and Schnürle loop scavenging can represent a good compromise. One open point is the quality of the scavenging. A study found in the literature on the use of MAN loop scavenging on a small engine shows significantly worse results than is known from large engines. There is still a need for further investigation here.
- Citation
- Eilts, P., "Application of MAN Loop Scavenging in a 125 cc Two-Stroke Racing Engine," SAE MobilityRxiv™ Preprint, submitted May 8, 2024, https://doi.org/10.47953/SAE-PP-00395.