ok explain this---pape 117 7.j.12 CLASS UG and UF:any reciprocating engine which uses the otto cycle may run in Streamliner category only.Supercharged engines do not advance class size
Ot·to cy·cle [ óttō sk'l ] (plural Ot·to cy·cles)
noun
Definition:
thermodynamic process: a thermodynamic process for the conversion of heat into work, e.g. the sequential suction, compression, ignition, and expulsion in a four-stroke engine
willie buchta