Toro 303447 - Page 11

COMPRESSIONstroke:withbothintakeandexhaustvalvesclosed,thepistonreturnstothetopofthe
cylindercompressingtheair,orfuel‐airmixtureintothecombustionchamberofthecylinderhead.
Detail
PistonmovesfromBDCtoTDC
Intakevalveclosed
Exhaustvalveclosed
Pistonmovementreducesthe
volumeofthecombustionchamber‐‐increasespressure.
Pressureofcompression=60to80psi.
Anypressurethatescapesreducestheperformanceoftheengine.
360degreesofrotation