3
STRATO CHARGED ENGINE
GZ25N
1. OUTLINE OF STRATO-CHARGED ENGINE
1-2 Principle of Operation
Major difference of the Strato-charged Engine to the conventional 2-stroke engine is that as illustrated on the following drawing, there are lead air intake tubes which are connected to the scavenging port via reed valves.
Lead Air Intake Tube
Reed Valve Assy
Carburetor
Air-Fuel Mixture
Scavenging Port
Scavenging Port
Reed Valve
Air
Lead Air
Burnt Gas
Exhaust Port
Due to crankcase depression during the piston upstroke
(intake stroke) to the top dead centre, air-fuel mixture is charged
to the crankcase and lead air is charged to the scavenging
ports though the reed valves.
As piston proceeds to downstroke after the top dead center,
a scavenging port starts to open and lead air in the scavenging
port moves into the cylinder earlier than the air-fuel mixture.
As piston proceeds to upstroke after the bottom dead center,
burnt gas in the cylinder is pushed out through the exhaust
port by lead air. Therefore, direct exhaust of air-fuel mixture
is almost non.
Lead Air
Crankcase
Air-Fuel Mixture
Air
Air-Fuel Mixture
Air-Fuel Mixture
Lead Air
Burnt Gas
Exhaust Port
Air-Fuel Mixture
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