Answer / kk

Blow-by occurs when the explosion that occurs in your
engine's combustion chamber causes fuel, air and moisture
to be forced past the rings into the crankcase. Your
engine's rings must maintain an excellent fit in order to
contain the pressure.

Blowdown is the amount of time/distance/degrees between
exhaust port opening and transfer port opening.
The absolute most accurate description of blowdown would
be... the amount of TIME between the exhaust and transfer
port openings. This "measurement" would of course only be
accurate at one rpm, so blowdown is commonly referred to in
degrees of crank rotation.

Answer / logachandran.v

Blow by: When the equal pressures at the top and bottom of
the piston of an IC Engine exists it won't work and it will
blast. To avoid this situation the blower is used at the
bottom of the piston(crank case)ie., Creating negative
pressure inside the cylinder.

blow down: time lap between fresh charge entering into the
cylinder through inlet and exhaust through exhaust valve.

Answer / manoj yadav

the escaping out of combustion gases through piston rings
to the sump/oil pan is known as blow by. these gases also
takes out some contants of oil with them.

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