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Question what is blow by and blow down phenomena in ic engine?

Question Submitted By :: Mechanical Engineering I also faced this Question!! Answer Posted By

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Answer# 1

Blow-by occurs when the explosion that occurs in yourengine's combustion chamber causes fuel, air and moistureto be forced past the rings into the crankcase. Yourengine's rings must maintain an excellent fit in order tocontain the pressure.

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

Is This Answer Correct ? 24 Yes 2 No

kk

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Answer# 2

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

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

Is This Answer Correct ? 7 Yes 1 No

logachandran.v

Answer# 3

the escaping out of combustion gases through piston ringsto the sump/oil pan is known as blow by. these gases alsotakes out some contants of oil with them.

Is This Answer Correct ? 5 Yes 8 No

manoj yadav

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what is blow by and blow down phenomena in ic engine? http://www.allinterview.com/showanswers/109959/what-is-blow-by-and...

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