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What does blow by mean on a crankcase?

What does blow by mean on a crankcase?

The more correct name is ‘piston blowby’ and is a result of worn cylinders/pistons/piston rings, or a combination of all three, allowing compression and combustion gases to bypass the piston ring seals and enter the crankcase/oil pan, generally giving rise to oil leaks and clouds of smoke from the breather and exhaust systems.

What happens when the crankcase is entered into the engine?

Once entered into the crankcase, the atmospheric pressure begins to build. This superheats the air and oil – far faster than what the engine was designed to withhold, consequently boiling the oil into a miasma of oil mist and fuel vapor.

Why is it important to remove blowby gases from crankcase?

Removing the blowby gases from the crankcase is especially important on 360 degree engines as the simultaneous rise and fall of both pistons moves a huge amount of air within the crankcase. 180 degree engines on the other hand, tend to just move the air around the crankcase.

Can a oil catch be added to a crankcase?

The addition of a oil catch can will only serve as an extra filter – a preventative measure.

The more correct name is ‘piston blowby’ and is a result of worn cylinders/pistons/piston rings, or a combination of all three, allowing compression and combustion gases to bypass the piston ring seals and enter the crankcase/oil pan, generally giving rise to oil leaks and clouds of smoke from the breather and exhaust systems.

What are the particle numbers in a crankcase blowby?

Particle number emissions in crankcase blowby are illustrated in Figure 3, which shows particle numbers in the crankcase blowby and in the diluted exhaust gas over the UDDS drive cycle.

What happens if the crankcase breather is not working?

If the crankcase breather is not working correctly, it can cause damage to other parts of the engine. Seals and pistons are susceptible to faster wear and tear when pressure is increased. If you have to constantly replace these items, it’s probably time to clean the crankcase breather.

The addition of a oil catch can will only serve as an extra filter – a preventative measure.

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Ruth Doyle