What are breather caps for? How do they differ in operation from PCV's?
2007-03-19 00:47:39 · 8 answers · asked by deejaytwist2002 1 in Cars & Transportation ➔ Maintenance & Repairs
A breather cap allows fresh air to enter the crankcase.
The PCV Valve is connected to a vacuum on the intake manifold,. The purpose of the PCV valve is to remove any trapped unburnt gases/moisture within the crankcase & sends them through the combustion process again. Without the breather it would be like putting your finger over the end of a straw, & then suck in. Nothing happens. Air must be let in in order to draw air out.
2007-03-19 01:23:16 · answer #1 · answered by Mr. T 7 · 0⤊ 0⤋
Breather Cap
2016-12-17 13:24:03 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Oil Breather Cap
2016-10-18 23:26:50 · answer #3 · answered by ? 4 · 0⤊ 0⤋
Let's see if we can get this right.
The piston rings in even the best engines leak a bit, this is called blowby. Blowby gases build up in the crankcase. Before pollution controls, blowby was vented to the outside air with a breather cap, with is simply an open cap with an oil/vapor separator screen.
Once of the very first pollution control systems was positive crankcase ventilation, or PCV. With this system, the crancase is SEALED. Because it's sealed, blowby gas builds pressure in the crankcase. A hose will connect the crankcase to the intake manifold, relieving pressure into the intake manifold. The PCV valve is located in this hose to ensure that gas flows only in the direction of the manifold. Blowby gas is drawn into the intake manifold, flows back into the cylinder, and burns up.
In a PCV sytsem, there is no fresh air vent in the crankcase. This occasionally results in a partial vacuum, due to low manifold pressure. A vacuum actually helps engine performance, and prevents leakage. However, if the PCV hose or valve is clogged, it can cause the engine to stall due to high pressures building up in the crankcase.
2007-03-19 02:05:03 · answer #4 · answered by anywherebuttexas 6 · 0⤊ 0⤋
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RE:
What are breather caps for?
What are breather caps for? How do they differ in operation from PCV's?
2015-08-19 08:14:10 · answer #5 · answered by Alaa 1 · 0⤊ 1⤋
PCV's use vacuum to ventilate the crank case. Breather caps should be connected to the air box and work by pressure built up in the crank case from blow-by.
2007-03-19 01:16:44 · answer #6 · answered by Lab 7 · 0⤊ 0⤋
They ventilate the engine sump to outside air through a filter. Gases passing the piston rings would otherwise build up in the sump. They carry oil vapor and unburnt hydrocarbons, which are pollutants.
A PC valve is returns the built-up gases to the engine intake manifold where they are burnt by the engine. The crankcase is ventilated by a supply of air from the main air cleaner and then drawn into the engine where the oil vapour and gases are reburnt.
http://www.autoshop101.com/forms/h63.pdf
2007-03-19 01:23:31 · answer #7 · answered by Anonymous · 0⤊ 0⤋
breather caps allow pressure to escape to the air
the pressure build is in the form of a gas up from heat
a PVC valve is a one way valve stopping the pressure
or noxtious fumes returning to the sytem or part of the internal part mechanical device it came from
2007-03-19 01:14:11 · answer #8 · answered by knine000 1 · 0⤊ 0⤋
The function of the PCV is to draw excess gas out of the crank case and make use of it by directing it back to the manifold.
2007-03-19 01:18:30 · answer #9 · answered by deomarco923 1 · 0⤊ 0⤋
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2015-08-04 12:54:11 · answer #10 · answered by Anonymous · 0⤊ 1⤋