What's this about then?

[chinkamon]

Flicking through eBay for things I don't want, can't afford, an don't need, and came across this cortina. Was looking at the oil breather pipes.

Mine just has an elbow coming out the block an drips and breathes onto the floor/driveway like ford intended 

This chap has a breather/catch can loop on his from the block then into the rocker cover.

Apart from no drips is there any reason for this?

[DT36]

More modern MOT and emissions go somewhere along the lines that a PCV (positive crankcase ventilation) valve cannot directly vent out and must either recurculate or be caught. 

While the crank rotates in the bottom of the engine you get oil misting. On top of that, you also have some piston ring blow by and also the underside of the piston travelling down, building up pressure in the sump. If pressure got too much then it would force oil past the sump gasket or crank seals. This is where the PCV valve comes in to help with balancing the pressure in the sump to prevent oil leaks and with recurculating the mist

Remember the XR3i Escorts with the CVH engine. You'd know if you were driving behind one of those with a blocked PCV valve. Always had that smell to them. 

Catch tanks tend to be used on race cars, track cars and joking rally cars to get passed scrutineering regs or an MOT. I think the line of thought is that without any oil recurce, then there's less chance of the spark plugs getting fouled. 

Edited October 12, 2022 by DT36

[Miniliteman]

https://www.burtonpower.com/tuning-guides/tuning-guide-pages/engine-breather-system.html

[katana]

Quote

This chap has a breather/catch can loop on his from the block then into the rocker cover.

I don't see that? I see two rocker cover pipes routed around to the catch can! The rise in the hoses not a bad thing as any oil mist that condenses can drain back to the engine. I thought that X-flows crankcase venting arrangement was best, From crankcase into rocker cover then separate pipe from rocker cover to can? Maybe this guy has a heavy breathing engine?

[chinkamon]

4 hours ago, DT36 said:

More modern MOT and emissions go somewhere along the lines that a PCV (positive crankcase ventilation) valve cannot directly vent out and must either recurculate or be caught. 

While the crank rotates in the bottom of the engine you get oil misting. On top of that, you also have some piston ring blow by and also the underside of the piston travelling down, building up pressure in the sump. If pressure got too much then it would force oil past the sump gasket or crank seals. This is where the PCV valve comes in to help with balancing the pressure in the sump to prevent oil leaks and with recurculating the mist

Remember the XR3i Escorts with the CVH engine. You'd know if you were driving behind one of those with a blocked PCV valve. Always had that smell to them. 

Catch tanks tend to be used on race cars, track cars and joking rally cars to get passed scrutineering regs or an MOT. I think the line of thought is that without any oil recurce, then there's less chance of the spark plugs getting fouled. 

Wow I had to read that a few times to absorb it all.

Makes sense though, I wasn't sure as it's the same motor as mine an obviously went to an effort to install it all, an so wondered if it's worth going to the same effort on mine

[chinkamon]

3 hours ago, Miniliteman said:

https://www.burtonpower.com/tuning-guides/tuning-guide-pages/engine-breather-system.html

Mines 63 so I wonder if mine just scraped by before the valve came in, mine literally a hose pointing to the floor 😂

[chinkamon]

2 hours ago, katana said:

I don't see that? I see two rocker cover pipes routed around to the catch can! The rise in the hoses not a bad thing as any oil mist that condenses can drain back to the engine. I thought that X-flows crankcase venting arrangement was best, From crankcase into rocker cover then separate pipe from rocker cover to can? Maybe this guy has a heavy breathing engine?

The pipe from the front goes further down from the rocker cover, drops down toward where the crank is, like in the white pic, as I say mines just a bit of pipe so thought he had reasons for changing his

[Veemax]

On 12/10/2022 at 20:07, chinkamon said:

Mines 63 so I wonder if mine just scraped by before the valve came in, mine literally a hose pointing to the floor 😂

yeh thats bog std for the day, mine was the same, unless its dripping oil dont worry about it, yr car dont need emission test anyway, i think all that pipework on his car is over the top an not needed unless as said its an old smoker or a race car of some sort an scrutineering will require a catch can of some sort

 

[Snapper]

Just to add some clarity, if you do have an engine with PCV from block then this is activated by inlet manifold vacuum, if you vent the PCV to a catch tank it won’t work as there is no vacuum to operate the valve. Remove the PCV and pipe crank case and rocker cover to a vented and baffled catch tank

[chinkamon]

On 27/10/2022 at 07:31, Snapper said:

Just to add some clarity, if you do have an engine with PCV from block then this is activated by inlet manifold vacuum, if you vent the PCV to a catch tank it won’t work as there is no vacuum to operate the valve. Remove the PCV and pipe crank case and rocker cover to a vented and baffled catch tank

Good point! The valve wouldn't open would it, well mine is the good ol' fashioned dump it on the road job. So that's how it'll stay haha