10 replies to this topic

[I hate Brian]

Hi all,

Does the clutch housing breather need plumbing into the carb or just to the atmosphere ?

[Gaz66]

Carb or catch tank

[nicklouse]

Very few cars had the breathers venting to atmosphere.

 

using the original setups that went to the carb or valve and then manifold are very good way of connecting the breathers. The original design of the breathers is actually quite clever as it drops the oil out of the air and returns it to the engine as well as It reducing smell, Helps remove moisture from the engine and creates a lower pressure in the engine.

 

racers Teng to vent to atmosphere via a catch tank of a size required by regulations.

[imack]

Personally, I like to use the breather that was fitted breifly to the early Austin 1300 (around 1967/68 period).
Open to atmosphere with a washable gauze.
Quite rare and difficult to get hold of these days, although they do occasionally turn up.

Attached Files

•  Screenshot_20240302_153507_Gallery.jpg   30.47K   7 downloads
•  Screenshot_20240302_153518_Gallery.jpg   26.92K   7 downloads

Edited by imack, 02 March 2024 - 03:41 PM.

[Ethel]

PCV positive crankcase ventilation.

 

Sucking the blow by fumes out reduces them contaminating the oil and lower than atmospheric pressure in the engine makes it harder for oil to flow past the oil seals. Using the engine intake helps emissions by having another go at burning the fumes.

 

Race engines might lose a tiny bit of power breathing in a small amount of hot gases in place of cold air, but the main reason is they don't generate much manifold vacuum running at wide open throttle, unlike a cruising road car.

[Spider]

For road use, either a PCV or CCV set up - as per factory - without question. Its one thing the factory got very right. It circulates an 'air' flow though the crankcase, drawing off combustion by-products and moisture, reducing acid and 'mayo' build up in the oil as well as the other benefits mentioned by Ethel ^

 

[Ethel]

We shouldn't be surprised burning a hydrocarbon fuel makes a fair bit more water than the fuel we burned.

[I hate Brian]

Hi Guys, so plumbing the timing chain and clutch housing vents into the car will be sufficient ? By the way Spider hello long time no speak hope you're well, what's CCV ? 

Edited by I hate Brian, 05 March 2024 - 05:23 PM.

[Spider]

Hi Brianhater !  Going going OK thanks mate.

CCV = Closed Crankcase Ventilation.

On the later Carbs, they had a Port on them for this system (Blue arrow here);-

 

 

That connects to the Crankcase Oil Separators.

Other than that, be sure the Oil Filler Cap is a Vented type.

[I hate Brian]

Cheers Spider and all who have commented 

[Rorf]

If you're in a rusty environment let it vent to atmosphere and you will have a nice oily engine compartment