Engine Breathers.

[clean55]

Hi guys,

 

So i got a defect notice for my engine breathers venting to atmosphere, I'm running twin side drafts and i have no idea how i can get them to run legally without drilling into the inlet manifold, which I'm not doing.

 

any help/previous solution would be awesome thanks guys!

 

-Kim

[B.L.Z.BUB]

Run it to a catch can. Then run a line from the catch can to your charcoal canister.

[altezzaclub]

Does the rear tappet cover hose go anywhere?

 

You can't vent it straight to atmosphere, you'll have to run a PCV to get it off the defect. T-piece where fresh air goes in and out of your little filter into the brake booster line which will recycle the blowby into the inlet manifold. That's the yellow dots in the photo.

 

The other half of it, you might get away with what Reed said and run it into a charcoal cylinder. In theory it is meant to go into the air cleaner so it draws clean air in when the PCV sucks the crankcase clean, and it bleeds crank oil vapour into the air cleaner when the motor idles.

 

Without an air filter box it is impossible to make it work as they want it to, so if you can get away with the charcoal canister then go for it. That's the green dots in the photo.

[clean55]

Both my lines run to ATMOS at the moment.

 

So yours saying for the yellow dotted line I should run it into, the brake booster line with a t piece?

 

and I'm a little confused as by how/where to run the green dotted line because if i run the green dotted line into the charcoal canister, is it going to be able to breathe? (i still have no ʞ©$ɟign idea what the point of a CC is let alone what it does)..

 

thanks for the response guys need all the help i can get haha.

[altezzaclub]

The yellow dotted line has the PCV valve in. It gets sucked shut under hard vacuum, (at idle and very-light-throttle cruise) but opens when the inlet manifold vacuum collapses when you accelerate. That lets the greatest amount of blowby (hard acceleration) get sucked into the inlet and burnt.

 

So fit a PCV in the line and T-piece it into the brake line, or thread a fitting into the inlet manifold like I did.

 

Then to replace the air getting sucked out by the PCV (not much) you need a line in, and also to allow the vapours out when the motor is idling with the PCV shut, the other line went to the air cleaner. So air goes in and out of that, depending on what the motor is doing.

 

The KE70 has a can full of charcoal that absorbs the petrol vapour when the car is sitting parked on a hot day, and then allows the motor to flush it back out with clean air when you drive away. So the green line goes to a charcoal canister, it only needs to be a 5mm line as not much goes in and out unless your rings are bad. The charcoal canister vents to the atmosphere inside a chassis rail.

 

I've ringed the charcoal filter in yellow on your picture here... didn't you know what that thing did?

 

Do you have the dizzy vac advance connected??

[bruce]

Another option could be to replace the sock filters on the Webers with something like K&N filters. They might have a connection so you can run a hose to the outlet where you have your little filter on the rocker cover.

 

How did you get defected? Random inspection from a transport official or pulled over by a cop?

[Mark90]

Don't mean to hijack this thread, but I'm assuming this means that this setup is illegal?

 

[altezzaclub]

I assume they all are, unless it used to vent to air when it left the factory, like my 1949 Armstrong Siddeley.

 

By the 1960s the car makers were hooking the tappet covers up to the air cleaners to burn the fumes, and then they started actively scavenging the crankcase with PCV systems that sucked the fumes out.

 

I suppose it only ever matters if you try to register the car in another State and someone looks at the engine venting more carefully.

[Taz_Rx]

What engine us that mark? Side exit vent and 4 bolts holding tappet cover down! :hmm:

[Mark90]

12R, in my RT81 Corona. There's a thread for it lurking somewhere.

[lexsmaz]

As has been said, I would put a T piece into your brake booster Vac line & hook up the line running from your rocker cover which still has the PCV valve in it & I think the best other option with the breather / filter on your rocker cover is to replace the air filters units totally with 2 of the paper style side draught carby ones that used to be around years ago, ( I assume they are still available ) they have a metal base & metal top & you could hook up a fitting for the breather into the base or top of the metal plates .. I think if you hook it up to the Carbon canister it wont pass, plus you still have not got any way of drawing the fumes back out of the carbon canister as you wont have any Vac line to that at the moment either ... Having the PCV system working & all fitted up is a good thing as it draws out Noxious fumes, which are really bad to breathe in & also helps keep the oil a bit cleaner too, helps a bit in stopping sludge formation ..