Quick Breather Question(s)

[v6Max 0]

Just after an explanation if possible;

 

The standard oil filler has two connections on the cap; one goes to the TB the other to a metered hole in the air inlet duct just after the AFM. Then the oil filler itself has a breather hose connected to it that comes from the block and of course the oil filler hose itself.

 

My understanding is that oil vapour is returned, ultimately, to the inlet plenum so that it can be burnt off in the engine but why the 2 connections on the filler cap? Why not just the narrow bore one to the TB or just the other one to the air inlet duct? I know I'm missing something obvious.

 

Is there anything that prevents you blocking off, for example, the narrow feed to the TB and then routing the other feed(s) to a catch tank? I know you would need to ensure that the existing feeds are properly blocked otherwise you'd end up with unmetered air.

 

Thanks.

[tom_m 0]

Is there anything that prevents you blocking off, for example, the narrow feed to the TB and then routing the other feed(s) to a catch tank? I know you would need to ensure that the existing feeds are properly blocked otherwise you'd end up with unmetered air.

 

Thanks.

 

nope nothing at all. i blocked off the pipes on the inlet and the smaller pipe on the filler cap and used a hose on the large bore outlet on the filler cap into a vittel bottle.

 

just be sure you don't seal what ever you use as a catch tank or you'll blow oil out the dipstick! i poked some holes around the top of the bottle with a hot skewer to prevent this.

[Rom 0]

IVe been searching for threads on breathers / catch tanks. Come across a few helpful ones

 

Im makign one up for my Mi..and im wondering. The breather from top of filler cap, splits to a small bore pipe to TB. Then onto the Inlet pipe between TB and AFM. What does this small pipe do ? Does it perform some soem useful function...Im just worried it will effect the running.

Cant understand why it is there, and why there isnt just a pipe to the Inlet pipe,whats this tee piece do !!

 

And lastly, is there any need to have the cam cover breather to the catch tank ? My main intention is to stop breathers going back into inlet. Im thinking i can leave the cam cover as intended, as all the build up is in filler anyway, so that seems best place to take the vent from.

 

Cheers