Alloy oil breather
31-07-2007, 10:23 AM
#1
Advanced PassionFord User
Thread Starter
Alloy oil breather
Can someone explain to me how an after market alloy oil breather should be plumbed on a RST engine??A clear picture or diagram would help too.Thanks,Micky
31-07-2007, 11:52 AM
#2
Advanced PassionFord User
Join Date: May 2003
Location: hampshire
Posts: 1,871
Likes: 0
Received 0 Likes
on
0 Posts
top left outlet goes to the left hand outlet on the rocker cover, the top one facing forwards goes to the right side rocker cover outlet, the bottom outlet goes to the oil return outlet on the back of the block just below where the breather is mounted
31-07-2007, 03:23 PM
#3
PassionFord Regular
Join Date: Jul 2004
Location: n.e.scotland
Posts: 481
Likes: 0
Received 0 Likes
on
0 Posts
oil breather
i have a braether on my s2 running mfi,and the breather i got also had a vent to atmosphere,the car would just die when i turned it over,when i took the filter off(the one venting to atmosphere)and plumed it in to the inlet like the standard one is it runs away fine why is this then...? 
31-07-2007, 04:30 PM
#4
Advanced PassionFord User
Thread Starter
Re: oil breather
Originally Posted by turboloon
i have a braether on my s2 running mfi,and the breather i got also had a vent to atmosphere,the car would just die when i turned it over,when i took the filter off(the one venting to atmosphere)and plumed it in to the inlet like the standard one is it runs away fine why is this then...?
31-07-2007, 04:34 PM
#5
Advanced PassionFord User
Thread Starter
Originally Posted by sm
top left outlet goes to the left hand outlet on the rocker cover, the top one facing forwards goes to the right side rocker cover outlet, the bottom outlet goes to the oil return outlet on the back of the block just below where the breather is mounted
You dont seem to have it connected to the bottom off the fuel distributer though???What did you do about the hole thats left in the side of it???Regards,Micky
31-07-2007, 07:28 PM
#6
15K+ Super Poster!!
The bottom outlet to block, the middle two to the rocker cover, and the very top should goto atmosphere.
You need to disconnect the original breather from the metering head, and block the metering head off.
If the breather has a small port for connection to the inlet manifold vacume - block it off - don't connect it to the inlet.
The reason they have them, is by law u are not supposed to vent fumes to atmosphere, but it's bad for the engine to feed them back to the inlet. You will find that with the breather fitted, you will have much reduced oil consumption, and clean intercooler/boost pipes.
Also, when u run to atmosphere, u may find the idle is a touch rich. This is because the engine was previously using the air in the crankcase, which is now totally isolated.
Rick.
You need to disconnect the original breather from the metering head, and block the metering head off.
If the breather has a small port for connection to the inlet manifold vacume - block it off - don't connect it to the inlet.
The reason they have them, is by law u are not supposed to vent fumes to atmosphere, but it's bad for the engine to feed them back to the inlet. You will find that with the breather fitted, you will have much reduced oil consumption, and clean intercooler/boost pipes.
Also, when u run to atmosphere, u may find the idle is a touch rich. This is because the engine was previously using the air in the crankcase, which is now totally isolated.
Rick.
31-07-2007, 09:09 PM
#7
Advanced PassionFord User
Thread Starter
@ Rick,nice technical reply,thanks. Now can I pick youre brains with another question!!!Could you keep the origional Ford pipe connecting the block to the right hand exit from the cam cover,then connect the alloy breather on the left hand exit off the cam cover by a middle outlet.Vent the top connection of the alloy breather to atmosphere and block off the unused middle outlet and the bottom outlet of the breather???? Regards,Micky
Now can I pick youre brains with another question!!!Could you keep the origional Ford pipe connecting the block to the right hand exit from the cam cover,then connect the alloy breather on the left hand exit off the cam cover by a middle outlet.Vent the top connection of the alloy breather to atmosphere and block off the unused middle outlet and the bottom outlet of the breather???? Regards,Micky
Trending Topics
31-07-2007, 10:38 PM
#8
PassionFord Regular
Join Date: Jul 2004
Location: n.e.scotland
Posts: 481
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Rick
The bottom outlet to block, the middle two to the rocker cover, and the very top should goto atmosphere.
You need to disconnect the original breather from the metering head, and block the metering head off.
If the breather has a small port for connection to the inlet manifold vacume - block it off - don't connect it to the inlet.
The reason they have them, is by law u are not supposed to vent fumes to atmosphere, but it's bad for the engine to feed them back to the inlet. You will find that with the breather fitted, you will have much reduced oil consumption, and clean intercooler/boost pipes.
Also, when u run to atmosphere, u may find the idle is a touch rich. This is because the engine was previously using the air in the crankcase, which is now totally isolated.
Rick.
You need to disconnect the original breather from the metering head, and block the metering head off.
If the breather has a small port for connection to the inlet manifold vacume - block it off - don't connect it to the inlet.
The reason they have them, is by law u are not supposed to vent fumes to atmosphere, but it's bad for the engine to feed them back to the inlet. You will find that with the breather fitted, you will have much reduced oil consumption, and clean intercooler/boost pipes.
Also, when u run to atmosphere, u may find the idle is a touch rich. This is because the engine was previously using the air in the crankcase, which is now totally isolated.
Rick.
01-08-2007, 12:02 AM
#9
15K+ Super Poster!!
Micky
No - not really. The proper name for the alloy breather is an oil seperator. It does 2 main things.
No1 - The standard breather system releives pressure from the crankcase by sending it to the inlet- it only releives pressure from one port on the rocker cover. Oil vapour gets sucked into the intake system, which means oily pipes, and poor oil consumption. The crankcase pressure doesn't drop enough, as the long path to the metering head inlet, and the fact you only have one outlet means there is just too much restirction. This is why u get dipsticks blowing out, and oil caps coming off.
By fitting an oil seperator, you now have both ports on the rocker cover venting the pressure. Also, instead of having to go to the inlet, the pressure is releived straight to atmosphere - much less restriction. This means no more blown oil caps, and no oily air being sucked in the engine (which causes detonation)
The second thing the seperator does is... seperate. The oil vapour comes in through the two middle ports, where it can swirl about and cool. The heavier oil goes to the bottom and drains back to the block, where as the pressurised air is forced upwards out through the top port, then to atmo. Oil consumption is much reduced, because any oil in the vapour simply drains back to the block, instead of being burnt by the engine. Note that this is why it is important to have the top port to atmos, and the bottom to block.
A no cost way to improve breathing is to simply put pipes from the rocker cover ports into an unsealed coke bottle etc, and block of the metering breather inlet. The oil isn't seperated, so you will start filling the bottle with oil - which you could then pour back in. But, the pressure is releived, and your engine won't be burning dirty oily air. A new engine with good ring seal, will breath very little - so it may take months to fill the bottle. Racers use this method all the time, empying the bottle after the race.
Rick.
No - not really. The proper name for the alloy breather is an oil seperator. It does 2 main things.
No1 - The standard breather system releives pressure from the crankcase by sending it to the inlet- it only releives pressure from one port on the rocker cover. Oil vapour gets sucked into the intake system, which means oily pipes, and poor oil consumption. The crankcase pressure doesn't drop enough, as the long path to the metering head inlet, and the fact you only have one outlet means there is just too much restirction. This is why u get dipsticks blowing out, and oil caps coming off.
By fitting an oil seperator, you now have both ports on the rocker cover venting the pressure. Also, instead of having to go to the inlet, the pressure is releived straight to atmosphere - much less restriction. This means no more blown oil caps, and no oily air being sucked in the engine (which causes detonation)
The second thing the seperator does is... seperate. The oil vapour comes in through the two middle ports, where it can swirl about and cool. The heavier oil goes to the bottom and drains back to the block, where as the pressurised air is forced upwards out through the top port, then to atmo. Oil consumption is much reduced, because any oil in the vapour simply drains back to the block, instead of being burnt by the engine. Note that this is why it is important to have the top port to atmos, and the bottom to block.
A no cost way to improve breathing is to simply put pipes from the rocker cover ports into an unsealed coke bottle etc, and block of the metering breather inlet. The oil isn't seperated, so you will start filling the bottle with oil - which you could then pour back in. But, the pressure is releived, and your engine won't be burning dirty oily air. A new engine with good ring seal, will breath very little - so it may take months to fill the bottle. Racers use this method all the time, empying the bottle after the race.
Rick.
01-08-2007, 12:33 AM
#10
Advanced PassionFord User
Thread Starter
Rick ,thanks for all you're reply's,I will plumb in my alloy oil seperator as you and sm advised.Great tech advise mate and well appreciated by me. 
All the best,Micky
All the best,Micky
01-08-2007, 10:07 AM
#11
Too many posts.. I need a life!!
Join Date: Jun 2004
Posts: 583
Likes: 0
Received 0 Likes
on
0 Posts
ive got a bailey oil seperator fitted but also got the std breather vavle setup, ( the oil pipe from this std ford breather vavle goes into the bailey oil seperator tank) why is it fitted like this ???
01-08-2007, 02:18 PM
#12
15K+ Super Poster!!
turbo
it's fitted like this because the bailey instructions will tell you that's how you do it. You aren't "supposed" to vent to atmo, for emissions reasons. It should work ok like this. How clean are your boost pipes/intercooler? If bad, you may want to plump it in as described above.
Micky - no problem mate
You on track at ND?
it's fitted like this because the bailey instructions will tell you that's how you do it. You aren't "supposed" to vent to atmo, for emissions reasons. It should work ok like this. How clean are your boost pipes/intercooler? If bad, you may want to plump it in as described above.
Micky - no problem mate
You on track at ND?
01-08-2007, 05:36 PM
#14
Advanced PassionFord User
Thread Starter
Rick,,I wont be anywhere near Nat Day,because its a total balls up for serious trackday people like myself.I'd want to be mad to trailor my car all the way from Ireland for half a trackday!!! 
Am doing both days at Croft,you'll have to sneek in!! All the best mate,Micky
Am doing both days at Croft,you'll have to sneek in!! All the best mate,Micky
01-08-2007, 07:07 PM
#15
Advanced PassionFord User
Join Date: Aug 2005
Location: dont know anymore!!!!
Posts: 1,761
Likes: 0
Received 0 Likes
on
0 Posts
fook is mine plumbed in wrong then its going to the metering head as baileys instructions, been like this for 4 years or will it work better just venting it to atmosphere
01-08-2007, 11:40 PM
#16
15K+ Super Poster!!
gaz s1
yes it will work better - again, check how clean your inlet system is. Only problem with venting to atmo, is if the engine is old and breathing heavily, it can smell.
yes it will work better - again, check how clean your inlet system is. Only problem with venting to atmo, is if the engine is old and breathing heavily, it can smell.
Thread
Thread Starter
Forum
Replies
Last Post
