Breather kit into cam cover or not? *all fitted now*
#1
Football Cwazy
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Breather kit into cam cover or not? *all fitted now*
i'm gonna fit a bailey breather kit to the saff this week as part of it's slow rise from stage 0.5 to stage 3 , was wondering if people have their kit's connected to the top of the cam cover or not and what the pro's and cons are .
my local cossie expert fits them to the cam cover but i suspect this is cos he worked on the old rs500 touring cars and it's what suited them.
opinions please people
my local cossie expert fits them to the cam cover but i suspect this is cos he worked on the old rs500 touring cars and it's what suited them.
opinions please people
#3
Weird one this, you seem massive power engines both with and without it, seems to work either way.
I guess when it comes to breathing it doesnt matter as much where the holes actually are so long as they are big enough and there is enough of them.
Most modern engines have cam cover breathers though and ive heard of a few engines have problems without them in terms of blowing the camshaft end seals, not seen it on a YB personally though.
Id say have it, as i cant see a downside to it personally.
I guess when it comes to breathing it doesnt matter as much where the holes actually are so long as they are big enough and there is enough of them.
Most modern engines have cam cover breathers though and ive heard of a few engines have problems without them in terms of blowing the camshaft end seals, not seen it on a YB personally though.
Id say have it, as i cant see a downside to it personally.
#4
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Ive heard people say ''Oil will come out'' Ive seen lots with the breathers on there so cant see it causing problems and the bailey kit comes with an alloy spigot to fit onto the rocker cover anyway
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chip i seem to remember mike saying there was a downside to cam cover breathers, something to do with oil flow. maybe this was on high HP engines.
cant 100% remember.
But as you say there's high HP engine with both, so i guess its down to preference
cant 100% remember.
But as you say there's high HP engine with both, so i guess its down to preference
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#10
Team HOTHOT!
Originally Posted by chip-3door
Oil will come out, along with pressurised air, thats fine though providing you seperate it and dump the oil back into the sump so you arent losing it.
i need to return mine to the sump
#12
Originally Posted by dingy
BTW its a crank breather and has nothing to do with the head LOL....
Mine has it and uses no oil on full chat....
Mine has it and uses no oil on full chat....
Explain what you mean mate, cause im lost by that!
#14
Originally Posted by dingy
Where is it breathing from then chip ?
From the cam cover on the top of the head, although obvioulsy all the pressure is linked back to the crankcase via the oil galleries.
Think posisbly we are (inadvertently) playing with semantics here?
Ie you are saying that because the head (cam cover) gets pressurised by the pressure from the crank case that its crank case pressure you are breathing?
If so, i agree completely its all pressure originating from the crankcase and thats what you want rid of (from more or less wherever you can lose it IMHO).
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I think you will find chipster that the breather hole at back of cossie engine is a direct tube inside engine to the crank.So even though the cam cover is drilled it is actually breathing from the crankcase. And Obviously from the valve guides as well
Circled in pic below.
Circled in pic below.
#17
Originally Posted by 3drstretch
I think you will find chipster that the breather hole at back of cossie engine is a direct tube inside engine to the crank.So even though the cam cover is drilled it is actually breathing from the crankcase.
Not on ones ive seen done anyway, its just tapped into the cam cover itself.
#24
Originally Posted by dingy
LOL @ Guides - sealed by the rocker cover gasket and the head gasket - how does this work then stu ?
He means that combustion chamber pressure makes it into the head past the valve guides (especially when your valves themselves arent sealing due to being not lapped in but even before that as valves are opened at points in the cyle there is pressure in the chamber).
This then pressurises the cam case, which in turn (via the oil feeds to it from the crank) adds to the crank case pressure issue.
#26
Originally Posted by dingy
I get that dude - but what has this got to do with the breather in the cam cover LOL....
Because its all linked via the oilways into the head?
Although i think Stu was just mainly pointing out what a clever cunt he is who looks at the whole picture more than the rest of us
#27
Steve, please dont suggest the oil gets to the valvetrain "all on its own" and doesnt even have a drain back to the sump...
Take a look at the head where that cover port joins up to and see what happens to it below cam cover sealing face please and you will then understand what it has to do with your topic.
As for it doesnt work... 1700 miles, hundreds of ŁŁ of fuel, 21 laps of the nurburgring mnany hours of 100mph + rushing through germany and belgium to make the tunnel in time... result =
0.25litres of oil used to top up from 3/4 full back to full on the Sunday afternoon after allready doing 17 laps as MANY people will confirm , as people appeared to be surprised that it was ALWAYS completely full...
So, it seems to work ok for me, but that said, with more rpm you do run into different problems with sheer volume of oil thrown around, especially in the valve train area... but thats another story.
Take a look at the head where that cover port joins up to and see what happens to it below cam cover sealing face please and you will then understand what it has to do with your topic.
As for it doesnt work... 1700 miles, hundreds of ŁŁ of fuel, 21 laps of the nurburgring mnany hours of 100mph + rushing through germany and belgium to make the tunnel in time... result =
0.25litres of oil used to top up from 3/4 full back to full on the Sunday afternoon after allready doing 17 laps as MANY people will confirm , as people appeared to be surprised that it was ALWAYS completely full...
So, it seems to work ok for me, but that said, with more rpm you do run into different problems with sheer volume of oil thrown around, especially in the valve train area... but thats another story.
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if breathing from the cam cover is so crap..
why did the touring car rs500's do it????
as can be seen in one of the millions of photos by martinlabattstouringcarrs500 blah blah
stretch... a slap.. thats what.. a nice dry one!
why did the touring car rs500's do it????
as can be seen in one of the millions of photos by martinlabattstouringcarrs500 blah blah
stretch... a slap.. thats what.. a nice dry one!
#32
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dave escos the touring car engines did not actually breath off the rocker cover in that sense ,the head was modified by the instalation of a stack tube making the oil return in the head a gas transfer port ,the rear of the head was modified and a seprate external pipe returned oil back to the sump above oil level.
Hope this helps
Hope this helps
#35
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keep going guys more opinions and views, and maybe arguments
so in the bailey kit i will have the fittings to have a port off the cam cover?
where will the pipes go if this isn't used? forgive my ignorance but haven't even looked at the cossie breather system so i know naff all about it.
thanks
so in the bailey kit i will have the fittings to have a port off the cam cover?
where will the pipes go if this isn't used? forgive my ignorance but haven't even looked at the cossie breather system so i know naff all about it.
thanks
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here you go mate
probably the least messy of installs (i mean messy as cutting and drilling holes in expensive stuff ... )
https://passionford.com/forum/viewtopic.php?t=103270
probably the least messy of installs (i mean messy as cutting and drilling holes in expensive stuff ... )
https://passionford.com/forum/viewtopic.php?t=103270
#39
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thanks mate that helps, but still a bit unsure about a return to sump? mines 2wd
guess i'll have to just get stuck in,normally works
#40
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Well mine breaths from the cam cover,
does a nice job along with my 2nd hand Cometic head gasket
and slapped together in my garage engine...
2years 10k miles and still counting
does a nice job along with my 2nd hand Cometic head gasket
and slapped together in my garage engine...
2years 10k miles and still counting