knock out or drill out the bit highlighted to accept an oil breather???
If so whats the best way to do it?

cheers

 

thats what u are meant to do (drill it anyway u will not knock it out lol) i did it at work with a hole cutter in the pillar drill as a drill bit that size is very expensive to use once

 

ok so i could use a hole saw from back and it will be guided by the tube all ready there? makes sense

 

yeah just go easy and take your time should be ok as hole cutters come with a piliot drill in them just measure the breather hose adapter with a mic and get the same size cutter

 

stepped drill bit would be best

 

not really how will that fit inside the guid tube on the inside on the rocker cover and if he dose it from the other side how is he going to know were the middle is! a hole cuter or the right size drill bit will be best lol but as i said a drill bit that big is expensive for one use

 

i was actually thinking of a pilot hole from underside then stepper from the top; but the top is slopped, so my bad

for me

 

ha ha no worrys mate

 

wouldnt bother breathing from there no need to

 

it will suck all the oil out the head from there if you rev to high, thats what kept happening to me anyhow

 

As said expensive if only doing one to buyt a suitable reduced shank bit.
Would only cost a few quid to get done at a engineering place, as they wil have this size or similar bits.
I use bits larger than this in the lathe, but these are 13 shakes reduced so would fit in a ordinary drill, I use blacksmiths drill bits up to 55mm.
If doing yourself just drill pilot dead centre(as best you can) then gradually open with sucessive larger drill bits to the max size you have ie 10mm or 13mm normally, then use rotary file or rasp to do last bit.
tabetha

 

what lol hows it going to do that then it just lets the top end breath a bit better and if its not needed why do all the top cars have it?

 

dont ask me i had a spec r breather and it filled the catch tank up and i was low on oil

it sucks the oil out from somewhere, once it was blocked off it was fine

 

thats called breathing heavy

 

was the spec R kit installed correctly in the first place?! most breather kits you get told to the cam cover, and wasnt that hole actually put there so it could be tapped at a later date for breather kits?! end of the day its a breather hole already in the block going to the cam cover from factory?!

 

alls i know its a bad idea to breath frm there was told this years ago, i wont be breathing from there ever again, and my car wasntbreathing heavily either i just know all the oil went from engine into that container and it was installed properly

ill be using a wrc one next or a ggr

 

this is from the graham good website

 

well 90% of cossies out there do so dose rod tarrys and if he has it there carnt be much wronge with it with over 800bhp i have it on mine and its fine in my opion if u were pumpimg the oil out the breater into the catch tank then there is something wronge mate or u never fitted it right its an indercation u were breating heavey as i said and by the way they still breath from the crank case aswell lol

 

yeah crank case is fine, but why when i had it in the head when i over revved it sucked the oil out and spat it in the catch tank, but when i blocked it off it didnt do it even after being over revved

you carnt install the thing wrong anyhow 1 under turbo, 1 to kidney box one cam cover into breather seperator and catch tank, ive always ran them on my cossies, but all did the same even on fresh engines after running

 

i really carnt awser that mate all i know is i have it and ive never filled my catch tank up been on there about 5 years now

 

i supose it all depends on how yu drive the car aswell

 

u can install them wrong at the breather.

 

was installed as the instructions said and you carnt as the pipes will only go one way on that side of breather

 

Dont bother putting it there..

breather from either side of block to catch can, return to sump so your canister doesnt fill up with all your oil, and one from top of breather to atmosphere...


oh but wait, all the top cars have it on the cam cover, so it must be right !!??

 

oh but wait, all the top cars have it on the cam cover, so it must be right !!??[/quote]do it as u wish mate all im saying is there is no wronge in doing it the way the guy asked after all mate dident cosworth them selfs make it this way for when they raced! or was it an error till people like u came along and put it right!

 

do it as u wish mate all im saying is there is no error in doing it as the guy asked this is how cosworth them selfs made it for when they raced! or was that a mistake for people like u to put right!

 

my breather is in top on the cam cover been like that for 4yrs and never had any trouble

 

mines also from their too and has been for ages never had any problems...

 

calm down boys and girls do what you want with ya own cars just wanted to know what best way to open the oil breather hole was

 

If the bottome end is breathing adequatly then there will be little pressure running through this anyway, to actually have oil blown up this pipe the level would need to cover the depth of the head to the pipe attachement imo.
As a rule you can't have enough breathing, just a pity the evacusump system is not popular here.
tabetha

 

or u have too much crank case pressure because of piston ring blow by and its pushing the oil out the engine into the catch tank!

 

what top cars have it ?

we dont use it on any of our engines

unless the customer has it in there and dosnt want to change cam cover

the best place to breath is both sides of the block

jim

 

im not saying its the way u should do it im just saying its how most people do it and its what cosworth intended after all they raced with it like that mate! also most of the top cars on the scene have it like that i only said that as the other guys were saying its best not to do it this way
each to there own there is no right or wronge way

 

tbh i think its just a old thing on the rs500 touring cars, ist not needed
the way i said is perfectly addequate for any spec of engine possible

the wrc/grpa rally cars didnt use it..

but like you say, its up to the fella if he wants to, so be it