I have all ways wanted to know why, when an rs turbo engine is running and you take the oil filler cap off it cuts the engine out i can not think why is happens

 

becuase the engine block and metering unit are 'all one' so taking the oil cap off allows un-metered air into the system, thus too much air to fuel ration, so it cuts out

 

as above

 

It's an issue if it doesn't do it!

 

Thats a point actually, ive heard people say that it doesnt happen, why would it not happen?

Does this also not have something to do with the crankcase breather? or am I barking totally up the wrong tree?

 

air pressure

 

The engine works off vacuum. . how else do you think the metering flap is sucked down

 

how long does it usually take to stall after the oil cap is taken off? mine takes a couple of seconds, really stutters before it dies though, is that right or ok?

 

anything upto about 10 seconds I reckon.

 

Mine dies straight away.

 

Mine dies straight away sometime, and sometime it will cough and splutter for a bit and then die.

 

Leprechauns underneath the flap???

The engine should die pretty much straight away.

 

well it dies quite quickly so im ok!

 

Exactly. . they dont exist


Mine dies straight away!

Bear in mind it wotn die if you have an uprated breather!

Which then proves my point about vacuum sucking the flap down wrong?

Feck knows

 

So we're back to the start now then?

 

not true

mine didn't - because i junked the wank std breather setup and vented to atmos rather than back to metering unit!
voila, no more stalling when taking cap off (+ other benefits of course!!)

 

ps. its nothing to do with an 'uprated breather' not causing it to stall, it all depends on how its plumbed!

 

I think when he said uprated breather he meant no connected back into the air box

 

Cheers lads

mine cuts out straight away as well

 

one of mine doesnt cut out, but does stutter lots!!!!!!!!!!!!!111
its idleing at 2000rpm at the moment (dont ask why, but is at mo)

would this affect it?

 

mine doesnt cut out and i have all standard breathers on mine

but i also have an oil leak at the rear crank seal, supposedly down to stuffed rings, could this possibly be due to some other problem then if my engine is not stalling when the cap is removed ?

 

If you have a leaking crank seal and on a standard breather i would expect your car to struggle to idle, not continue to run with the cap off. You may have blocked breathers, which could be building up pressure and making a worn seal leak, aswell as stopping it cutting out when the cap is taken off...........

 

DONT be picky

 

I was told that it means you've got strong internals

 

Who told you that

 

One of my mates was telling me few yrs back and am sure i remember reading something similar to it before

Guess they were both wrong

 

Dan,Lookslike it

ballin, I did mean not vented back to the metering unit, I thought by putting a catch tank in, you didnt connect it to the metering unit.

safechav, thankyou, i did mean that

 

Strange

As said above the reason i know if it stalling, is because when the cap is removed that big hard plastic pipe that runs from the emission control filter to the air box allows a big air leak to enter the system after the flap which stops fuelling to the engine.

I did have an RS i got proper skanked on, that was standard, but that ran without the cap on (also blew the cap off the first time cos i went for a test run without the bonnet on and saw it fly off PMSL )

That car was fucked though, if i ragged it down the road you could follow the white trail of smoke to find me