Hey guys,

Looking at the car today I noticed something strange. The air to the filter takes a long and odd shaped route to the filter. Can anyone explain why there is not a cut off near the breather hole closest to the filter (which is for what?!) so that the air can get into the engine a lot faster

Heres a picture so you can see. Air goes in that tiny square top left and is funneled in that long windy pipe (arrows show the route the air has to go before reaching filter) with breathing holes(shouldn't it be closed for more pressure?) Too much turbo reading makes me think this :D Ignore my rambling..

Anyone know what the RS/ST versions look like? only possible to see without grille or looking in the grille directly

Which type of engine is this ?

I'm guessing the crankcase breather and that's a 1.6tdci

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Which type of engine is this ?

Its a 1.6 zetec petrol 2009

that looks exactly the same as my 1.6 tdci...

I pulled the snorkel off, didn't make the blindest bit of difference cept a spot more noise

that looks exactly the same as my 1.6 tdci...

I pulled the snorkel off, didn't make the blindest bit of difference cept a spot more noise

I think cutting it accordingly would be better than removing the whole thing as it needs to be funneled a bit. if it was just a gaping whole results may not be as good. Again this is where AIR goes in so diesels should look the same right?

Seems someone beat me to it:

http://www.focusfanatics.com/forum/duratec-ti-vct-performance-2012-current/297795-snorkel-delete.html

http://www.focusst.org/forum/focus-st-performance/8848-air-box-snorkel.html

I don't mean to be cheeky or anything but that's a turbocharged 1.6 tdci

the silver casing is the heastshield for the turbo and dpf, the large metal pipe coming from left to right heads down to the intercooler. the one on the left is the return pipe.

yeah I read those before but I ran some numbers and it made no difference at all having it attached so I decided that having it on was a waste

I don't mean to be cheeky or anything but that's a turbocharged 1.6 tdci

the silver casing is the heastshield for the turbo and dpf, the large metal pipe coming from left to right heads down to the intercooler. the one on the left is the return pipe.

yeah I read those before but I ran some numbers and it made no difference at all having it attached so I decided that having it on was a waste

Haha I see what you mean I know the one in the picture is a tdci! It's not car but I used it as its the only image I could find to show the snorkel bit which is the same on my petrol hence my specification given. Didn't think the background would matter

Still it seems strange that its a very un-aerodynamic route at all to filter. I guess they're trying to keep it stock :D

Ah, well that explains that then, I was beginning to wonder if you would have noticed a couple of issues shoving petrol in to her!

well I took mine off and it makde no difference to anything that I can record so either the effect is so small we cant see it or the design team were drunk, which is distinctly likely given the other questionable design decisions around this car

Good luck shoving petrol in with easyfuel... :P

That is really odd though, usually intakes are designed with a ramair effect but that setup looks pretty small, I've never seen these with a grill off before!

It shouldn't really matter on a charged engine due to boost but on an NA using vacuum you do want a nice long intake tract for that. I personally wouldn't chop it about without finding out exactly why it was designed like that first, not sure where you could find that info unless you know some Ford designers lol.

Ha, you know the sad part it, you can bet your 'bottom' that some poor sod has managed to get a petrol pump in to it before, theres a lot of daft folk out there!

as for air, that was my thought, the turbo will suck air in via the path of least resistance, it wont give a monkeys if its smooth airflow or not, at least on that side of the system, as long as its unrestricted its happy sucking up as much as it can get, after the turbine tho you would expect a lot of detail goes in to the flow of air, it will behave an awful lot like water heading up to the inlet manifold which will be why petrol's need a bit more attention

Its probably just a left over from the petrol design

I must admit, I'm tempted to try a petrol pump in there haha. :D

Even after the impellor it doesn't matter much about the airflow as long as the pipe size doesn't reduce, look at any mass produced turbo manifold compared to non-turbo, turbo mani's are (mostly) just small square/blocky where NA manis are long and smooth and usually bent to make them as long as possible.

I was thinking about this while driving earlier though...I was wondering if it's maybe to stop water going directly through to the filter? Any idea if there are drain holes at the bottom of the 'V' under the lock?

Ha, you know the sad part it, you can bet your 'bottom' that some poor sod has managed to get a petrol pump in to it before, theres a lot of daft folk out there!

as for air, that was my thought, the turbo will suck air in via the path of least resistance, it wont give a monkeys if its smooth airflow or not, at least on that side of the system, as long as its unrestricted its happy sucking up as much as it can get, after the turbine tho you would expect a lot of detail goes in to the flow of air, it will behave an awful lot like water heading up to the inlet manifold which will be why petrol's need a bit more attention

Its probably just a left over from the petrol design

So I wonder why the petrol was designed like that as it still seems inefficiency? I mean I know were supposed to trust that the ford engineers know what they're doing and I know I don't know more than them :D

I must admit, I'm tempted to try a petrol pump in there haha. :D

Even after the impellor it doesn't matter much about the airflow as long as the pipe size doesn't reduce, look at any mass produced turbo manifold compared to non-turbo, turbo mani's are (mostly) just small square/blocky where NA manis are long and smooth and usually bent to make them as long as possible.

I was thinking about this while driving earlier though...I was wondering if it's maybe to stop water going directly through to the filter? Any idea if there are drain holes at the bottom of the 'V' under the lock?

mines in my big box of car bits so ill get it out and have a look tomorrow, with that v bend under the bonnet lock it must drain somewhere or it would block it up although in saying that, its pretty well shielded from the weather under that panel

So I wonder why the petrol was designed like that as it still seems inefficiency? I mean I know were supposed to trust that the ford engineers know what they're doing and I know I don't know more than them :D

As Tom was saying, with a NA engine the airflow is vey important, it needs to remain smooth without vortices, by channelling the air along a long smooth curve it will smooth it out more

mines in my big box of car bits so ill get it out and have a look tomorrow, with that v bend under the bonnet lock it must drain somewhere or it would block it up although in saying that, its pretty well shielded from the weather under that panelAs Tom was saying, with a NA engine the airflow is vey important, it needs to remain smooth without vortices, by channelling the air along a long smooth curve it will smooth it out more

Any idea where I can readup more on this? Wouldn't know what to search. Still seems strange that it would need to be smooth to enter the air filter BOX before its sucked into the filter then into the throttlebody. I'd understand a smooth flow filter to throttle body just not into the filter box

Is it something as simple as getting a "cold" air supply to the engine? (Compared to engine bay air, which will be warmer?)