Basically, yes. It can be a bit awkward and helps if you take the vent off too and pull it through when you can see it.

 

Thanks CJJ

I think it is better to do it from below?

 

When you do it, just make sure the rubber seal connecting the pipe to the airbox is pushed in all the way. Mine came undone with too much wiggling. (Big sigh - the story of my life).

 

Too much wiggling or too much pulling?

 

I didn't mention pulling. Definitely too much wiggling.

 

If one's comes "undone" it's normally through to much pulling, if it falls off it's definitely through far to much pulling and one should stop straight away and just wiggle it!

 

First thing I'd do, if I were you, would be to check that the intake hose above the passenger rear wheel arch (which is the one you want to redirect of course) has not rotted out.

Mine had. The underside of the hose is right above the inside of the wheelarch and there is no plastic arch-liner for the rear arches. Spray from the road had eaten out most of the underside of my hose when I had a look.

I didn't buy a new hose, I just tidied up all the raggedy bits of nylon filament and stuff and put two layers of duct tape over the metal reinforcing wire (whilst holding the hose fully extended - this allows the tape to form a sort of flexible concertina shape when you relax it and so it can be flexed easily.

My reasoning was that duct tape is apparently indestructible as far as I can see so it ought to do a better job than the original hose covering ;0)

 

Nice hint!
Duct tape, probably is sensible to heat and has glue in the inside that can stick dirt?

Perhaps it is worth to fit a better hose for start?

 

I'm not recommending duct tape, but it seems to still be working for me 1 year on. I was not expecting to find the hose had rotted when I took the wheel off and wanted a fix before the wheel went back on. Lazy, but there you go...

Best solution is a new hose of course.

 

i would question why you want to put the air intake next to the side vents...?

the air flows out of the side vents when the vehicle is at speed.. the same function as a chimney.. the wind blowing across the top of the chimney draws air out.. not in.

you can do such an experiment yourself... take a tube that you can blow across the top of.. light a ciggy or a jostick... let the smoke drift past the other end of the tube that you blow across.. the smoke will be drawn in.. not pushed away..

so.. you create a negative flow at the air intake...?

the faster you go.. the more the effect...

why would you do that?

 

why would you do that?

MMM, the general consensus seems that you take more cold air.

 

cold wet dirty air -on a wet road... from debris coming off the front wheels, one cant change the composition of the air.. only the pressure - quantity not quality. http://www.mgf.ultimatemg.com/group2/aerodynamics/side_air_intake.htm

i know though that you have a modified car DD,

I cant find an excellent pic now, of the mira wind tunnel mgf air flow..

the mg consensus was that the best place for the air intake was cold still air... in effect, where they put it, near the rear bumper.. where the pressure remains constant, is not subject to road debris and water.. and temperature changes are more gradual.

i think we have discussed this before, but i cant find the posts ive made yet,,

if you put the air intake beside a modified side vent.. its going to be subject to rapid temperature and pressure changes.. and anything else that gets forced into a modified vent.. the unmodified vent actually does what ive said.. air is drawn out... it needs the engine bay fan to actually push air into the engine bay. and force it out of the boot vents...

the shape of the vent is critical , the size of the air pipe changes the flow rate in it... the cylinders can only ever draw in as much air as the ecu lets them.. unless its compressed in.. then the ecu needs to know at all times what that mixture is... to burn it properly..

http://www.explainthatstuff.com/aerodynamics.html

the idea that air flowing past the rear wing is in somehow containing more oxygen, than the still or less turbulent air say.. inside the wing is false... its the same air..

 

I see, it make sense.

This can explain why some cold induction filter report lower performances?

 

The TF’s induction system is about as optimised for the engine in standard tune, some of the cold air induction systems could well just be rubbish in comparison.

It’s an interesting thought that it’s better to have relatively still air from a warm engine by then have cooler but more turbulent air from outside the of the car. Perhaps that’s why MG elected to put the pipe were they put it.

 

My understanding is that with high speed, air flowing on side will be much thinner than in the engine bay, creating a vacuum effect (exactly like the wing of a plane).

Below the car, since the bottom is flat, the air will be much slower (denser), and will not create a depression, sucking air away.

Yes, now that I think of it, probably this is way induction pointed to the side went are less performant: probably nothing to do with the filter, just where the duct is.

It would be interesting to try and put the air duct pointing forward, instead of sideway, but still in the engine bay.

 

Are we getting confused between pressure and density here?

According to a basic theory of physics called Bernoulli's law, fast-moving air is at lower pressure than slow-moving air, so the pressure above the wing is lower than the pressure below, creating the lift that holds the plane up. Although this explanation of how wings work is widely repeated, it's not the whole story.

 

I'm not an engineer, but to my poor knowledge a fast-moving fluid is less dense, weight less and leave empty space, that other denser gasses (from the engine bay?) try to fill, removing air from the inside the bay?

I understand that my simply explanation of the wing could be missing, but I'm eager to get the details from those who knows more than me.

 

What happens to the air in the engine bay would require either testing or simulation, as the shape of the car in that area is too complex to just wet a finger and figure out whether air flows in or out of the vents. Sure, air is going past the vents along the sides, but air is also speeding under the engine compartment. If the air under the car was static, yes I think air would probably flow out of the vents, the wrong way, but the air under the car isn't static.

Plus, these aren't simple smooth holes. That will affect things too.

The only one way to settle this is... ;0)

By the way, Bernoulli is always trotted out with this kind of stuff, with people saying air flowing over a curved surface (like the top of a wing) has to flow faster to keep from piling up air in front, and faster flowing air has lower pressure hence the wing experiences lift. Well, wings with mirror image curved top and bottom surfaces generate lift too, as do flat plate wings, so clearly Bernoulli needs a bit more explanation. The best way to look at it in my view is that if air is deflected through an angle (wings have an angle of attack) , it has had its momentum changed (momentum = mass*velocity - and remember velocity has a defined direction, so if the direction of the air is changed, the momentum has been changed so a force is generated as force = change in momentum.

Any time you change the direction of air, you generate a force.

Then there's the Coanda effect, but I feel that's enough for now ;0)