Modified air intake

[mtb_gary]

It's just a thought at this stage, but I have been toying with the idea of having an alternative air souce for the engine to collect the air from inside the cabin rather than put a snorkel on the outside of the car as I prefer to keep the external aeshetics of the car close to original.
The idea is to have a "Y" junction inside the guard that has a 2 way flap that is controlled from inside the car. In most operations the air is sourced from under the guard as per normal, however for wading the flap can be closed and the new pipe work that enters the cabin around the glove box area can be activated. Yes, this will suck air out of the cabin but opening the sun roof or a window or 2 would allow fresh dry air to enter the cabin.

It's just a thought, and up for comment.

Gary

[onesilop]

That would suck :p


Wouldn't it get Awfully noisy? I find that I can hear the air being sucked into the snorkle when I have the window down so I cant imagine what it would be like if you piped it into the cabin...

[Wallyb]

I like the concept. I dont like the idea of a 3inch hole in the firewall.

I have been thinking about a snorkel myself the last few weeks. So I will have to give this idea some thought.

Realistically - water crossings have always been a minor point for me - dust is a more important issue that a snorkel deals with.

I was thinking along the lines of a removabable snorkel. Put a removable cap on the bonnet or guard. Take it off and pop in a length of pipe when required.

Another thread on snorkels discussed the option of moving the air box and EAS around...

This could be an interesting thread :)

[mtb_gary]

I think I would prefer the sound of the air intake to the sound of the motor seizing due to the ingress of water. It will only be noisy during the wading, then it's back to outside air once again.
Gary

[p38oncoils]

I think I would prefer the sound of the air intake to the sound of the motor seizing due to the ingress of water. It will only be noisy during the wading, then it's back to outside air once again.
Gary

The idea is sound but taking the tubing through the firewall might get a bit messy. Another option along the same lines would be to connect the air box intake to the cab air intake plenum below the windscreen. That would suffice for most sensible water crossings.

[Dan]

Not sure if you travel on dusty tracks, Gary, but snorkels are handy for reducing dust intake and can have socks inserted for extreme dust or insect conditions.

[redandy3575]

I've toyed with the idea myself in running a pipe further up the guard or getting a flexible snorkel to run around the back of the engine, but all roads led back to the humbled snorkel. It's not worth the risk doing it half porkie.

[Hoges]

FWIW: Using the cabin for the air supply underestimates the quantity of air sucked into the engine at operating revs... :eek: You'd need to leave the windows open so as not to be suffocated through loss of O2...

[goingbush]

How big is a rangie interior, the cargo volume is 71 cubic feet for a Sport, but the entire interior ? just for interest sake lets say 5' x 5' x 10' = 250 cubic feet.

Your typical 4x4 engine will be breathing at least about 250 cubic feet per minuite, a P38 probably more.

I'd say in the first 10 seconds your ears are going to pop :eek: then all the dust sitting around all the orifices is going to get sucked in, (and yours will be sucked out) at about 30 seconds your eyes are going to pop out :eek2: , then your going to suffocate, then if the engine keeps running a vacuum will be created and no one will be able to hear you scream, as we know sound does not travel in a vacuum.

Also the bungs in the floor will get sucked up and water will come in anyway.

Apart from that not a bad idea.

[Pete38]

How big is a rangie interior, the cargo volume is 71 cubic feet for a Sport, but the entire interior ? just for interest sake lets say 5' x 5' x 10' = 250 cubic feet.

Your typical 4x4 engine will be breathing at least about 250 cubic feet per minuite, a P38 probably more.

I'd say in the first 10 seconds your ears are going to pop :eek: then all the dust sitting around all the orifices is going to get sucked in, (and yours will be sucked out) at about 30 seconds your eyes are going to pop out :eek2: , then your going to suffocate, then if the engine keeps running a vacuum will be created and no one will be able to hear you scream, as we know sound does not travel in a vacuum.

Also the bungs in the floor will get sucked up and water will come in anyway.

Apart from that not a bad idea.

Ha ha. Well said. I vaguely remember some flaps in the back hatch that seemed to work to eliminate negative pressure in the cabin. I noticed them when I put a reversing camera in there but can't remember exactly where or which way the swung. Or where they facing the other way to stop positive pressure when you have the air conditioning venting from outside?

I'm thinking they went outwards to stop positive pressure in the cabin but putting it out there cause I can't look at the car right now.

[stopover]

pbrown. If you get a lot of dust then you should take off the four (6?) or so philips screws and examine the foam filters in the flap box over the inside of the rear window. We don't get much dust in the Isle of Man but mine were blocked solid. You can wash them (carefully). A 2000 4.6 Holland and Holland.

ps what about taking the schnorkel through the pollen filter housing? OK in a hot country but in the Isle of Man, in the winter, I would like the heater to warm me not the engine.

[Hoges]

Goingbush is on the money! There was an engineering study done using (IIRC) and Audi quattro. The developers placed pitot pressure sensors at various positions on the front of the car to record pressure buildup to determine aerodynamic drag.

At high revs in intermediate gears, there was virtually no pressure! All available air was being consumed by the engine air intakes which were placed each side of the front grill... :twisted:

[benji]

I've often thought of piping the air in from the cabin - who cares about the noise, and if you opened the sun roof all the way there'd be no cabin vacum. I had plans to do this on my classic, and cut the hole in the passenger side pedal box.

There is room on the p38's to join a pipe to the front of the airbox, and run it next to the eas stuff, over the top of the shock mount. Would be easy to block off with large plastic ball valves operated by a choke cable setup.

Could it possible be plumbed in to where the steering column is on the LHD models? - lazy of me I know - but cars in the shed and it's dark and scarry in there.

I don't know wether it'd pop your eyes out, as the cross section for the pollen filters in larger than the intake diameter of the motor - but it sure wouldn't be comfortable. I certainly wouldn't want anyone with bowel problems in the car....