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Thread: Modified air intake

  1. #1
    Join Date
    May 2010
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    Modified air intake

    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

  2. #2
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    That would suck


    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...

  3. #3
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    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

  4. #4
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    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

  5. #5
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    Quote Originally Posted by mtb_gary View Post
    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.

  6. #6
    Dan Guest
    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.

  7. #7
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    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.

  8. #8
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    FWIW: Using the cabin for the air supply underestimates the quantity of air sucked into the engine at operating revs... You'd need to leave the windows open so as not to be suffocated through loss of O2...
    MY99 RR P38 HSE 4.6 (Thor) gone (to Tasmania)
    2020 Subaru Impreza S ('SWMBO's Express' )
    2023 Ineos Grenadier Trialmaster (diesel)

  9. #9
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    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 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 , 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.

  10. #10
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    Quote Originally Posted by goingbush View Post
    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 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 , 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.

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