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Thread: K&N pod filter

  1. #1
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    K&N pod filter

    Has anyone removed the air filter housing and air filter and replaced it with a K&N pod filter on a 1988 RRC 3.9 litre? I am thinking of doing this to get a few horsepower. Its running LPG so the air flow meter isn’t involved in the fuel delivery, or the cars ECU.

    I have a set of extractors fitted with ported heads, matched intake manifold and 9.8:1 compression.

    Wondering if it's worth it or just leave it alone.

  2. #2
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    Leave it alone.
    There is almost no difference in performance in all the tests I have seen and K&Ns can dust engines although David Vizard says that on a petrol engine the inlet pulsations will ensure no dust gets through. And Vizard is pretty well the guru on most things petrol related. He also claims they are no good on diesels as there are no inlet pulsations.

    So it shouldn't do much damage eg dusting but will not do much good either. The pressure drop over a clean filter is very small and usually the design of the airbox is more important.
    Regards PhilipA

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    I have done some reading today about the trumpet on the inlet to the air cleaner housing. A bloke had his RRC on a dyno and with the trumpet removed gained around 5% power. Wondering if anyone has tried this?

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    And in the real world didn’t notice it I bet.

    WOT is not real world.

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    There's no benefit in pulling hot dirty air from the engine bay into an intake with a pod on the end.

    Use an airbox, duct it properly to a source of fresh cold outside air - i.e. a snorkel or forward facing duct in front of the radiator(s)

    pulling in air from the engine bay with a pod filter is not beneficial, only serves to increase intake temps and make the engine less efficient.
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  6. #6
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    I take it you have barrel type filter with the inlet "sound muffler" or trumpet at the front pulling air from behind the radiator panel.

    I had this on my 91 RRC and fitted a snorkle mainly because a mate had hit a BIG puddle at 80Kmh and hydrauliced his engine.

    The snorkle back then entered the side of the filter IE you had to cut a hole and a fibreglass blender met the snorkle hose which ran inside the bonnet to a hole in the plenum chamber panel.

    I tried several different setups including cutting off the trumpet and making up a fibreglass attachment which sucked through several holes I drilled in the radiator panel.

    If you could get one of those UK filters which have a filter body around the filter and then make up something to suck through holes in the radiator support you maybe could get some improvement , but it would only be very small.( and a bit dangerous from water entry)

    I checked the pressure drop in my snorkle and filter box and filter and it was AFAIR about 12 inches of water which is really small. FYI I also checked the boost effect of the snorkle forward facing entry at WOT at 80Kmh and it was 1.5 inches of water which is really a bee's dick.
    Regards PhilipA

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    Quote Originally Posted by Tombie View Post
    And in the real world didn’t notice it I bet.

    WOT is not real world.
    I would also expect a drop off in torque in the rev range that actually gets used.
    Cheers
    Slunnie


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  8. #8
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    Re pod filters, I've noticed on Highway Patrol that cops defect cars with them if the filter is not in a housing.

    Unsure why.
    Ron B.
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    Quote Originally Posted by Mercguy View Post
    There's no benefit in pulling hot dirty air from the engine bay into an intake with a pod on the end.

    Use an airbox, duct it properly to a source of fresh cold outside air - i.e. a snorkel or forward facing duct in front of the radiator(s)

    pulling in air from the engine bay with a pod filter is not beneficial, only serves to increase intake temps and make the engine less efficient.

    LPG likes the cold air , especially .
    PLR or peter r elsewhere
    BA KA MA RRC L322 TD6 R1200GS

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    Quote Originally Posted by p38arover View Post

    Unsure why.
    The cynic in me says, because they can.
    ​JayTee

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