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Thread: Air Horn Filters

  1. #1
    Registered User grannyknot's Avatar
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    Default Air Horn Filters

    I just lucked into a deal on these air horns,Click image for larger version. 

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    45mm choke, 57mm tall and 87mm wide at the lip. Big lip, I spent a few hours today hunting through sites that sell air filters for air stacks and haven't found anything.
    Wondering if the Z collective (love that term, kinda like the borg collective) has any suggestions, foam socks or stainless steel mesh caps?
    Worse case, I could have a few mm cut off the lip so a standard filter would fit but would rather not do that if I don't have to.
    Thanks,
    Chris
    Last edited by grannyknot; 11-09-2013 at 05:25 PM.
    1970 240Z HLS30 01955 March/70

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    Nova Scotia,Canada,Earth Blue's Avatar
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    Some foam and glue and a craft mood will get you these:



    btw how do those 45mm horns mate to the SK's opening. Is there a step?
    There is scarcely anything in the world that some man cannot make a little worse, and sell a little more cheaply.
    The person who buys on price alone is this man's lawful prey.


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    Registered User grannyknot's Avatar
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    I would have to find the same kind of foam they use for air filters so that sticky oil would work properly, a good option.

    There is about a 1mm lip on the barrel sleeve that needs to come off, a couple of seconds with the dremel and some emery paper and almost a perfect match.
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    Blue likes this.
    1970 240Z HLS30 01955 March/70

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    Rust Free'ish zKars's Avatar
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    The air horn filter thing has been discussed recently on hybridz.

    Weber Velocity Stacks Filters or No? - Nissan L6 Forum - HybridZ

    Given what the advantages of using air horns do and how that works, ie the improvements in air pattern and flow at the lip of the horn, it seem intuitive to me that using those mesh filters that slip over that critical lip shape can do nothing but remove most if not all of the advantaged gained. Let alone the poor filtering they provide. Do they look cool? Yup.
    -----------------------------------------
    Jim
    73 240Z HLS30 149331
    69 510 PL510 77603

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  5. #5
    Registered User grannyknot's Avatar
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    Jim, good thread there on Hybridz, it's got me leaning away from screens.
    Found theses, Clamp-On | Uni Filter might be a little tight.
    and, https://www.pegasusautoracing.com/pr...asp?RecID=8877 or this and make up my own as Blue suggested.
    1970 240Z HLS30 01955 March/70

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    Have you thought about these - I only take 1 real road trip per year to Tail of the Dragon:
    ITG Air Filters - performance air filters for road and race vehicles
    Last edited by Travel'n Man; 11-10-2013 at 04:21 PM.
    Life's a journey; enjoy the ride!

    Mitchell
    L28 - N42 Block w/Flat tops - N42 Rebello Head & Cam - Triple 40 PHH Mikuni's - Headers - Recaro Seats -
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    1972 Datsun 240z
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    Rust Free'ish zKars's Avatar
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    Granny, check out the weber air specific filter that UNI has on the automotive page! Maybe these dont screw with the air patterns into the horn as much

    Automotive | Uni Filter

    I hope they mean $32 per pair, but I'm afraid not.
    -----------------------------------------
    Jim
    73 240Z HLS30 149331
    69 510 PL510 77603

    www.zKars.com
    www.calgaryzclub.ca
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  8. #8
    Registered User grannyknot's Avatar
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    Jim, I thought those would work too until I saw the 3.25" is the O.D., there made for 2" wide stacks.

    Micthell, I forgot about ITG, they have some very nice stuff. I have sent an inquiry about their JCS 12.
    Thanks,
    Chris
    1970 240Z HLS30 01955 March/70

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    Registered User Travel'n Man's Avatar
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    Chris
    This may be the best route to take - I'm thinking seriously about one. I really like my horns showing, and the air flow around them but the micro dust is not very healthy for my engine.

    Air Boxes
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    Mitchell
    L28 - N42 Block w/Flat tops - N42 Rebello Head & Cam - Triple 40 PHH Mikuni's - Headers - Recaro Seats -
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    1972 Datsun 240z
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    Registered User Travel'n Man's Avatar
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    Here is one with a cheaper price - interesting ducting on the pic as well:

    Datsun Z Triple Weber Conversions and F.I. Conversions
    Last edited by Travel'n Man; 11-11-2013 at 08:05 PM.
    Life's a journey; enjoy the ride!

    Mitchell
    L28 - N42 Block w/Flat tops - N42 Rebello Head & Cam - Triple 40 PHH Mikuni's - Headers - Recaro Seats -
    R180 3.9 Diff - Close Ratio 5 Speed - Toyota Vented Brake Upgrade w/ Porterfield High Performance Pads & Shoes

    1972 Datsun 240z
    HLS30-75040


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    Yeah, I have been looking at those for a while, this is the CAI box I would really like to get,
    Click image for larger version. 

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    As far as I can tell these air boxes were made in Japan for their market and NA never got them.
    Very slick looking. But in any case I would have to cut down my present air horns so they would fit so I think I'll try and build one out of filter foam first and see how that works before I spent the big money.
    Thanks,
    Chris
    1970 240Z HLS30 01955 March/70

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    Registered User grannyknot's Avatar
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    1970 240Z HLS30 01955 March/70

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    There is scarcely anything in the world that some man cannot make a little worse, and sell a little more cheaply.
    The person who buys on price alone is this man's lawful prey.


    John Ruskin (1819 - 1900)



    ZCars in Eastern Canada seaport ready for shipment to Europe

    http://ZSportCanada.com


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    There is scarcely anything in the world that some man cannot make a little worse, and sell a little more cheaply.
    The person who buys on price alone is this man's lawful prey.


    John Ruskin (1819 - 1900)



    ZCars in Eastern Canada seaport ready for shipment to Europe

    http://ZSportCanada.com


  15. #15
    Formerly known as Koalia Reverend's Avatar
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    Im going to install Ramair in to mine (cause im cheap), i wonder do you just insert them over horns and thats it? The sucktion keeps them on place i guess.
    -72 240Z "Goldie"

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    Koalia, from what I gather, the two cut out holes on the back of the filters are fairly small so you get a good seal and the entire piece is light and stiff so there shouldn't be a lot of movement. The air horns should also limit up/down movement.
    I purchased a set of 3 online as well, post some pics when they arrive and I'll do the same.
    Chris
    Travel'n Man likes this.
    1970 240Z HLS30 01955 March/70

  17. #17
    Registered User Travel'n Man's Avatar
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    Quote Originally Posted by Koalia View Post
    Im going to install Ramair in to mine (cause im cheap), i wonder do you just insert them over horns and thats it? The sucktion keeps them on place i guess.
    I've been thinking of doing the same for easy on - easy off for go and show. Keep us posted with pics and feedback please.

    Is this the one that you guys purchased?
    3 x Ramair Carb Sock Air Filters Triumph TR6 Wide Port 150BHP Weber 40 Dcoe | eBay
    Last edited by Travel'n Man; 11-15-2013 at 05:44 PM.
    Life's a journey; enjoy the ride!

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    For some reason I can't bring up ebay at the moment but Weber 40 DCOE can mean only one thing, I'll post detailed pics when they arrive.
    1970 240Z HLS30 01955 March/70

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    Just got my new RAMAIR filters from England so here they are,
    Click image for larger version. 

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    Because the horn flare is so wide, 87mm I have to install the horns into the foam sock first then bolt to the carb body. I guess it looks okay, I was hoping for some of the horn showing but clean air is more important to me.
    Ramair says the filter socks are ready to use and are treated but I can not feel any oil of any kind on them.
    I rubbed them against glass and could see no film or smear. They feel like clean new foam, is there some kind of spray that is used now to attract dust?
    I am tempted to treat them with the UNI filter oil I have, anyone have any advice?

    And for no reason other then I think you guys will appreciate it I include a pic I found that I just think is beautiful,
    Click image for larger version. 

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    JDM Fairlady I think with motorcycle carbs, an honest engine bay, not too fussy, no bling but all business, simple and clean.
    Great shock tower brace.
    Last edited by grannyknot; 11-21-2013 at 04:45 PM.
    1970 240Z HLS30 01955 March/70

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    Registered User colinc's Avatar
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    Quote Originally Posted by grannyknot View Post
    Just got my new RAMAIR filters from England so here they are,
    Click image for larger version. 

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    Because the horn flare is so wide, 87mm I have to install the horns into the foam sock first then bolt to the carb body. I guess it looks okay, I was hoping for some of the horn showing but clean air is more important to me.
    Ramair says the filter socks are ready to use and are treated but I can not feel any oil of any kind on them.
    I rubbed them against glass and could see no film or smear. They feel like clean new foam, is there some kind of spray that is used now to attract dust?
    I am tempted to treat them with the UNI filter oil I have, anyone have any advice?

    And for no reason other then I think you guys will appreciate it I include a pic I found that I just think is beautiful,
    Click image for larger version. 

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    JDM Fairlady I think with motorcycle carbs, an honest engine bay, not too fussy, no bling but all business, simple and clean.
    Great shock tower brace.
    Looks great Chris.
    I had similar filters on my car (installed by PO). I used an oil spray that I picked up from a motorcycle shop. I forget the name but I think it is pretty standard stuff available at all motorcycle dealerships etc.

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    Chris
    Can you see any sunlight if held up to the sky on those? How dense are they? Did you order the 40 or 45 DCOE size?

    Thanks for the pic's. This may be the way I go on longer trips.
    Last edited by Travel'n Man; 11-21-2013 at 06:44 PM.
    Life's a journey; enjoy the ride!

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    Quote Originally Posted by grannyknot View Post
    Yeah, I have been looking at those for a while, this is the CAI box I would really like to get,
    Click image for larger version. 

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    Second pic (maroon Z) looks like an R-factory airbox, I just purchased one of these for my cold air setup. Max airhorn length I measured would be about 70mm with minimal clearance.

    Re filters. I'd run them dry unless specified otherwise. I ran uni filter socks, I've tried them oiled, then dry and it's messier when they are oiled. The positive was the oil seemed to help keep the dirt more on the outside of the filter, when dry I found more grit imbedded in the foam material and cleaning was taking at lot longer. If you do oil them, do it very lightly.

    Colinc 'JDM Fairlady' is my ride, it's just an AUS spec November 73 240. Pic was taken at a car show, filters were removed for asthetics, uni filter socks are not nearly as pretty as the ram air filters. It's a shame to hide the stacks under an airbox/filters but that's the trade off I guess.
    Last edited by riceburner; 11-22-2013 at 02:40 AM.

  23. #23
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    Travel n man, these filters will work for 40 or 45 DCOE, the holes on the back are about 1" dia and do fit tightly around the base of the horn. Below is a pic with the lens of the camera stuck inside the filter looking up a florescent light and you can see a bit of light.There are two layers that make up the filter, dark grey is fairly coarse and the lighter grey much denser and similar to the UNI standard foam next to it.
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    I emailed Ramair and they assured me that the foam has been treated but will need oiling after cleaning,
    I think I'm going to oil it anyway.
    1970 240Z HLS30 01955 March/70

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    Chris -
    Great info and pic's. I'll grab a set of these on ebay and run with. My car only travels in great weather for maybe 2000 miles yearly. I'll keep my screens but for my annual trip with my son in our Z's this filter will be perfect - easy on and easy off.
    Life's a journey; enjoy the ride!

    Mitchell
    L28 - N42 Block w/Flat tops - N42 Rebello Head & Cam - Triple 40 PHH Mikuni's - Headers - Recaro Seats -
    R180 3.9 Diff - Close Ratio 5 Speed - Toyota Vented Brake Upgrade w/ Porterfield High Performance Pads & Shoes

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    Formerly known as Koalia Reverend's Avatar
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    Good stuff. I've made my decision now, thanks to you.
    -72 240Z "Goldie"

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    Hey, I'm hoping they are good too, I haven't had a chance to start up the engine with them yet, but they do breathe well. As I said before, I'm going to oil them first regardless of the treatment that Ramair has done. I'm not up on all the new stuff out there but it seems to me that they may have sprayed them with some kind of static spray that attracts dust, oil I know
    and oil I trust.
    Chris
    1970 240Z HLS30 01955 March/70

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    Chris -
    Have you dyno'd yet - if you do let us know how they perform on and off - see if they make a difference. Do you have an AFR sensor? I have put my car up for the winter due to salt - if you still have yours out and know your stats let us know if these filters change anything
    Life's a journey; enjoy the ride!

    Mitchell
    L28 - N42 Block w/Flat tops - N42 Rebello Head & Cam - Triple 40 PHH Mikuni's - Headers - Recaro Seats -
    R180 3.9 Diff - Close Ratio 5 Speed - Toyota Vented Brake Upgrade w/ Porterfield High Performance Pads & Shoes

    1972 Datsun 240z
    HLS30-75040


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    Click image for larger version. 

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    Here is an interesting twist for cold air - a little stainless steel and a little fab time - could be a thought
    Blue likes this.
    Life's a journey; enjoy the ride!

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    L28 - N42 Block w/Flat tops - N42 Rebello Head & Cam - Triple 40 PHH Mikuni's - Headers - Recaro Seats -
    R180 3.9 Diff - Close Ratio 5 Speed - Toyota Vented Brake Upgrade w/ Porterfield High Performance Pads & Shoes

    1972 Datsun 240z
    HLS30-75040


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    The fuel flow (right to left through 3 carbs in parallel) , turbo distributor? and the fixture in front of the thermostat are interesting as well.


    Quote Originally Posted by Travel'n Man View Post
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    Here is an interesting twist for cold air - a little stainless steel and a little fab time - could be a thought
    Last edited by Blue; 12-04-2013 at 07:06 PM.
    There is scarcely anything in the world that some man cannot make a little worse, and sell a little more cheaply.
    The person who buys on price alone is this man's lawful prey.


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    ZCars in Eastern Canada seaport ready for shipment to Europe

    http://ZSportCanada.com


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    Supporting Member Zedyone_kenobi's Avatar
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    I have had ITG's
    Those round metal wire that clip to the opening of the DCOE air horn
    and Now I run the K&N Filter

    One thing to note. There is an opening on the side of the DCOE that allows air into the system to mix with the fuel idle jets and emulsion tubes. That little circle lets in air, and most of the time all of these filters DO NOT filter that air. So you could still be letting dirt into your fuel bowl. After my 1000 mile rally there was DIRT inside my fuel bowl. NOt much, but I feel that little circular opening NEEDS to be covered up.
    1971 240Z HLS30-38691
    93.9% done and getting better every day
    Now with 100% more DATSUN SPIRIT L28 Power
    1968 Datsun 2000 SRL311-03416

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    Excellent point Zedy. In fact, other than the dirt intake issue, the fuel bowl has to be at the SAME pressure as the inlet air going into the air horns. This is why that vent hole is right next to the intake, they are DESIGNED to be in the same air space, ie INSIDE the filter.

    With rad fan and other "wind"while moving, racing past the exposed vent holes, and the pressure drop inside the filters, the vent and intake air will not be at the same pressure.

    Now maybe, most of the time, the pressure difference is negligable, but not always....
    -----------------------------------------
    Jim
    73 240Z HLS30 149331
    69 510 PL510 77603

    www.zKars.com
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    An update. I'm still going to use these filters,
    Click image for larger version. 

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    but I put together these filters from the UNI foam so I could get them on and off quickly for test and tuning.
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    They might also be good for going to car shows as the Ramair filters are much tighter. Unless...I cut larger holes in the back so they install and remove easier - hmmm, worth thinking about.
    1970 240Z HLS30 01955 March/70

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    Supporting Member Zedyone_kenobi's Avatar
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    Not a bad idea. I like the look of open polished air horns for the Z, but also would never dream of operating like that for long drives. A quick pop off air cleaner would not be a bad idea for the bling factor.
    1971 240Z HLS30-38691
    93.9% done and getting better every day
    Now with 100% more DATSUN SPIRIT L28 Power
    1968 Datsun 2000 SRL311-03416

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