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Thread: Air filter trumpets

  1. #1
    Join Date
    Jun 2004
    Location
    Clacton
    Posts
    342

    Air filter trumpets

    I dont see how they improve the performance of the engine, I thought the idea was to get cold air into the engine these trumpets must pull in hot air from around the engine unless air scoops are cut into the rear boot lid .

  2. #2
    Join Date
    Aug 2002
    Location
    South Staffs
    Posts
    994
    two words for ya...

    Venturi effect.....


    PW
    'Beatless for 4 years now

  3. #3
    Join Date
    Jul 2008
    Location
    Dublin Ireland
    Posts
    244
    Any images or fitting instructions for these trumpets please ??

  4. #4
    Join Date
    Apr 2010
    Location
    Japan
    Posts
    412
    There are 2 types around. The more expensive ones (if you can find them) are individual and just push into place. I bought a cheaper unit, new, that has the three horns (70 mm length) welded to a plate that gets fixed with an existing bolt. Not hard to fit. It was a pretty crude thing though and I did a lot of smoothing first. It's thin aluminum and I worry about corrosion, but it seems to add some push above 7000 rpm


    Past Hondas:
    1960 125cc Honda Benly CB92R
    1964 305cc Super Hawk CB77, the only vehicle I have ever bought new in my life!
    Honda CB160, roadraced as 175cc 1967-1970.
    Honda Lawnmower, bought used in 2003, caught fire and melted in 2005.

  5. #5
    Join Date
    Jul 2006
    Location
    SoYo
    Posts
    760
    if you have the individual ones, warm the car up first, then turn off, remove the airbox and gently tap them in using a rubber mallet - but mind your hands on hot things! Click image for larger version. 

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  6. #6
    Join Date
    Jul 2008
    Location
    Dublin Ireland
    Posts
    244
    Thanks Folks , so i did do it right and also used a new filter , i can definatly say it sounds much nicer ,but as someone who isnt mechanically minded can someone explain to me what these trumpets are supposed to do and how that works . Mine are the individual ones .
    Cheers

  7. #7
    Join Date
    Aug 2002
    Location
    Kent
    Posts
    1,500
    Steve M
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    Its all gone Norfolk!!!
    Now in the Lotus position.

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