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No Air Horns

Discussion in '308/328' started by walawdog, Jun 21, 2005.

  1. walawdog

    walawdog Formula Junior

    Nov 9, 2004
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    Bluefield, WV
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    Anthony
    #1 walawdog, Jun 21, 2005
    I am replacing the airbox on my 1978 308 with individual aircleaners. Unfortunately, the airhorns will NOT fit under the filters. I remember some discussion regarding the need to have the correct height of airhorn to allow the carb to flow properly. Number one, is this true? What will happen if there are no horns on the carbs? Also, who is selling the short airhorns?

    Thanks in advance for the info.
     

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  2. T-Yoro

    T-Yoro Rookie

    Apr 25, 2005
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    Ton Yoro
    #2 T-Yoro, Jun 21, 2005
    You might want to check durable1 he's the one selling those "shorty" airhorns.
    www.durable1.com
     
  3. thecarreaper

    thecarreaper F1 World Champ
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    #3 thecarreaper, Jun 21, 2005
    Last edited by a moderator: Sep 7, 2017


    unless your airhorns have been changed, they will fit . i installed them on my 78GTS and my 77GTB, the 74 Dino has the wierd -12 webers that wont take the regular air cleaners from Pierce. let me know if i can help you, perhaps you can post a pic.
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  4. thecarreaper

    thecarreaper F1 World Champ
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    #4 thecarreaper, Jun 21, 2005
    also, i added a k&n crank case vent on the vent tube. i originally made a tube and connected it to the white tube you see in the pic, but i found that the car was sucking the rubber section of the tube shut during high rpm's. will post a pic and part number today of the vent installed.
     
  5. walawdog

    walawdog Formula Junior

    Nov 9, 2004
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    #5 walawdog, Jun 21, 2005
    My airhorns don't fit because I am not using the same aircleaners you are. I have the more oblong shaped all foam rounded top aircleaners. I think I will need to go with the short stacks from Durable. But any thoughts on how the car will run with NO stacks?
     

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  6. thecarreaper

    thecarreaper F1 World Champ
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    #6 thecarreaper, Jun 21, 2005

    ok, sorry, i thought you were using the same ones i am using. there are several threads on airhorns in the archives. i for one dont think its a good idea to run without them, and i have no real opinion on the Durable One horns based on the mixed reviews i have read here. Michael
     
  7. hanknum

    hanknum Formula 3

    Nov 1, 2003
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    #7 hanknum, Jun 21, 2005
    I don't have any experience with running it w/o stacks, but my gut feeling is...I wouldn't do it. I believe the horns smooth the air flow as well as increase the air velocity (hence they are sometimes called velocity stacks).

    On another note, I've heard the foam filters are not that good...more restrictive and less filtering.

    Just my $0.02

    Henry
     
  8. don_xvi

    don_xvi F1 Rookie

    Nov 1, 2003
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    #8 don_xvi, Jun 21, 2005
    I agree, you want to run SOME air horns. The length of the intake tract is a tuning parameter, theoretically shortening it will increase the RPM at which the intake is most efficient, and that's been debated ad nauseum in other threads.
    There shouldn't be any debate that having the sharp edges of the carb throats responsible for straightening the flow rather than a rounded edge of an air horn will reduce flow.
     

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