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Thread: Intake tuning for your quads

  1. #21
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    Has anyone come across information regarding the taper of the trumpets? Are there any theories regarding the impact of a tapered trumpet versus a straight sided affair, and how long the taper runs for (ie. the whole length of the trumpet), and the degree of taper over the length?

    Just some random ideas as I'll be shopping around for trumpets shortly as the adapter for the ITBs just arrived.

    Regards,
    Chris

  2. #22
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    I have been trying to figure this out for myself and I cant seem to find the information I want in books. All I could find is this informaton:

    The theory is that you are meant to have a venturi point going in from the valve to a choke point of 0.85 to 0.87 of the valve dimater inside the port and from that point outwards to the edge of the trumpet is meant to be one gradual angle increasing in size till the opening. Its all theory though and I couldnt find any real world testing however I should have another source of information coming soon that may have some more info on the subject.
    30kw club

  3. #23
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    I would imagine that it would be something that's hard to generalise. As your info pointed out, "...and from that point outwards to the edge of the trumpet is meant to be one gradual angle increasing in size till the opening.", the taper of the trumpet itself may have little to no impact if the rest of the inlet port has a different gradient. My only thought is that the trumpet taper might alter the venturi effect at the valve assuming that the rest of the port has zero taper and that there may be an optimal rate of taper to maximise the effect over the length of the tapered section.

    My uneducated guess would be a miniscule impact.

  4. #24
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    sounds like a damn good guess to me and I would risk agreeing with you on it. Either way I would very much like to see a dyno run with tapered trumpets and straight back to back both with equal lengths.
    30kw club

  5. #25
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    ive seen on some other 20v and formula atlantic 4age's have staggered size trumpets

    why is this

    it looks like its more for firing order
    JAPANESE DOMESTIC MARKET AS F*CK!!! hmmm, when you prenounce it properly, it sounds gay how bout that.

  6. #26
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    got a pic?

    they may have a motec ecu that allows for seperate fuel trims for each cylender for each rpm range to allow for a greater spread of power, got a pic?
    30kw club

  7. #27
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    thought this might interest you sam

    was talking to beerhead a while ago about this idea, basically need to draw up a graph of RPM vs maximum flow/vacumme effect produced by certain lengths of the intake track, then figure out some sort of controler circuit top control the length of the intake using a servo.

    these pics are off the "R1" motorbike, pretty much what i want to build one day....

    mmm automated variable intake length....


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  8. #28
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    I was personally thinking more along the lines of a servo motor with a linear resisitor for feedback
    30kw club

  9. #29
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    [attachment=19671:014.jpg]

    the 2nd and 3rd cylinder is longer than 1 and 4

    that motor is porn

    also what is those jets for that point into the trumpets?

    nos lol

    water spray?

    compressed air?
    JAPANESE DOMESTIC MARKET AS F*CK!!! hmmm, when you prenounce it properly, it sounds gay how bout that.

  10. #30
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    ok this I think i can answer with some sort of confidence, the outer two are longer for packaging only, or else the trumpets wouldn't have a full bellmouth. With that short of a difference the engine can still be tuned as a whole. The "jets" are fuel injectors, F1 trick that one, you gain high rpm atomisation at the expense of low down atomisation and proper fuel mixing
    30kw club

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