Street Twin Hi Flow Air Filter

Discussion in 'Triumph Twin Power' started by Syd, Nov 25, 2018.

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  1. Syd

    Syd New Member

    Feb 28, 2018
    2
    3
    Christchurch, New Zealand
    I'm keen to know if anyone with a Street Twin has changed over the stock air filter and fitted a K&N Hi Flow Air Filter and found that it makes a difference? If so, is this easy to do and will the ECU management system handle the new air filter with the higher flow rate without adjustment? Cheers
     
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  2. Callumity

    Callumity Elite Member

    Feb 25, 2017
    3,407
    800
    Nr Biggar
    The unvarnished truth?

    K&N are very successful at profitably marketing a product that filters air. Plenty other brands do it just as well (the filtering) and with marginal differences in flow rates. Some better, some worse.......

    Sometimes engines are best thought of as air pumps. Their total flow is a function of everything between inlet and tail pipe; fuelling, inlet tract, valves, camshaft, exhaust port, exhaust.....

    By all means fit a K&N but on its own but you will not notice a blind bit of difference. And don’t assume the stock filter is more restrictive. Marketing remember........
     
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  3. Syd

    Syd New Member

    Feb 28, 2018
    2
    3
    Christchurch, New Zealand
    Thanks for that and fair enough. I'll leave it as no point spending money and time on this for no return, cheers.
     
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  4. joe mc donald

    Subscriber

    Dec 26, 2014
    12,275
    1,000
    slough / burnham
    Syd
    I changed my 59 Bonneville and it didn't need any maps. I also removed the snorkel it was fine.
    Ride Free
    Joe.
     
  5. Syd

    Syd New Member

    Feb 28, 2018
    2
    3
    Christchurch, New Zealand
    Nice and simple, sounds good to me..
     
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  6. BigCLM

    BigCLM Senior Member

    Nov 30, 2017
    1,017
    243
    San Rafael, CA
    I put a K&N air filter on my street twin. The K&N is oiled which will filter much better than the paper stock filter. I don't really notice a performance improvement but I just want the cleanest air possible to my engine. Possibly overkill but I always treat my bikes with ultimate respect !!

    It was not hard to install. I actually found a utube video which helped.
     
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  7. BigCLM

    BigCLM Senior Member

    Nov 30, 2017
    1,017
    243
    San Rafael, CA
    And no remapping is necessary.
     
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  8. joe mc donald

    Subscriber

    Dec 26, 2014
    12,275
    1,000
    slough / burnham
    BigClm
    I did the same and like you always do all my bike to the best. I took the snorkel out and it give it a nice deep rumble deep down. You do lose most of the overrun popping but it sounds good.
    Ride free
    Joe.
     
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  9. Callumity

    Callumity Elite Member

    Feb 25, 2017
    3,407
    800
    Nr Biggar
    The thing is.......

    Dry paper filter elements generally filter more particles out than oiled filters. The difference is marginal (of the order of 99% v 98%) just as the claimed increased in airflow is highly marginal.

    The real advantage is cost if you religiously changes air filters every year. A K&N will pay back in year 4. How long did you say you kept your bikes?

    Then again, if you over oil your filter as many do (just to be sure!) then you lose all its supposed benefits .......

    I am NOT rubbishing K&N (I have used them on side draught Webers). I am merely reminding folk that like angling gear a LOT of stuff catches more anglers than fish.........
     
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  10. Retired Phil

    Retired Phil Well-Known Member

    Jun 22, 2017
    200
    93
    San Rafael
    the biggest downside to an oiled air filter is that some of the oil from the filter will find it’s way into the throttle bodies- not good, and turn to gum. This I know from personal experience on several cars and bikes. if you dont oil it then why change from filter is the first place? like others have said, they have great marketing hype. Save your $ and just take off the snorkle.
     
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  11. steve lovatt

    steve lovatt Something else
    Subscriber

    May 12, 2014
    8,543
    1,000
    Winchester
    Have to agree with Callumity here. On it's own, a K&N or any other free-flow oiled filter will not make any difference at all.

    I did the Triumph Twin Power (TTP) Stage 1 Induction mod on my 865 EFI air cooled Bonnie, which includes a DNA Filter and velocity bell-mouth intake in place of the snorkel. You then need to remove the air box baffle, the secondary air injection system and the O2 sensors and fit some improved flow exhausts (I already had TORS fitted) and get the remap from TTP and install it via your laptop using TUNE ECU.

    According to TTP:

    The Bonneville/T100 and Thruxton benefit greatly from stage 1 mods. The mid range has not only been boosted by just under 9%, but the torque hole between 3500rpm and 5500rpm of the standard model has been filled to give virtually flat torque between 3400rpm to 5800rpm. Peak power has moved up to around 8400rpm.

    Conclusion


    Per Model Power & Torque Figures

    Model Induction Exhaust Peak Power (BHP) Peak Torque (ftlb) Max Torque Increase

    Bonnie & Thruxton OEM OEM +0.0% (60.64) +0.0% (46.84) +0.0%


    Bonnie & Thruxton Stage 1 TORS +5.6% (64.06) +8.4% (50.78) +15.9% @ 4,200 rpm







    Well worth doing as it transforms the bike :cool:

     
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  12. Callumity

    Callumity Elite Member

    Feb 25, 2017
    3,407
    800
    Nr Biggar
    I am not particularly familiar with the Street Twin and later water cooled motors but the biggest simple ‘bang for buck’ performance improvement (if that is what you are looking for) seems to come from replacing the restrictive catalytic converter with an x pipe like this
    https://www.squaredeals-ltd.co.uk/t...thruxton-1200-bonneville-t100t120-39301-p.asp

    Subject to NZ legislation it’s about 190 dollars plus shipping.
     
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  13. Glyn Phillips

    Glyn Phillips Old’N’Slow

    Jun 21, 2018
    973
    750
    Essex
    How much oil did you put on the filter?
    I’ve used oiled filters for donkeys years, a mild spray on the outside of the filter, not the induction side will never pass through.

    I’m not saying they’re any better than a standard filter but if looked after correctly, they will last many years
     
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