four stroke expansion chambers...

Discussion in 'General (Main)' started by Motosportz, Dec 5, 2014.

  1. Motosportz CH Sponsor

    Location:
    Vancouver WA
    Husqvarna Motorcycle:
    2021 TE250i, 570 Berg, 500 KTM, 790R
    Other Motorcycles:
    many
    First power and mega bomb and then everyone jumped on. Now it looks like Dungeys new bike has a 4st expansion chamber. Interesting.

    [IMG]
  2. lankydoug Husqvarna
    Pro Class

    Location:
    MO
    Husqvarna Motorcycle:
    WR
    Other Motorcycles:
    TM 300en
    Must be a one cylinder thing to dampen the pulse and minimize reversion... at least that's all I can imagine it does.
  3. juicypips Husqvarna
    Pro Class

    Location:
    gloucestershire
    Husqvarna Motorcycle:
    wr 360. 2002
    Other Motorcycles:
    Gas Gas TxT 300, Yamaha wr250f
    Nah its so the guys dont feel like such pussies on a bike without an expansion chamber!
  4. justintendo klotz super techniplate junkie

    Location:
    mercer, pa/northwest pa
    Husqvarna Motorcycle:
    84 250,86 400,87 430,88 250,95 360
    Other Motorcycles:
    99 kawasaki zrx 1100
    awwww, isnt that cute! it grew a little expansion chamber..
    Theo, troy deck and LandofMotards like this.
  5. johnnyboy Husqvarna
    Pro Class

    Location:
    UK
    Husqvarna Motorcycle:
    WR 125
    Other Motorcycles:
    TM 250f
    PAH !!! That design has been around for years, The chinese developed it in their search for MX /Enduro domination but at the time couldnt afford to pay a top rider to ride the bikes LOL
    230b.jpg
    David Hudson and Ohio Joe like this.
  6. juicypips Husqvarna
    Pro Class

    Location:
    gloucestershire
    Husqvarna Motorcycle:
    wr 360. 2002
    Other Motorcycles:
    Gas Gas TxT 300, Yamaha wr250f
    Thats a motoped by santa cruz 50cc pitbike engine. Innit?
  7. juicypips Husqvarna
    Pro Class

    Location:
    gloucestershire
    Husqvarna Motorcycle:
    wr 360. 2002
    Other Motorcycles:
    Gas Gas TxT 300, Yamaha wr250f
  8. juicypips Husqvarna
    Pro Class

    Location:
    gloucestershire
    Husqvarna Motorcycle:
    wr 360. 2002
    Other Motorcycles:
    Gas Gas TxT 300, Yamaha wr250f
    Nope was wrong lol
  9. Motosportz CH Sponsor

    Location:
    Vancouver WA
    Husqvarna Motorcycle:
    2021 TE250i, 570 Berg, 500 KTM, 790R
    Other Motorcycles:
    many
    that front fender looks like it is going to do a lot :D
  10. 268fords Husqvarna
    Pro Class

    Location:
    Powell, Wyoming
    Husqvarna Motorcycle:
    08' TE510'
    Other Motorcycles:
    Honda CRF 100, Kawasaki KLX 110
    Boy that looks like it would break the first time it was ridden!
  11. Tinken Husqvarna
    Pro Class

    Location:
    Hesperia, CA
    Husqvarna Motorcycle:
    MY12 WR511
    Other Motorcycles:
    Yamaha
    Looks like a resonator to me.
  12. Big Timmy Husqvarna
    Pro Class

    Location:
    (South Eastern) AZ.
    Husqvarna Motorcycle:
    2015 FE 501 with lots of goodies.
    Other Motorcycles:
    BMW G450X, 15'FE501, 23 KTM 1290 SAR
    Looks to me like the patent on the "FMF Mega Bomb" resonator has ran out.
    ray_ray and troy deck like this.
  13. Tinken Husqvarna
    Pro Class

    Location:
    Hesperia, CA
    Husqvarna Motorcycle:
    MY12 WR511
    Other Motorcycles:
    Yamaha
    There is no patent on a FMF mega bomb, never was one, in fact they stole that design from someone else. FMF claims a patent on the power bomb(2005), but they could not patent it until Akropovic's patent ran out after 20 years. Akro still makes the best resonators, tube on top of tube design.
  14. Big Timmy Husqvarna
    Pro Class

    Location:
    (South Eastern) AZ.
    Husqvarna Motorcycle:
    2015 FE 501 with lots of goodies.
    Other Motorcycles:
    BMW G450X, 15'FE501, 23 KTM 1290 SAR
    I fully agree with the Akropovic's design as being the best. But the price for any brand's full system is ridiculous. I have a very similar set of resonators right before the rear mufflers on an HKS Dual SS Exhaust system on a Nissan 350Z. It was mirror polished SS, Tig welded, Probably 30+ times more material and work to fabricate and it costs less than a full Titanium single 4 stroke system for a big bore bike made by Akropovic. Explain why that is and we would all be happy.

    Everybody steals things from each other in the motorcycle marketplace but FMFs design is something they have further developed from the original Powerbomb design and they still have everyone and themselves raving about it. There's not much to it really, it is very simple. {See picture below of it's internals.}

    We already know about FMF falling out of favor with you for whatever reason and I'm sure you have your own reasons. So I won't argue with you on that.

    They are all way overpriced for what you get and for the cost of material to build such a system, regardless of what alloy is used SS, Titanium, etc. or who manufactured it..

    ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,collecteur-fmf-mega-bomb-titane.jpg
    ray_ray likes this.
  15. ray_ray Mini-Sponsor

    Location:
    The Philippines
    Husqvarna Motorcycle:
    08\013 WR250, 010 TC250, 012 TC250
    Sounds like someone is playing with words again ... Like that play on the word synthetic in the oil world ... I'm not sure we have that oil thing hashed out just-right, yet...
    Big Timmy likes this.
  16. Mike-AK Husqvarna
    Pro Class

    Location:
    Alaska
    Husqvarna Motorcycle:
    2012 TE 310

    Yeah...they ripped off that Heimentwatz guy. Regardless of what you call 'em, the one on my 310 seems to help the low and mid-range a lot.
  17. LandofMotards Moderator

    Location:
    Colorado
    Husqvarna Motorcycle:
    2014 TC250
    It's because they fund tons of race teams and not just fast and furious magazine for exposure ;)

    Really though, all these motorcycle exhaust companies need to not only have the racers but also advertise like crazy. They are priced stupid high for the willing though
  18. huskylove Husqvarna
    Pro Class

    Location:
    norcal
    Husqvarna Motorcycle:
    1999 cr125 in progress
    It emulates a longer header pipe to help scavenging at low rpm. It does not affect top end power.

    Thats my opinion anyways.
    Mike-AK likes this.
  19. huskylove Husqvarna
    Pro Class

    Location:
    norcal
    Husqvarna Motorcycle:
    1999 cr125 in progress
    fmf is out of favor because its unnecessarily loud.

    I got my slip on for 175$ so I am DEFINITELY not complaining, but man is it one loud mother....
  20. Mike-AK Husqvarna
    Pro Class

    Location:
    Alaska
    Husqvarna Motorcycle:
    2012 TE 310

    My Q4 with PowerBomb is not any louder than stock. In fact, I was hoping for a bit more raspy exhaust note that did not materialize.