Baffle in or out

Discussion in 'Whizzer Motorized Bicycles' started by peter nap, Jun 20, 2008.

  1. peter nap

    peter nap Member

    I have one of the high flow baffles. Is there any benefit from taking it out and running a straight pipe.

  2. bill green

    bill green Member

    Yes ****ing off the guys with the pen and ticket book ..HAHA howdy most motor run better with some back presure ..Bill Green
  3. peter nap

    peter nap Member

    Thanks Bill!
    No noise statutes here fpr pipes but I don't like listening to them unless I'll get some real improvement in performance.
  4. RdKryton

    RdKryton Active Member

    What Bill said. I personally like the sound of the hi flow insert too.

  5. Quenton Guenther

    Quenton Guenther Motored Bikes Sponsor

    Hi Peter, Usually the only gain is approx 1 MPH on the top end if using the larger pipe, but loses a lot in the mid range [3000 to 5000 RPMs]. Have seen a few motors lose power on the top end with the insert removed. Not all inserts are created equal, and the good ones have the center pipe flush at each end.

    Have fun,
  6. Mountainman

    Mountainman Active Member

    From just what I have heard over the many years while riding on and repairing at times many small engines... 4-stroke baffle removal -- not a big deal -- more noise -- with that maybe as already mentioned -- more cops ----- where as to remove a 2-stroke baffle could toast the engine due to no back pressure.. Check your specks - back pressure may be required.. Happy riding from Mountainman
  7. peter nap

    peter nap Member

    Thanks Guys!
  8. turbo/chaos

    turbo/chaos Guest

    this works good for flow and noise ok cut the baffel down to only a inch and a half for start or more but fill it up with steal wool that you clean grills with and it makes it a lot silent on top of performance but its a trial and error till you get it right but it really works
  9. Quenton Guenther

    Quenton Guenther Motored Bikes Sponsor

    Did you get the hi flow insert from me? If not you need to remove it and make sure the ends are "flush". If they are not, cut the perferated tube so that it is flush on both ends. If the tube is extended on the front side [towards the front of the bike],it will cause major turbulance and effect both power and gas mileage. I noticed several people have different concepts, but let me assure you I know about exhaust systems on the Whizzer motor. In fact the current insert is a close copy of an insert that Tom Hand [leading exhaust expert] and myself developed and tested approx 4 years ago. The insert was tested hundreds of times, and many of the times the tests were run on several different Dynos. Other than making the ends even, DO NOT make any other changes. If you drill extra holes, or remove the material the insert will perform much worse, I know this to be a fact. The untimate exhaust pipe on a Whizzer motor is 28 1/2" long [not counting the exhaust manifold in the measurement], the end of the pipe cut at a 45 degree angle [echo chamber cut off]. Just ask anyone that attended the dirt drags at Dawson Springs, Ky last month, how effective a tuned exhaust sytem can be.

    Whizzer OuterBanks,
  10. peter nap

    peter nap Member

    Quenton, it came from Whizzer and Ron Sutton installed it when he fixed the other batch of problems.

    I'm not sure what it's supposed to be flush with. It's recessed about 1/2" in from the shortest part of the pipe end.

    Here's a picture of the baffle. What should be cut?



  11. Quenton Guenther

    Quenton Guenther Motored Bikes Sponsor

    Hi Peter, If both ends are the same as the picture showing the open pipe, then it is exactly what you need. In the other photo [with the tape measure] it shows the gold wrap, just leave it like it is.

    Have fun,
  12. peter nap

    peter nap Member

    Thanks Quenton!
  13. rj1967

    rj1967 Member

    I bought a used 80cc 2stroke and I see lotta different opinions about this so plain and simple....will removing or punching holes in baffle cause my bike to have any more power? Not worried about noise. I do lose a lot going up hill or against the wind. So would this be helpful or harmful? Thanks.
  14. The_Aleman

    The_Aleman Active Member

    Well for one, you bumped up a nearly 7 year old dead thread about 4-stroke Whizzer baffles. That's some kinda goofy necro, IMHO!

    Two, the stock 2-stroke muffler works just fine unless you actually _want_ more power.
    If you want an increase in power via exhaust tuning, a tuned expansion chamber is a must.
  15. rj1967

    rj1967 Member

    I been flirting with the idea of an expansion chamber. How much upper and lower end torque we talkin? And if I get one do I need to adjust the carb?