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simple header baffles

Discussion in 'The Hokey Ass Message Board' started by Glen, Oct 31, 2008.

  1. Glen
    Joined: Mar 21, 2001
    Posts: 1,789

    Glen
    Member

    This question pops up every six months. I made these tonight. The cones and perforated tubes are from Cone Engineering. They ship very fast and service is always good (hamb alliance too).

    The donuts were cut by water jet locally ($6.00 each), the front one is 3.0" od and 3.875" on the back. I plan to pick up springs like the dirt bikes use and weld some tabs onto the ends to secure the baffles.

    now I can run the cam in and then I can drive it around the block.

    [​IMG]

    [​IMG]
     
  2. striper
    Joined: Mar 22, 2005
    Posts: 4,498

    striper
    Member

    How loud are they? They don't look like they would have huge effect. I need to make some too so I'm interested to know.

    pete
     
  3. Glen
    Joined: Mar 21, 2001
    Posts: 1,789

    Glen
    Member

    We will find out tomorrow, I also plan to pack them. I think they will be ok at idle, but once you press on the gas it will probably blow straight thru.
     
  4. Glen
    Joined: Mar 21, 2001
    Posts: 1,789

    Glen
    Member

    wish me luck. Hopefully this is quiet enough. The insulation is FMF pipe wrap secured with safety wire.

    [​IMG]

    [​IMG]
     
  5. Harris
    Joined: Feb 15, 2007
    Posts: 863

    Harris
    Member

    Wow, mind if I ask what the total you have into these? I love the pipes, but have been looking to find some sort of baffle....
     
  6. super plus
    Joined: Dec 14, 2006
    Posts: 566

    super plus
    BANNED

    And when you need shreaded chesse on your salad they work great also , just kidding , they look great
     
  7. Glen
    Joined: Mar 21, 2001
    Posts: 1,789

    Glen
    Member

    the inserts from Cone eng are $15 each (before your alliance discount). I paid $50 to have the 8 donuts water jet. The pipe wrap was $20.00. Sure I could have bought glass packs or Stinger baffles, but that would not be any fun. But at the same time.... time is money, I would not cut those 8 donuts when I can have them water jet for $6.00 each including the material.
     
    Last edited: Nov 1, 2008
  8. Jerod Jardine
    Joined: Dec 27, 2007
    Posts: 67

    Jerod Jardine
    Member
    from wyoming

    Those are bitchen. Cone makes some nice stuff. If you flip the baffels around, openings to the rear, they'll be quieter and flow more.
     
  9. roosters hot rods
    Joined: Oct 21, 2006
    Posts: 1,778

    roosters hot rods
    Member

    great looking work there glen..
     
  10. slammed1
    Joined: Dec 5, 2007
    Posts: 192

    slammed1
    Member

  11. Dirty2
    Joined: Jun 13, 2004
    Posts: 8,902

    Dirty2
    Member

    Make shure when U start it up your outside because insulation is going to blow everywhere !
     
  12. I made a set by cutting slices in my collector flare. The local track requires mufflers for night runnning and since I usually run test and tune I figured I would need them. The fellows who help me at the track say from 10 feet away it is actually pretty quiet. They are not unlike what a gun silencer is. Even driving the car it is not that loud. I was surprised how well it worked so yours will be way quieter than that.
     
  13. skwurl
    Joined: Aug 25, 2008
    Posts: 1,620

    skwurl
    Member

    I took a cherry bomb ,cut the two ends off, shoved up the pipe and used a sheet metal screw to hold it in. Works ok. These look better
     
  14. Candy-Man
    Joined: Mar 21, 2006
    Posts: 1,715

    Candy-Man
    Member

    I built the same exhaust for a 425 Nailhead in a 30 Coupe, some 3 years ago. I ended up welding two thick washers to the front of the cone to silence the tone a little more while increasing the back pressure to prevent the backfiring during deceleration.....
     
  15. Glen
    Joined: Mar 21, 2001
    Posts: 1,789

    Glen
    Member

    An update on these baffles. I ended up making a set of turnouts for the ends. I like the look of them without the turnout.... but on the freeway it was way too loud. I sit in the back of the car and the exhaust was basically pointed at you. I put the mount tab on the turnout and it bolts to the baffle which still slides in. I now have two sets of baffles, one for the track and one for the street. I have way too much time in these but Im happy with them.

    [​IMG]
    [​IMG]
     
  16. Glen
    Joined: Mar 21, 2001
    Posts: 1,789

    Glen
    Member

    The turnouts were made by flowmaster, I cut about 3" off the end to shorten them as much as possible then weld them to a disc I made that fits my header.

    Go to Summit and type "turnout" in the search field, you will see a wide variety of them.
     
  17. Beef Stew
    Joined: Oct 9, 2008
    Posts: 1,253

    Beef Stew
    Member
    from So Cal

    get any smoke out of your crank case ventilation setup?
     
  18. Shifty Shifterton
    Joined: Oct 1, 2006
    Posts: 4,964

    Shifty Shifterton
    Member

    You can make your own. I used to have a bike with the same concept except holes instead of louvers. The front of the pipe was capped, and the front disc was more like a welded wire support so the gas could pass around the tube, thru the perforated holes, and out the baffle's core.

    I've seen bikes the other way too, with a capped center and ring of holes around the pipe's perimiter for exit. They must be pumping into a closed-end tube, passing thru the packing, and exiting the outer edge.

    When the cops started hassling me, literally went into the attic and peeled a layer of insulation, wrapped the core, restrained it with a coat hanger wrap. Cut the noise in half. Blew little chunks of insulation fiber every time it was revved high and had to be repacked every couple months. Good times. I'd recommend buying proper packing like Glen.
     
  19. Glen
    Joined: Mar 21, 2001
    Posts: 1,789

    Glen
    Member

    Sorry the perforated tubes are from Cone engineering also at $15 each. take a look at their site for sizes and prices. They are an alliance vendor too

    no....there is a baffle inside the breather cap. That was another reason for the turnout, I couldnt locate my pan evac in the header because of the way I mounted the baffle. Thats a typical setup on a lot of rails.

    That FMF dirt bike packing is very thick and has not blown out at all (and its cheap).
     
    Last edited: Feb 27, 2009
  20. Harris
    Joined: Feb 15, 2007
    Posts: 863

    Harris
    Member

    I ordered basically the same setup from cone engineering (great guys to deal with BTW) should be arriving on Monday. Do you by any chance have a link to where you got the turnouts? Cone doesn't have 'em and I really like the look - and yes I plan on shamelessly copying your idea for using the springs to have the option of removable baffles....
     
  21. Glen
    Joined: Mar 21, 2001
    Posts: 1,789

    Glen
    Member

    Yes, that info is listed above. They are made by Flowmaster and summit sells all different sizes. Use the search function on Summits website and type in the word "Turnout"
     
  22. panic
    Joined: Jan 3, 2004
    Posts: 1,450

    panic

    Not an answer to all problems, but the interior volume of the muffler is very important - bigger is always quieter with no power loss.
    If you can't make the muffler bigger, there's another method (if you have the room, and don't want the volume to show).
    Use a hidden (inner and under) connector and the largest connecting T pipe you can fit to a big can between the inside of the frame rail and the driveshaft. It can be 3" or 4" exhaust tubing, 2, 3, 4 feet long with both ends capped off. That's right - closed, it has no exit.
    The gas expands into it, and takes a lot of the "bang" out. It doesn't get very hot since gas doesn't go through it continuously.
     
  23. layin_frame_56
    Joined: Feb 11, 2007
    Posts: 312

    layin_frame_56
    Member
    from Ohio

    Nice set up. Who made your headers? And do they make them like that for the SBC? Thankx
     
  24. Glen
    Joined: Mar 21, 2001
    Posts: 1,789

    Glen
    Member


    I made the headers
     

  25. Hmmmm
     
  26. draginsteel
    Joined: Oct 21, 2007
    Posts: 463

    draginsteel
    Member

    Has anyone ever run straight tail pipes from the headers out the back of the car and added baffles along the way? Would they effect performance less near the header or at the back?
     
  27. panic
    Joined: Jan 3, 2004
    Posts: 1,450

    panic

    If you say so.
     
  28. Retro Jim
    Joined: May 27, 2007
    Posts: 3,853

    Retro Jim
    Member

    Another thing that has been proven by a Dyno is that the "H" pipe or a "X" over will increase HP ! I have read about it and it works and also helps cut down on noise too !
    The closer the cross over or conection between the 2 exhaust pipe is to the headers the better . Was proven on a Y block race engine & gained more not 1 or 2 HP , more like 7+ HP ! Hard to believe but true . Try it and you will see the difference , plus less noise & popping noise when you let off the gas pedal !
     
  29. Shifty Shifterton
    Joined: Oct 1, 2006
    Posts: 4,964

    Shifty Shifterton
    Member


    What he's described is basically an expansion chamber. The main reason an h pipe works is it smooths pulses by offering the other side's pipe volume at the peak of a pulse. The sides can't pulse in unison since plugs fire one at a time, so each cylinder is unique at any point in time.

    H pipes don't really flow alot of gases, more like the same gases pulsing back n forth

    Remove pulse from a gas, and it flows smoother. And allows the mufflers to work better. And pipe volume does effect resonance. Lot of things going on there...
     
    Last edited: Feb 27, 2009
  30. CoolHand
    Joined: Aug 31, 2007
    Posts: 1,933

    CoolHand
    Alliance Vendor

    It's like a water hammer arrestor, but without water. lol

    It's just dead space connected to, but off the beaten path (so to speak) of, the exhaust system for pressure pulses to dissipate into.

    The pulses ripple up into the tube and are damped out by molecular and surface friction of the gas.

    It's really only for sound deadening, where the H-Pipes have legitimate performance uses too.
     

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