Discussion in 'Rack Mounted Engines' started by kerf, Dec 30, 2007.

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  1. kerf

    kerf Guest

    My original engine on this bike was a Mitsubishi TLE 43, very good engine with adequate power and super quite. Of course, as with most members of this forum, adequate just isn't good enough. When I was considering the CY R460, which has twice the power of the TLE43, I was warned that the power came at a price, headache level NOISE. This warning was well founded because it's basically a chain saw engine and sounds like one. I believed I could bring the DB level down to a manageable level and after several trial and error secessions I'm finally happy. At cruise, it's almost as quite as the Mits, although somewhat louder when you get down on the throttle but I can live with that. My secondary muffler is made from 1" copper tubing for the outer jacket with a full length ½" copper straight through baffle tube. The muffler is 11" long with 8" of the baffle tube bored with 48 - 3/16" holes to form a double helix pattern around the tube. The space between the outer jacket and the baffle tube is packed with fiber glass and the muffler can be repacked. I connected the secondary muffler to the primary with silicone tubing and so far it's working great.

    DDM was my supplier for the engine and the silicone exhaust tubing. They also have secondary mufflers that may work as well or better than mine at a reasonable price. Maybe it's just getting old, but for me, a quite ride beats a loud ride. In the end I'll take either one.

    Attached Files:

    Last edited by a moderator: Dec 15, 2015

  2. darcy

    darcy Guest

    Your "Quiet" ride.

    Glad to hear you have a "quiet" ride now. I may duplicate your success.


    Maybe it's just getting old, but for me, a quite ride beats a loud ride. In the end I'll take either one.[/QUOTE]
    Last edited by a moderator: Dec 15, 2015
  3. beast775

    beast775 Guest

    great xhaust

    very clean and well put together!:grin:did this motor come with an expansion chamber?ive got about 400 miles on my silicon tubing,and its not gonna melt,ever.i ran wot for 20 minutes,and nothing has changed.great build.did you put oil in yer staton box yet?im gonna do that next mnth.
  4. kerf

    kerf Guest

    The engine came with a muffler with an outlet on the back. I ordered another one with a bottom outlet to facilitate the secondary muffler. No oil in the box yet but I've been wondering about that. The moly grease Staton supplies works OK but I noticed that it had been thrown off the input gear, looked pretty dry when I swapped the engines. I added more grease but these engines turn high RPM and I doubt the lube will stay in place.

    Do you know anyone thats tried oil? I think it may seep past the shaft and inner bearing race and leak into the clutch but I don't know.
  5. beast775

    beast775 Guest

    bearing race

    well i also put extra grease on the gears,but i noticed that oil will seep through in more than 1 place on the boxes.i was gonna put some straight 70 weight in but didnt want oil everywhere,i guess i will look farther next mnth.i got to excited to ride and couldnt wait but,i got a backup now so it will be easier.:cool:i havent talked to no one who has oil in the gear box yet?im thinkin you could run those gears dry for years at low rpm as there designed.

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    Last edited by a moderator: Dec 30, 2007
  6. Hive

    Hive Guest

    Silicone Tube

    Where, pray tell us, did you acquire the silicone tube?
  7. kerf

    kerf Guest

  8. Hive

    Hive Guest

    Thanks Much!

    1000 degrees is the highest I have noted. Will investigate.

    May just construct a pipe made of copper like yours, though I only have a T-3300. Very slick job, I must say. You did it the way I thought I might, with the baffles etc.

    I may go with PVC first, to see if it really will reduce the engine noise from intake etc. If it works, will make a shorty like yours. Good job...and thanks again!
  9. Jim H

    Jim H Guest

    Really nice muffler kerf; may try that for my 40 tanaka.
  10. Hive

    Hive Guest

    Keep Us Posted, Please.

    There are a few of us fooling around with silencers, so maybe one will hit "paydirt."

    I bought some silicone tube from Dave's per Kerf's suggestion.

    Next will be putting the PVC together, not unlike what Kerf did.

    Will see....?
    Last edited by a moderator: Jan 26, 2008
  11. loquin

    loquin Active Member

    As a follow-up. I wanted to check out the "Significant" noise reduction that is reported at Daves Motors. So, I bought the 1 foot section of silicon hose and clamped it to the outlet of the muffler on my Mistubishi TLE43 engine, and fabricated a clip from a coat hanger to keep the hose bent into a "U". Then, fired up Mitsi.

    I DOD notice that the engine was a bit quieter, but, not significantly, as Dave states at his website. Possibly this is because the mitsubishi already is fairly quiet, with its muffler removing the bulk of the high frequency junk. If someone has an un-muffled engine, perhaps they could try the experiment also.

    Attached Files:

    Last edited: Feb 4, 2008
  12. kerf

    kerf Guest

    I tried that on the R460, which sounds like a chain saw. With a foot of tubing, it sounded like a chain saw with a rubber hose on the exhaust, not good. That is the reason for the muffler of the week club, which culminated in a 12 1/2" glass pack and solved my problem. I did use the silicone hose to make my muffler connection.

    You are correct about the TLE43 being very quite. My wife has jumped claim on mine and will fight before giving it up.
  13. cooltoy

    cooltoy Member

    Thanks for the laugh kerf! Now what's this "muffler of the week club" and how can I get "one"? Being in a small town, I hate the fact that they can hear me from a mile away.
  14. kerf

    kerf Guest

  15. iRide Customs

    iRide Customs Member

    That's a sweet muffler and a sweet setup.
  16. Hive

    Hive Guest

    I Agree

    And am holding myself back from building it, because then I will want to take the bike out and the weather here is dismal.

    BTW, on that very nifty Mitsubishi engine = low price is current offer.

    Also noticed it was here: as well.

    Will post separate. = Mitsubishi TLE43 Motor [4207] $265.00
    Last edited by a moderator: Feb 5, 2008
  17. loquin

    loquin Active Member

    It looks like success...


    So, I stopped by Ace Hardware, & picked up a lawnmower "pancake" muffler (ref attached pic,) two feet of 1/2 inch copper pipe, an adapter (1/2 copper to 1/2 NPT) and a couple of 1/2" copper elbows. The bundle was $11.

    Hooked it up temporarily as per the attached sketch, and the engine/clutch/bearing noise was louder than the exhaust! The little muffler doesn't seem to add much (if any back) pressure. Which isn't surprising, as it was designed for a 3-4 HP 4-stroke.

    It looks promising! When I get everything brazed together, mounted, and road tested, I'll report back.

    (I'll probably also try the tubular lawn mower muffler also, before assembling everything. It's also less than $3, so, it's worth testing first... Ref Muffler.gif)

    Attached Files:

    Last edited: Feb 13, 2008
  18. Hive

    Hive Guest



    Very cool idea.

    What are the dimensions?

    May save lots fo time and grief. What a good idea...
  19. loquin

    loquin Active Member

    I'll measure it when I get home. It's about 2 1/2 to 3 inches in diameter; about two inches thick, with a 1/2 inch NPT nipple (intended to thread directly into a Briggs & Straton block.)

    (I like to use "off the shelf" hardware if I can.)

    OK - I measured it. The 'pancake' muffler is 2-1/2 inch in diameter by 1-1/2" thick. The tubular muffler is 3-1/4" long (not including the threaded nipple,) by 1-1/2" in diameter.
    Last edited: Feb 13, 2008
  20. Stink Bike

    Stink Bike Member

    This looks great.Please let us know if it works.