ANeat,

Your muffler parts look great!

What is the wall thickness of the tubing you used to make your muffler?

What are the hole diameters in the baffles?

Thank you,

Brian

Thanks Brian; The holes are 3/8 dia. The tubing is .049 6061 aluminum.
Adam

bdtsr
Very nice pics and planes. The plug(s) in the end of the conduit box are they metal? They have plastic plugs locally. Had alum plugs made welded in ends.

I'm having trouble keeping exhaust bolts tight. Any suggestions will be appreciated.

The bolts on my Ryobi are all those slightly tapered trianglular (sp) type. What is the purpose for that stlye? Can they be replaced with round standard bolts? I figured they may be for use in alum so have not messed with them.

As yet have only tightened without Locktite. Is there a problem using locktite repeatedly in alum holes?

Mike the triangular bolts are a type of thread cutting/forming bolt that they can screw into a hole without it being tapped and it will cut its own threads. It makes the weedeaters cheaper to manufacture. Going to a standard bolt may help keep them from loosening up but you can also get Locktite blue that is made for bolts to be removed and re-installed.

Adam

Mike, Thanks! Yes the plugs are aluminum and were available separately. I did smear JB Weld over them to seal them in permanently.

Test running and most of the bolts are loose. mount bolts loosened and until I found them could not get it to start. Started right up once they were tightned.

Think I'll stay with the original bolts for now. Have not checked but I bet the pitch is odd-ball.

ANeat,

How are the canister mufflers holding up and how is the sound level/engine performance with them?

Brian

Hi Brian; The gentleman who designed the first ones has them in a Lanier Staudacer, BME 105 powered. He has been flying IMAC with his setup most of the summer. There is a pic of his instalation in my gallery. So far they have been holding up very well, Only flying time will tell.
The sound level on my 46cc Poulan is in the mid to high 80db range with a 200 to 500 rpm drop from an open header. I keep playing around modifying things. I regret to say I have yet to get a flying combo together for the Poulan due to to many other projects going on this summer so I have had to rely on other guys flying for any muffler testing.
Adam