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Post  roddie Tue Sep 10, 2013 6:31 pm

Hey all, I sent Bernie my article on the sport muffler build, for his Sept. emag. issue. It mentions this concept. Although I haven't "tried it" yet... in theory; it should work... remember to plug the tank-vent. This set-up uses one exhaust pipe (1/4" tube) and one pressure-nipple made out of a sm. flared brass "lead-out' guide (.070" i.d./.078" o.d.)

.049 muffler pressure _049_m10
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Post  pkrankow Tue Sep 10, 2013 6:44 pm

Knock the nail out of a 1/8 inch pop rivet for all kinds of handy uses. I use pop rivets as line guides on scratch built models. The aluminum will hold up to spectra leads for a very long time. Steel and stainless steel are also available. Painted rivets take glue much easier than bare rivets.

There is a 3/32 size that is less easy to find if smaller is needed.

Medium fuel line should fit 1/8 pretty nice and tight, small should fit 3/32 in a similar manner.

Exhaust pressure has been used reliably by others before. I can see no reason it won't work on a smaller model. Now...it might add more complexity than desirable on such a small machine, but that is a different story. Bladders add a lot of complexity and people like them a lot (heck, I am starting to run bladder on my engines!)

Phil
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Post  roddie Tue Sep 10, 2013 7:07 pm

Hey Phil, Thanks for your continued interest in this. I've got to send Bernie some better photos for the article. The prev. one's were lousy. These mufflers are EASY to make... and extremely durable and versatile. Using .22 cal. shell casings as the "exhaust" pipes; "several" can be drilled-out to diff. sz. "inside diameters" for varied degrees of breathing/noise reduction/performance.
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Post  Jason_WI Tue Sep 10, 2013 7:51 pm

@roddie wrote:Using .22 cal. shell casings as the "exhaust" pipes; "several" can be drilled-out to diff. sz. "inside diameters" for varied degrees of breathing/noise reduction/performance.
Let me know where you can find .22LR ammo! Shelves have been empty here for months.
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Post  Cribbs74 Tue Sep 10, 2013 8:59 pm

@Jason_WI wrote:
@roddie wrote:Using .22 cal. shell casings as the "exhaust" pipes; "several" can be drilled-out to diff. sz. "inside diameters" for varied degrees of breathing/noise reduction/performance.
Let me know where you can find .22LR ammo! Shelves have been empty here for months.
I'll keep my eyes open for .22LR if you can find me some .22Short!!!!
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Post  roddie Tue Sep 10, 2013 9:52 pm

Sorry... I don't own any firearms... The "empty shell casings" can be obtained at any local Rod & Gun club/firing range; for this "Cox muffler app."... "Live rounds"... I have no experience with... although; I've heard they're getting increasingly harder to obtain...  

http://www.gunsandammo.com/2013/06/12/ga-perspective-where-to-find-ammo-right-now/
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Post  pkrankow Tue Sep 10, 2013 10:28 pm

The difficulty getting ammo is a large part of why I mentioned pop rivets.  

Pop rivets also come in big sizes, but flaring some brass or aluminum tube is easy.  A brake tubing flare should do the job fine (haven't had need of trying yet).  Carefully driving a ball bearing of about 1.5x diameter into the end of the tube will also bulge the tube in a similar manner. (yes, I have done this, it isn't super pretty)

Phil
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Post  roddie Tue Sep 10, 2013 11:11 pm

@pkrankow wrote:The difficulty getting ammo is a large part of why I mentioned pop rivets.  

Pop rivets also come in big sizes, but flaring some brass or aluminum tube is easy.  A brake tubing flare should do the job fine (haven't had need of trying yet).  Carefully driving a ball bearing of about 1.5x diameter into the end of the tube will also bulge the tube in a similar manner. (yes, I have done this, it isn't super pretty)

Phil
Yes Phil, there are a number of ways you can obtain/make the pipes. The beauty of the .22 cal shell casings is; that you can "drill them out" to different diameters, to allow for varied exhaust flow/restriction. "Ram-sets" used in carpentry (framing) commonly use a .22 cal. round. You could probably find them around a construction site on the ground... or as I stated; at a "shooting range"... They aren't generally "re-loaded"... so if you ask a member at a club; they'll probably give you a handful.
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