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Post  Jason_WI on Wed Dec 30, 2020 2:37 am

Doubtful it will work. Probably melt where the exhaust gas exits.

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Post  1/2A Nut on Wed Dec 30, 2020 3:10 am

Looks great perhaps the castor oil will keep it protected.

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Post  fredvon4 on Wed Dec 30, 2020 10:36 am

I would fire up a 049 with the aluminum Car exhaust director/square pipe and use thermo gun to see how hot at peak RPM...I bet every 3d filament has data sheet on cold to hot range capability
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Post  emanuel on Wed Dec 30, 2020 4:48 pm

Nice, maybe this could help3D Printed .020 muffler Cimg6510
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Post  davidll1984 on Wed Dec 30, 2020 8:35 pm

Y want To cast aluminium those custom parts its Not so hard Huh... like Thumbs Up
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Post  GallopingGhostler on Thu Dec 31, 2020 7:41 am

Nice work, Jason. It kind of reminds me of the catalytic converter kits for cars that Midas Muffler of Gallup NM installed on our old 1984 Dodge Aries back in the 1990's, when it got to 100,000 miles and needed replacement. It came with a special rubber hose to connect the air tube to the converter. Over time, it would burn through, was a poor solution at best.

After the dismal problems with Midas in getting this corrected, I took my 1990 Dodge D-150 pickup to an independent shop run by a couple Navajos in Gallup. They welded the air tube (what Midas should have but would not do). They were fast, professional, welds and work would please any inspector. I took my Aries, and can't remember whether they fixed for free or for a small cost, but they welded the air tube, correcting the problem.

Don't know the temperature stability of your muffler material, but it does look very clean, well formed. It would be interesting to see how it performs, and if it will hold up sufficiently over time or not. If it can last say 2 seasons, then the trick may be to simply replace when needed.

But the muffler does have appearance appeal to it. Beers Beer Cheers drunken Happy New Year lol!
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Post  Jason_WI on Sat Jan 02, 2021 2:25 am

Made some tweaks for better fit. Will need to test it out. Material is good to 150C or 302F. So we’ll see it it has a melt down.

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Post  getback on Sat Jan 02, 2021 5:00 am

Looks Good Jason , fingers crossed Happy New Year
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Post  roddie on Sat Jan 02, 2021 10:29 am

Nice work Jason. Thumbs Up Assuming that this material holds up; I wonder if the first rendition's offset header/pipe might be less resistant to flow than the second design, by maybe causing a swirl-scavenging action?

3D Printed .020 muffler Flow_d10

Where one can't plan the indexing of the cylinders' exhaust ports.. and/or the indexing of the mufflers' outlet from engine to engine/model to model.. it could provide for more consistent performance.. if nothing else.

A crazy thought.. but you never know.

EDIT ADD; I see that a starter-spring won't fit with the 2nd design. Might it be worth printing a spacer-ring to fit the top of the crankcase? (for use without a starter-spring..) Were starter-springs prevalent on the Cox .020's? Were/are they available as an accessory?


Last edited by roddie on Sat Jan 02, 2021 11:02 am; edited 1 time in total (Reason for editing : starter-spring omissiom comment)
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Post  OhBee on Sat Jan 02, 2021 3:57 pm

What holds it on?...friction?.....I could go for a babe bee and tee dee .049 version!
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Post  Jason_WI on Sat Jan 02, 2021 5:40 pm

Friction holds it on. I can make a version for the spring starter attached but probably not both. That small of a spacer would break pretty easy.

Cox International and EX have a .049 muffler version on their websites.
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Post  Cribbs74 on Sat Jan 02, 2021 10:52 pm

Is there anything inside that causes a muffling effect or is it more like an exhaust collector? I know the .049 version quiets things down some so perhaps it is just the same. Interesting to see how well it holds up.
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Post  Jason_WI on Sat Jan 02, 2021 11:30 pm

Just a simple shape like the .020 muffler Cox made.

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Post  fredvon4 on Sun Jan 03, 2021 9:49 am

I always liked the twin exhausts on the gilbert engines?

I would like a few .049 twin stack aft facing for some custom TeeDee builds....I guess the fit is cylinder type dependent

wonder if Eastwood powder coat will stay put as a method to change color to red from black
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