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Engine basics => Engine set up tips => Topic started by: Dave Moritz on February 06, 2022, 06:07:31 PM

Title: Mystery Muffler
Post by: Dave Moritz on February 06, 2022, 06:07:31 PM
Well, at least it is for me. Can anyone help identify this swap meet acquisition? What a strange design, what with the hollow middle for air flow and what-not. It's mounted on a Veco 19 R/C mill.

Thanks.

Dave Mo...
Title: Re: Mystery Muffler
Post by: Dennis Nunes on February 06, 2022, 06:56:24 PM
Hi Dave,

I believe it's a MACS Venturi Thru-Flow Aluminum Muffler, which of course is no longer manufactured.


Dennis
Title: Re: Mystery Muffler
Post by: Dave Moritz on February 06, 2022, 10:01:46 PM
Thanks, Dennis. Very nicely produced with impeccable welding. Any idea what their performance goals were in producing this?

Dave…
Title: Re: Mystery Muffler
Post by: Dennis Nunes on February 06, 2022, 11:34:50 PM
Any idea what their performance goals were in producing this?

Dave…
I have no idea. I happen to have one that I run on an old ST v60 (no muffler lugs). It's fairly lightweight for its size and works fine.

Dennis
Title: Re: Mystery Muffler
Post by: Jim Carter on February 07, 2022, 10:03:43 AM
Yep!  That's it!!  Here's a pic of one for sale for comparison purposes.  https://www.rcgroups.com/forums/showthread.php?3953019-MACS-Flow-Thru-Muffler-for-K-B-Engine-40-NIB
Title: Re: Mystery Muffler
Post by: Peter in Fairfax, VA on February 07, 2022, 11:51:05 AM
Muffler making is somewhat of a cottage industry.  Some of the top makers included Tatone, Macs and Slimline.  Others got into it as well, including Big Art mufflers in the stunt world.  While the welding and finish on the Macs is surely impressive, the tolerances required for muffler making are not as exacting as, say, P/L fit.  The rights and tooling for Slimline are mow owned by Desert Engines, but they only bought the business to make their own mufflers, not the complete line.

I'd like to buy a Slimline tongue muffler for a Veco .19 our club uses on a trainer, but they are quite rare.  So, probably I will either need to get access to a mill or get a machinist order together.

But, if you want a copy of the Macs for the K&B .40 or a complete K&B .40 R/C, that I have for sale, in quantity.