MACS "tuned mufflers" - for real?

Stuka Stunt Main Forum · 11 of 11 known posts recovered

Mike Alimov · Feb 19, 2004 12:19 PM

I've seen (and read about) several people using the MACS "one-piece mufflers", which someone also called "tuned mufflers". You know, those black curved tube mufflers that look like the end of a small carbon tuned pipe. But never mind the look - do they actually have any "tuning" effect, or not?
Has anyone detected any power increase when using these compared to the conventional mufflers (either stock or the tongue-type)? If not power increase, are they at least quieter? If not power increase OR quieter, why use them?
Any feedback is appreciated.

P.S. Specifically, I have Super Tigre .51 and OS LA-46 in mind.

dirtydan · Feb 19, 2004 01:18 PM

RE: MACS#1 source

Mike,

We need to have Scott Riese check in here, as he's The Man on setups based upon the Macs Muffler.

Your 46LA in particular will respond quite nicely to what really is a tuned pipe, one which I believe is a 1/4-wave unit. This combination is so deadly, such a plug-n-play deal that I wrote a Stunt News article which was dedicated to this very setup. Check your back issues, it's all there in one spot.

Dan

captcurt · Feb 19, 2004 01:55 PM

#2 source

They are quite quiet--but not real attractive IMHO.

I ran a Tower 40 (FP40 Clone) in the Scott Riese setup with a Tornado 10-4 3BL and Macs muffler.

It indeed keeps the engine from running away and provided plenty of power as well. I had it flying a 3" stretch twister that was portly at about 43 oz.

Curt

Cary · Feb 19, 2004 02:38 PM

#3 source

We need Scott to chime in here but I have two. One on a LA .40 and the other on a FP.25. They are

1) Quiet

2) I think they weigh the same or a bit less than the stock.

3) In my, non-expert opinion, they do provide more power and a stable run.

Cary

SRiese5283 · Feb 19, 2004 07:44 PM

#4 source

YEP

Scott Riese

Steve Helmick · Feb 19, 2004 08:14 PM

#5 source

For real. The .25>.36 version is 1.75 oz, the .40-.46 2.0 oz. They're pretty quiet, but require high rpm run, so maybe not so mellow as a Big Art tube muffler. Very easy to run, but you need a tach to set launch rpm at around 10k > 10.5k, backed off about 1k from peak. Good fuel economy. When the pipe is working just right, it sounds like it is about to fall off...a funny rattling. Steve

http://www.nwskyraiders.com/index.html

Bud Morrison · Feb 19, 2004 08:28 PM

#6 source

Macs likes to use the word JUST muffler. That way they can sell them to guys who use them on planes in cetain classes that state no tuned pipes

SRiese5283 · Feb 20, 2004 12:54 AM

RE: MACS#7 source

Here's a list of engines that I've tried the Mac's One-piece Muffler

OS-40 FP-S Stock About 1100 runs
OS-35 FP-S Stock About 250 runs
OS-46 LA Stock About 1000 runs
ST-51 Stock About 30 runs
ST-60 Big Jim About 100 runs
ST-60 Stock About 75 runs
OS-25 FP-S Stock About 15 runs
OS-35 Max-S Stock About 45 runs
Tower 40 Stock About 60 runs
McCoy 40 Series 21 Stock About 10 runs (didn't like it)
Fox 40 C/L GMA About 40 runs

The OS-40 FP and the LA-46 have the most research. Then the ST-60 Stock.
Fuel was the main factor in making the engine and pipe work together. 10%nitro and at least 20% All Castor. I ended up with about 4oz of klotz with my all castor 10%nitro. This seemed to work the best for all of the engines.
Reworked FP’s or LA’s will NOT run on the pipe. They have been de-tuned and cannot run the higher RPM’S that you need.
OS-40FP 10,300 RPM’S with a 10x4 Three-blade grish prop
OS-46LA 10,300 RPM’S with an 11.5x4 APC I added one .005 head gasket to the Engine to get better fuel mileage.
ST-51 Ran very well on the pipe BUT not for stunt. I needed more time to work things out.
Dirt Dan wrote an article about my set up a few years ago in Stunt news. Wish I could find it.

Scott Riese

cyberflyer · Feb 20, 2004 10:59 AM

A link to the catalog#8 source

http://www.macspro.com/onepiece.asp

The Cat Whisperer

bkruger · Feb 20, 2004 12:13 PM

RE: MACS#9 source

LAST EDITED ON Feb-20-04 AT 12:40 PM (CDT)

>
>The OS-40 FP and the LA-46 have the most research. Then the
>
>OS-40FP 10,300 RPM’S with a 10x4 Three-blade grish prop
>OS-46LA 10,300 RPM’S with an 11.5x4 APC I added one .005
>head gasket to the Engine to get better fuel mileage.

Scott;

With the unavailability of Grish 3 Blade props, has anyone done any work using the Macs 6650 with the APC 11x4 and 11.5x4 on the FP 40?

>ST-51 Ran very well on the pipe BUT not for stunt. I needed
>more time to work things out.

Interesting. So, how does the ST 51 run with the Macs?

Regards - Bob Kruger

shholt · Feb 20, 2004 06:59 PM

RE: MACS#10 source

Grish props are available again. I ordered a couple of 10X4 three blade props from their web site about a month ago and hadn't heard anything. Package arrived in the mail yesterday. The grey "nylon" from their Voyager series were shipped. I had ordered a couple of additional from their Magnum series and their invoice shows a May 2004 availability for these. It took a while, but the props are here and look good.
Steve

The older I get, the better I used to fly!