Power gains using a tuned exhaust system  
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Power gains using a tuned exhaust system - 1/2/2002 6:48:31 AM   
GUNSHIPGUNNER



Posts: 73
Joined: 12/22/2001
From: Pe El, Wa
Status: offline 		Tuned pipes can provide you with free horsepower. I have systems installed on most of my RC aircraft and have been using these systems for years.

Here are some examples of the RPM increases you can expect with a good tuned exhaust system.

The pipe setup dimensions are given in millimeters measured from the middle of the exhaust port face (from the piston) to the point of the largest diameter where the two cones of the pipe meet, or if a quiet pipe' to the point where the muffled section meets the first cone.

Be sure to follow the curve of the header. I prefer to use a seamstress cloth measuring tape.

When installed and adjusted correctly you can expect a completely stock OS 46 SF with a Macs tuned system to turn a 10x6 APC PROP @ 14,000 RPMs.The pipe length should be about 345 mm as measured in the above description.

Not bad when you consider the fact that this additional power had always been inside your engine just waiting to be unleashed and you didn't have to modify your engine to unleash it.

As I indicated in a previous post raising the exhaust port really helps increase the amount of power the installation of a tuned pipe can provide.

First we tested a stock OS 45 FSR using a 9.5x6 APC prop cut down from a 10X6.

It turned over 15,000 RPMs with the pipe length set at 305mm. Notice how the pipe is 40mm shorter and the RPMs are increased by a least 1,000.

Smaller prop = shorter pipe = higher RPMs.

Next we raised the exhaust port by 1.0 mm.

Now the same OS 45 FSR will spin the same prop at 16,200 RPMs for a net gain of 1,200 RPMs..

Another big advantage of using a good muffled tuned exhaust system is how quiet they are. Much quieter than the stock muffler and you gain power to boot.

BTW: I also love a system called "The Mousse can pipe" and here is the link to the best set of instructions you can find.

http://webpages.charter.net/rcfu/ConstGuide/MCM.html

Don't laugh, this system works and I have 2 planes with it installed on them.


CK

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       Post #: 1

Power gains using a tuned exhaust system - 1/5/2002 4:10:18 AM   
Steve Collins


 

Posts: 2137
Joined: 12/21/2001
From: St.Charles, MO, USA
Status: offline 		An even easier alternative to the conventional tuned pipe/header pipe/silicon connector setup is the bolt-on mufflers available from Performance Specialties called the UltraThrust Muffler. You can bolt one of these on to many engines(the ones PS makes mufflers for) and see an instant 1,000 to 1,500 RPM increase, assuming that you are using a sound engine. I have personally witnessed these gains on a Y.S. .45 side exhaust, a SuperTigre GS .40, and a Supertigre G .91. These mufflers are not cheap but they are top quality.

(in reply to GUNSHIPGUNNER)
       Post #: 2

Re: Power gains using a tuned exhaust system - 1/5/2002 9:24:53 AM   
GUNSHIPGUNNER



Posts: 73
Joined: 12/22/2001
From: Pe El, Wa
Status: offline 		[QUOTE]Originally posted by aptar
An even easier alternative to the conventional tuned pipe/header pipe/silicon connector setup is the bolt-on mufflers available from Performance Specialties called the UltraThrust Muffler. You can bolt one of these on to many engines(the ones PS makes mufflers for) and see an instant 1,000 to 1,500 RPM increase, assuming that you are using a sound engine. [/QUOTE]

When weight or size are the primary considerations PS pipes work well but you can achieve the SAME results with the much less expensive "Mousse Can " system.

Also the Tower line of engines (.46 - .61 - .75) use a muffler similar in design and function to PCs muffler. Tower's mufflers can be ordered separately for $12.95. and produce almost as much power.

The above mufflers or systems are quarter wave or half wave which do not provide the maximum benefit you can achieve with a full wave pipe.

A full wave (or full length) expansion chamber system will provide you with the maximum power gain with the broadest power band.

(in reply to GUNSHIPGUNNER)
       Post #: 3

Power gains using a tuned exhaust system - 1/5/2002 9:58:48 AM   
Steve Collins


 

Posts: 2137
Joined: 12/21/2001
From: St.Charles, MO, USA
Status: offline 		gunshipgunner wrote:

"When weight or size are the primary considerations PS pipes work well but you can achieve the SAME results with the much less expensive "Mousse Can " system."

"Also the Tower line of engines (.46 - .61 - .75) use a muffler similar in design and function to PCs muffler. Tower's mufflers can be ordered separately for $12.95. and produce almost as much power. "



OK now you've gone and done it! Its you and me at 40 paces, same plane, same engine, same prop, same fuel. You with your mousse can or tower muffler and me with my Ultrathrust muffler. Ten laps around the pylons. I know where I am going to lay my money!

I would love to see any test data anyone may have that will back up the mousse can/ tower muffler assertions made by gunshipgunner. You can make all kinds of claims but can you back it up?

(in reply to GUNSHIPGUNNER)
       Post #: 4

Power gains using a tuned exhaust system - 1/5/2002 11:09:53 AM   
GUNSHIPGUNNER



Posts: 73
Joined: 12/22/2001
From: Pe El, Wa
Status: offline 		[QUOTE]Originally posted by aptar
gunshipgunner wrote:



I would love to see any test data anyone may have that will back up the mousse can/ tower muffler assertions made by gunshipgunner. You can make all kinds of claims but can you back it up? [/QUOTE]

All you need to do is quit falling for advertising hype and do a bit of research on exactly how expansion chambers work and why.

Once you understand the engineering behind expansion chambers as used in 2 stroke engines you will see the difference between 1/4 wave - 1/2 wave - and full weave systems.

The laws of physics can't be changed by slick marketing nor do they lie.

(in reply to GUNSHIPGUNNER)
       Post #: 5

mouuse exhaust - 1/5/2002 11:26:42 AM   
bugsiegel



Posts: 568
Joined: 12/30/2001
From: brooklyn, NY, USA
Status: offline 		on a funfly plane i needed a little more umf from my 32sx and went ahead and ordered an exhaust from "leading" exhaust dealer. I have to say I wasn't happy with the finished weight or the performance boost..
I decided to make my own and did it for less than $5.00 after the cost of the header.
On my 32sx I can now spin a 10/4 at 15800 with crisp intant transitoin. the rpm gain was 1500.
the 60 dollar exhaust now sits in the "box full of parts" box.
anyone want to buy it? only one flight on it.

(in reply to GUNSHIPGUNNER)
       Post #: 6

Power gains using a tuned exhaust system - 1/6/2002 7:07:24 AM   
downunder-RCU



Posts: 1125
Joined: 12/27/2001
From: Adelaide, South Australia
Status: offline 		In certain applications a full wave pipe is also used to RESTRICT full throttle revs...it works so well I'd swear my engine just about stops in a dive.
Can anyone guess what the application is??

(in reply to GUNSHIPGUNNER)
       Post #: 7

Extra power from tuned pipes, mufflers - 1/6/2002 9:00:41 PM   
dyerstown


 

Posts: 83
Joined: 12/11/2001
From: Doylestown, PA,
Status: offline 		I would be most interested in good written data on the effects of various pipes, mufflers and props. Mac's Mufflers has some good data published (engine type, RPM), but I cannot seem to find much other. It would be most helpful if manufacturers provided us with this information so we could make intelligent purchasing choices.

Our club requires 92dB at 9' so I would be especially interested in engine, prop, exhaust systems showing:

dB at 9 feet
thrust
RPM

I have contacted a major prop manufacturer and several aftermarket exhaust manufacturers and they have no solution to increased power and meeting our sound requirements.

Any manufacturers out there who will provide us with this info.?

(in reply to GUNSHIPGUNNER)
       Post #: 8

Tuned Mufflers - 1/7/2002 8:49:49 PM   
PilotFrog


 

Posts: 137
Joined: 1/5/2002
From: LA
Status: offline 		Gunship is correct in stating that the tuned mufflers availiable from Tower for their .46 will raise the power output of the O.S. FX, SF, TT .46 and other clones with the same muffler mounting configuration. They might not give "quite" the boost as the PS muffler but are close and less than 1/4 the price. I have found that this is the most bang for the buck on my O S and TT engines. Be sure to check and locktite all mounting and muffler screws.

(in reply to GUNSHIPGUNNER)
       Post #: 9

Vietnam - 1/13/2002 12:00:31 AM   
Captainbob


 

Posts: 190
Joined: 12/24/2001
From: Dayton, OH, USA
Status: offline 		Hey gunship,
I also flew R/C in VietNam, Phan Rang and Saigon to be specific.
How about you??????????

(in reply to GUNSHIPGUNNER)
       Post #: 10

Power gains using a tuned exhaust system - 1/13/2002 4:35:46 AM   
Elwood



Posts: 1512
Joined: 12/11/2001
From: Wayne, NJ,
Status: offline 		How about a dyno run?

_____________________________

Born in the U.S.A.......Not quite as long ago as Art!!!!!!!

(in reply to GUNSHIPGUNNER)
       Post #: 11

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