Inexpensive exhaust silencers - Page 2 - Honda Foreman Forums : Rubicon, Rincon, Rancher and Recon Forum

Droptime209 · 02-06-2012, 12:32 AM

That's perfect I can't wait to make one for mine! Thanks for the links and write up I almost went and bought one of them production silencers. Id much rather make it my self.

pls1911 · 02-22-2012, 05:00 PM

These homespun silencers won't increase the back pressure over stock mufflers, and should flow MUCH better... so the most restrictive part of the whole system is the stock muffler. In fact you could easily run either of these to replace the stock muffler. so long as a couple of chore boy stainless scrubbie pads were unraveled and LOOSLY inserted in about 6" of final exhaust pipe as a very effetive spark arrester, still flowing better than the stock micro screen.
OCD engineers.... the following excercise is time spent better than watching TV and is admittedly greatly simplified and does not account for a lot of basic fluid dynamics factors, which for this application won't influence the outcome.

Muffler set up: the calculated area of the entrance and exit pipes is 1.48 square inches. The combined calculated area of the 30 perferation holes in the vertical intake stack which represents the initial most restrictive baffle is also 1.48 square inches. Notwithstanding the fact that for a given cross sectional area, a single pipe's flow will far exceed an equivalent area of multiple smaller holes/pipes, for our application, these factors can be ignored.

For the pipe set up: the internal baffle first reduces the 2" ID to 1.5" giving an area of 1.766 square inches. Each baffle pair succesively disrupts air flow with a .625 square inch baffle, and opening a bypass of .625 square inch, effectively returning flow area to 1.766 square inches, though hampered with lots of redirected flow and turbulance.

I have couple of sexy "staggered duals" pipe set ups drawn and will post photos when I get it finished in a couple of days.
Remember that in this all steel application, acoustic attenuation is achieved by transforming the instanteous heat/pressure/sound impulse (BANG!) into a cooler, lower magnitude, and slower, gentle release..(whooosh...). These objectives are accomplished by a 5x to 6x increase in pipe cross sectional area (pi x r squared), full length cooling, and sound and flow disruption via pipe bends and baffles.
Let your imagination guide you!!
The bottom line is that this a cheap way to make your ride much less noisy, and help keep our trails open.
If you ride gently, you'll be grinning from ear to ear, and when you stab the throttle, you'll grin again!

pls1911 · 03-07-2012, 08:48 AM

Attached are follow up photos,
1.) balanced on the rear of a foreman for comparison to the alternate silencer,
2.) mounted on the foreman
3.) another shot of the muffler components ready to mount

Droptime209 · 03-07-2012, 10:50 PM

This will likely be my next mod I'll post some pics when it's done.

pls1911 · 03-13-2012, 10:09 PM

As a fluke, I made up a single straight pipe in place of a the muffler... more reducion in sound than I thought it would be, but of course no where near as quiet as the other configurations.

ninedriver · 03-20-2012, 10:49 AM

I made one of these a while back. I bought a resonator (glass pack) from a local muffler shop and had him bend me a couple of small 90's of pipe. He had a bunch of them as most cars use them inline with their existing muffler to help quiet the car. I welded one 90 on each end of the resonator...one turned down for exhaust and the other directed towards the muffler with a flare on the end. I welded a small 2" section of pipe to the back plate on the stock muffler so the "silencer" could be attached with a muffler clamp. I painted it with rattle can bbq grill paint. Less than $25 and looks/sounds great (quiet).

pls1911 · 03-21-2012, 10:04 AM

The shorty glass pack does work well, though the end product can still give a bit throaty tone under load and is certainly more quiet than stock when simply cruising.
The straight through glass pack is a bit less effective than the baffle type mufflers or silencers to dampen the "black-black-black" report when decellerating or decending a grade using engine braking.
Both approaches offer significant sound reductions over stock mufflers, at a "can't beat it" price.

pls1911 · 04-14-2012, 04:20 PM

Installed a pipe-type silencer (pipe and baffle set up) this afternoon on a Rancher 420.
Sweet ride, nice bike...now whisper quiet.
A happy hunter.

02-06-2012, 12:32 AM	#11 (permalink)
Droptime209 Honda Addict Join Date: Jan 2012 Location: Miami, Florida Posts: 202	That's perfect I can't wait to make one for mine! Thanks for the links and write up I almost went and bought one of them production silencers. Id much rather make it my self. __________________ 2012 Formen Dupli-Color BED ARMOR W/ Kevlar coated F&R racks WARN WINCH Front mounted tow hook. 2" Custome snorkel AP full skid plate w/ stick guards 6 1/2" sterio tube caps (wydglide set up) Coming soon 27X10x12 swap lites all 4 corners

02-22-2012, 05:00 PM	#12 (permalink)
pls1911 Honda Addict Join Date: Dec 2011 Location: DFW Posts: 100	These homespun silencers won't increase the back pressure over stock mufflers, and should flow MUCH better... so the most restrictive part of the whole system is the stock muffler. In fact you could easily run either of these to replace the stock muffler. so long as a couple of chore boy stainless scrubbie pads were unraveled and LOOSLY inserted in about 6" of final exhaust pipe as a very effetive spark arrester, still flowing better than the stock micro screen. OCD engineers.... the following excercise is time spent better than watching TV and is admittedly greatly simplified and does not account for a lot of basic fluid dynamics factors, which for this application won't influence the outcome. Muffler set up: the calculated area of the entrance and exit pipes is 1.48 square inches. The combined calculated area of the 30 perferation holes in the vertical intake stack which represents the initial most restrictive baffle is also 1.48 square inches. Notwithstanding the fact that for a given cross sectional area, a single pipe's flow will far exceed an equivalent area of multiple smaller holes/pipes, for our application, these factors can be ignored. For the pipe set up: the internal baffle first reduces the 2" ID to 1.5" giving an area of 1.766 square inches. Each baffle pair succesively disrupts air flow with a .625 square inch baffle, and opening a bypass of .625 square inch, effectively returning flow area to 1.766 square inches, though hampered with lots of redirected flow and turbulance. I have couple of sexy "staggered duals" pipe set ups drawn and will post photos when I get it finished in a couple of days. Remember that in this all steel application, acoustic attenuation is achieved by transforming the instanteous heat/pressure/sound impulse (*BANG!) into a cooler, lower magnitude, and slower, gentle release..(whooosh...). These objectives are accomplished by a 5x to 6x increase in pipe cross sectional area (pi x r squared), full length cooling, and sound and flow disruption via pipe bends and baffles. Let your imagination guide you!! The bottom line is that this a cheap way to make your ride much less noisy, and help keep our trails open. If you ride gently, you'll be grinning from ear to ear, and when you stab the throttle, you'll grin again! __________________ Paul ------------- 2012 foreman (2) es, power steering Stock wheels and tires 26x10x12 B-Horns when stock tires are replaced Warn xt2500 winch (1) w/Warn mounts Warn 54" snow plow, w/Warn mounts Three different silencers for stock exhaust under $20 (why pay $150 for silent rider?) 1963 Sportster, '55 K Frame. Metal work, good wrench, engineer. Last edited by pls1911; 02-22-2012 at 10:25 PM. Reason: sp*

03-07-2012, 08:48 AM	#13 (permalink)
pls1911 Honda Addict Join Date: Dec 2011 Location: DFW Posts: 100	Follow up silencer configuration photos Attached are follow up photos, 1.) balanced on the rear of a foreman for comparison to the alternate silencer, 2.) mounted on the foreman 3.) another shot of the muffler components ready to mount Attached Thumbnails __________________ Paul ------------- 2012 foreman (2) es, power steering Stock wheels and tires 26x10x12 B-Horns when stock tires are replaced Warn xt2500 winch (1) w/Warn mounts Warn 54" snow plow, w/Warn mounts Three different silencers for stock exhaust under $20 (why pay $150 for silent rider?) 1963 Sportster, '55 K Frame. Metal work, good wrench, engineer.

03-07-2012, 10:50 PM	#14 (permalink)
Droptime209 Honda Addict Join Date: Jan 2012 Location: Miami, Florida Posts: 202	This will likely be my next mod I'll post some pics when it's done. __________________ 2012 Formen Dupli-Color BED ARMOR W/ Kevlar coated F&R racks WARN WINCH Front mounted tow hook. 2" Custome snorkel AP full skid plate w/ stick guards 6 1/2" sterio tube caps (wydglide set up) Coming soon 27X10x12 swap lites all 4 corners

03-13-2012, 10:09 PM	#15 (permalink)
pls1911 Honda Addict Join Date: Dec 2011 Location: DFW Posts: 100	As a fluke, I made up a single straight pipe in place of a the muffler... more reducion in sound than I thought it would be, but of course no where near as quiet as the other configurations. __________________ Paul ------------- 2012 foreman (2) es, power steering Stock wheels and tires 26x10x12 B-Horns when stock tires are replaced Warn xt2500 winch (1) w/Warn mounts Warn 54" snow plow, w/Warn mounts Three different silencers for stock exhaust under $20 (why pay $150 for silent rider?) 1963 Sportster, '55 K Frame. Metal work, good wrench, engineer.

03-20-2012, 10:49 AM	#16 (permalink)
ninedriver Honda Addict Join Date: Nov 2010 Location: North Mississippi Posts: 131	I made one of these a while back. I bought a resonator (glass pack) from a local muffler shop and had him bend me a couple of small 90's of pipe. He had a bunch of them as most cars use them inline with their existing muffler to help quiet the car. I welded one 90 on each end of the resonator...one turned down for exhaust and the other directed towards the muffler with a flare on the end. I welded a small 2" section of pipe to the back plate on the stock muffler so the "silencer" could be attached with a muffler clamp. I painted it with rattle can bbq grill paint. Less than $25 and looks/sounds great (quiet). __________________ Start drinking till you see double and act single... 2006 Foreman ES custom camo wrap painted engine covers, wheels, lower skid plate, and brush guard satin black warn winch grip and thumb throttle warmers

03-21-2012, 10:04 AM	#17 (permalink)
pls1911 Honda Addict Join Date: Dec 2011 Location: DFW Posts: 100	The shorty glass pack does work well, though the end product can still give a bit throaty tone under load and is certainly more quiet than stock when simply cruising. The straight through glass pack is a bit less effective than the baffle type mufflers or silencers to dampen the "black-black-black" report when decellerating or decending a grade using engine braking. Both approaches offer significant sound reductions over stock mufflers, at a "can't beat it" price. __________________ Paul ------------- 2012 foreman (2) es, power steering Stock wheels and tires 26x10x12 B-Horns when stock tires are replaced Warn xt2500 winch (1) w/Warn mounts Warn 54" snow plow, w/Warn mounts Three different silencers for stock exhaust under $20 (why pay $150 for silent rider?) 1963 Sportster, '55 K Frame. Metal work, good wrench, engineer. Last edited by pls1911; 03-31-2012 at 09:47 AM.

04-14-2012, 04:20 PM	#18 (permalink)
pls1911 Honda Addict Join Date: Dec 2011 Location: DFW Posts: 100	Installed a pipe-type silencer (pipe and baffle set up) this afternoon on a Rancher 420. Sweet ride, nice bike...now whisper quiet. A happy hunter. __________________ Paul ------------- 2012 foreman (2) es, power steering Stock wheels and tires 26x10x12 B-Horns when stock tires are replaced Warn xt2500 winch (1) w/Warn mounts Warn 54" snow plow, w/Warn mounts Three different silencers for stock exhaust under $20 (why pay $150 for silent rider?) 1963 Sportster, '55 K Frame. Metal work, good wrench, engineer. Last edited by pls1911; 04-14-2012 at 04:45 PM.

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