Baffles 101 & save $150 to boot!
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Road Warrior
Joined: Dec 2006
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From: The South
Baffles 101 & save $150 to boot!
I have been seeing a few posts regarding baffles lately and I thought I would drop in and put in my 2 cents worth.
I have a carbureted bike (03 Wide Glide) and I did buy and install the Big City Thunder Baffles into my Screamin Eagle II pipes to get the loudest sound I could get. I ride in a congested area and use my pipes before entering an intersection or if I’m not sure a cager sees me, so I want them to be as loud as I can get them. But I do have a suggestion for anybody not ready to drop 150 smackers on the BCTB’s. Here is a way to increase the sound level of your SEII pipes for free.
What I did was re-form the flute area of the stock SEII baffles for a ton more sound, while still maintaining sufficient back pressure to keep good low end torque. The “flow” area of this modification is about half of what the “open flow area” of the BCTB’s is. This modification is about half way between SEII sound level and the BCTB’s sound level but still produces a deep sounding note.
[size=3][font="times new roman"]Here are the SEII baffles and the BCTB’s in a side by side comparison.
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After removing the bolts and nuts holding the baffles in, remove the SEII’s from the bike. (TIP: Buy 2 new muffler clamps from the stealer because the old ones will more than likely break) Using a wooden dowel, the butt end of a hammer, a shovel handle or something on hand to lightly drive the baffle out of the SEII, remove the baffles. They should come out fairly easily, you shouldn’t have to drive them out unless they have been in a long time. Mine had a steel wool like sound absorbing sleeve in them that did not interfere with the removal of the baffles so I just left it inside the pipes when I installed the BCTB’s.
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With the small end of the baffle sitting on a 2x4 to protect it from bending, take a 12 inch long and a 3 inch long 3/8” socket extension and drive it through the center of the baffle “flute” area.
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NOTE: If a louder sound is desired, follow that up by driving the same extension through with a socket on it to increase the through hole diameter. Do this in 2 steps as to not risk splitting the flute. The socket’s outside diameter that I used was .812”. You still have plenty of back pressure and a much louder set of pipes for the cost of a 12” extension. As you can see, the modification is still flows less than the BCTB’s, thus still providing more back pressure than the BCTB’s.
[hr]
[hr]
[hr]
I didn’t do a dyno run and I’m sure you will need to richen the air/fuel after doing this as I did, but it is an easy way to “LOUD UP” your SEII pipes for free.
If anyone has access to a dyno and wants to put mine in to try out first, I will send them to you so long as I get a copy of the dyno results and get my SEII baffles
I have a carbureted bike (03 Wide Glide) and I did buy and install the Big City Thunder Baffles into my Screamin Eagle II pipes to get the loudest sound I could get. I ride in a congested area and use my pipes before entering an intersection or if I’m not sure a cager sees me, so I want them to be as loud as I can get them. But I do have a suggestion for anybody not ready to drop 150 smackers on the BCTB’s. Here is a way to increase the sound level of your SEII pipes for free.
What I did was re-form the flute area of the stock SEII baffles for a ton more sound, while still maintaining sufficient back pressure to keep good low end torque. The “flow” area of this modification is about half of what the “open flow area” of the BCTB’s is. This modification is about half way between SEII sound level and the BCTB’s sound level but still produces a deep sounding note.
[size=3][font="times new roman"]Here are the SEII baffles and the BCTB’s in a side by side comparison.
[hr]
[hr]
[hr]
[hr]
After removing the bolts and nuts holding the baffles in, remove the SEII’s from the bike. (TIP: Buy 2 new muffler clamps from the stealer because the old ones will more than likely break) Using a wooden dowel, the butt end of a hammer, a shovel handle or something on hand to lightly drive the baffle out of the SEII, remove the baffles. They should come out fairly easily, you shouldn’t have to drive them out unless they have been in a long time. Mine had a steel wool like sound absorbing sleeve in them that did not interfere with the removal of the baffles so I just left it inside the pipes when I installed the BCTB’s.
[hr]
With the small end of the baffle sitting on a 2x4 to protect it from bending, take a 12 inch long and a 3 inch long 3/8” socket extension and drive it through the center of the baffle “flute” area.
[hr]
[hr]
[hr]
NOTE: If a louder sound is desired, follow that up by driving the same extension through with a socket on it to increase the through hole diameter. Do this in 2 steps as to not risk splitting the flute. The socket’s outside diameter that I used was .812”. You still have plenty of back pressure and a much louder set of pipes for the cost of a 12” extension. As you can see, the modification is still flows less than the BCTB’s, thus still providing more back pressure than the BCTB’s.
[hr]
[hr]
[hr]
I didn’t do a dyno run and I’m sure you will need to richen the air/fuel after doing this as I did, but it is an easy way to “LOUD UP” your SEII pipes for free.
If anyone has access to a dyno and wants to put mine in to try out first, I will send them to you so long as I get a copy of the dyno results and get my SEII baffles
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