Stock exhaust on my 95 dyna sucks. I want it louder but not stupid loud. I'm probably going to get the Ultima 40" 1 and 3/4 slash cut drags.
I've never messed with baffles before. Which style keeps the classic sound the most? The long thin ones?
Any thoughts or tips?
Drag pipes never sound good(deep). The bigger the can(muffler) the deeper the sound, as a rule.
If you're looking for the classic sound of drag pipes, put a 1/4" bolt through each pipe about 2" from the end. It will break up reversion and help them run slightly better.
Or a lollypop and you can rotate it to "tune" it.
"Baffles in drag pipes is like trying to fart around a cork."
Best anti-reversion is a cone, any returning wave is constricted and effectively blocked, without affecting the incoming wave.
It won't affect the incoming wave because it has expanded and slowed down and is at a much lower pressure level than the incoming wave/flow.
Quote from: Hossamania on September 20, 2021, 04:54:00 PM
If you're looking for the classic sound of drag pipes, put a 1/4" bolt through each pipe about 2" from the end. It will break up reversion and help them run slightly better.
:agree:.....................what him said^^^^^^^^^^^^^^^^^^^
Make a lollipop from an eye bolt, a washer and a couple of nuts. Tack weld the washer into the eye bolt.
Adjust the angle of the lollipop to just break up reversion that causes exhaust fouling of the inlet fuel charge when the intake and exhaust valves are in overlap.
[attach=0]
I made lollipops on my previous shovel, made a difference for sure.
Maybe I'll try these guys version. Everyone seems happy with them. I guess the cupped thing is the improvement.
https://www.dkcustomproducts.com/choosing-the-right-size-thunder-torque-inserts.htm
If you want cups, buy an automotive freeze plug, ding it with a ball peen hammer, weld it to an eye bolt. Or buy them at Grainger.
(https://www.zoro.com/static/cms/product/large/Z3y8Gufo5oy.JPG)
Anyway, unless someone has dyno results that a cup works better, I call it snake oil. All you're trying to do is stop some of the reversion. The lollipop generally is open to about 45° being enough to slow reversion but not kill exhaust flow.
Quote from: Ohio HD on September 21, 2021, 08:31:12 AM
Make a lollipop from an eye bolt, a washer and a couple of nuts. Tack weld the washer into the eye bolt.
Adjust the angle of the lollipop to just break up reversion that causes exhaust fouling of the inlet fuel charge when the intake and exhaust valves are in overlap.
[attach=0,msg1395392]
Works like a champ. Install in about 2 inches :up:
John
Quote from: jsachs1 on September 21, 2021, 01:48:24 PM
Quote from: Ohio HD on September 21, 2021, 08:31:12 AM
Make a lollipop from an eye bolt, a washer and a couple of nuts. Tack weld the washer into the eye bolt.
Adjust the angle of the lollipop to just break up reversion that causes exhaust fouling of the inlet fuel charge when the intake and exhaust valves are in overlap.
[attach=0,msg1395392]
Works like a champ. Install in about 2 inches :up:
John
Thanks John, good point about 2" in to the pipe. :up:
Always used this on my old Drag Pipe bikes , works great , i agree with snake oil on the cups
Just to clarify.
A lolly pop is a band aide and does not "fix" drag pipes.
It just makes them more tolerable.
It does not fix the huge flat spot that most drag pipes cause.
Reversion runs back up the inner walls of the exhaust pipes not the center,you are creating back pressure that will help with performance to a point as pointed out previously. :potstir:
Everybody rips on drag pipes, but dang I loved mine. Nobody who rode near me did, but I loved them. And they looked cool, which ultimately made me look cool!
Flat spot? What flat spot? A down shift and off we go!
https://youtu.be/KjKUKhHQLHg (https://youtu.be/KjKUKhHQLHg)
Quote from: RTMike on September 22, 2021, 08:41:49 AM
Reversion runs back up the inner walls of the exhaust pipes not the center,you are creating back pressure that will help with performance to a point as pointed out previously. :potstir:
:emoGroan:
Myth!
Air in, air out. The faster you do that and the more volume, power increases (along with corresponding fuel)
Back pressure is detrimental to that. No engine benefits from back pressure.
It's all about the reversion.
Quote from: Ohio HD on September 22, 2021, 09:42:54 AM
https://youtu.be/KjKUKhHQLHg (https://youtu.be/KjKUKhHQLHg)
:up: :up:
Edit in. Love the throwing them in the dumpster. Hurrah :up: :SM:
Quote from: cheech on September 22, 2021, 09:54:56 AM
Quote from: Ohio HD on September 22, 2021, 09:42:54 AM
https://youtu.be/KjKUKhHQLHg (https://youtu.be/KjKUKhHQLHg)
:up: :up:
Edit in. Love the throwing them in the dumpster. Hurrah :up: :SM:
Yeah, that was a nice touch.
Not everyone needs every bit of power at all times , most just want the dyno sheet, but my Drag Bike with open pipes sure dont have any flat spots
Quote from: Ohio HD on September 22, 2021, 09:42:54 AM
https://youtu.be/KjKUKhHQLHg (https://youtu.be/KjKUKhHQLHg)
GREAT video....Thank you for posting that one.
I'm running a 98" Shovel motor with 2" drag pipes. It was a little bit of a struggle but after taking 2 sets of the short baffles the you get from J&P or whoever and cutting them off at the transition from small to big making them into reversion cones and installing them at the inlet and about a foot from the outlet BINGO. There in no perceivable flat spot and it sounds great( to me). I know I can make more HP fine tuning with "good" pipes but I think drag pipes look and sound cool. And I haven't lost too many stoplight challenges either
"short baffles the you get from J&P or whoever and cutting them off at the transition from small to big making them into reversion cones and installing them"
I did this years ago, (nothing more than a tube with some louvers, no packing, cut to about 2" in length) because the cops would stick a baton up the pipe, if it went in all the way you got a ticket, after installation the bike ran way better, still sounded good. The local cops did me a favor.
Shovels and drag pipes go together like rum and coke. Made for each other.
are tapered turbos still around i liked there sound
Quote from: Hossamania on September 23, 2021, 11:29:18 AM
Shovels and drag pipes go together like rum and coke. Made for each other.
Older Sportsters & drag pipes even better IMO. Hooked me at 14 years old.
:agree:
Quote from: Deye76 on September 23, 2021, 02:24:32 PM
Quote from: Hossamania on September 23, 2021, 11:29:18 AM
Shovels and drag pipes go together like rum and coke. Made for each other.
Older Sportsters & drag pipes even better IMO. Hooked me at 14 years old.
:up:
:agree: also.... :chop:
:agree: X3
Quote from: Tynker on September 20, 2021, 03:11:57 PM
Drag pipes never sound good(deep). The bigger the can(muffler) the deeper the sound, as a rule.
I'm at the other end on this, I think drag pipes sound great and the big tubes etc sound like crap. They sound 'flubbery' to me, I like the tight staccato note from 1.75" drags on a stroked shovel.
Quote from: rockman96 on October 10, 2021, 12:53:02 PM
Quote from: Tynker on September 20, 2021, 03:11:57 PM
Drag pipes never sound good(deep). The bigger the can(muffler) the deeper the sound, as a rule.
I'm at the other end on this, I think drag pipes sound great and the big tubes etc sound like crap. They sound 'flubbery' to me, I like the tight staccato note from 1.75" drags on a stroked shovel.
That's a great description...FLUBBERY......
i always thought my pipes were drag but someone said there slash cut but they have baffles. sounds and runs great
Those are not drag pipes. Drag pipes are one diameter from head to tip.
I have installed the cheap bolt in baffles cut down to the first triangle hole. The ones that look like they are made by church key can openers. I don't think they sound the best but improves straight pipe function.
Quote from: david lee on October 11, 2021, 01:08:08 PM
i always thought my pipes were drag but someone said there slash cut but they have baffles. sounds and runs great
Those are "Staggered Dual" pipes with built in mufflers (one piece), likely a very good setup.
Quote from: Burnout on October 17, 2021, 10:35:08 AM
Quote from: david lee on October 11, 2021, 01:08:08 PM
i always thought my pipes were drag but someone said there slash cut but they have baffles. sounds and runs great
Those are "Staggered Dual" pipes with built in mufflers (one piece), likely a very good setup.
had the same pipes since 1984
If you have to run drag pipes, then put some dog balls in them.
I use them in other stuff, but they are intended for drag pipes.
(https://i.imgur.com/7rVMFq2.jpg)