|
hunter
|
 |
« Reply #1320 on: May 20, 2016, 08:31:41 PM » |
|
Ear plugs.
|
|
|
|
|
Logged
|
I
|
|
|
|
Olds
|
|
« Reply #1321 on: May 20, 2016, 09:04:09 PM » |
|
Re baffles. If I remember correctly, the type of baffles you have, can make the exhaust note harsher.
It's not difficult to make straight through glass wrapped resonator tubes, but you really need to use perforated core tubing rather than wrapping around these louvred baffles. Though I'm not sure where you will find 3/4" perforated tube. Perforated sheet is easy to get hold of so rolling your own wouldn't be hard.
|
|
|
|
« Last Edit: May 20, 2016, 09:14:02 PM by Olds »
|
Logged
|
Getting older but no wiser! Just using bigger hammers.
The answer to most problems, fire and lots of it.
|
|
|
Manky Monkey
Administrator
Hero Member
Karma: 264
Posts: 55102
|
|
« Reply #1322 on: May 20, 2016, 09:18:26 PM » |
|
Yeah, Andy, (Dslam), pointed out this evening that it really needs a silencer to provide some resonance to alter the tone & make it deeper. I think I'll get new pipes made up from a single length of stainless, which will solve the current problem of the pipe fracturing where I've welded several pre-formed bends together then sanded the welds down flush. Then I can experiment with baffling & if that doesn't work, I can splice a pair of silencers into the middle of the new pipes.
These would work & are about as small diameter as I'm likely to find, but I appreciate the square cut ends might not look pretty -but then, they might suit the long straight pipes? I'd have to cut a slice out of their length & weld the 2 together with a flat plate between them to get the inlets & outlets close enough together, so they'd be a single piece but separate silencers inside. Not sure what that would do to the resonance.
|
|
|
|
« Last Edit: May 21, 2016, 05:22:10 PM by Manky Monkey »
|
Logged
|
On the last freedom moped out of Nowhere City.
|
|
|
Manky Monkey
Administrator
Hero Member
Karma: 264
Posts: 55102
|
|
« Reply #1323 on: May 20, 2016, 09:28:58 PM » |
|
Here's the brass twiddlers fitted to an Amal carb. Taken from the manufacturer's website http://www.thefactorymetalworks.com/ |
|
|
|
|
Logged
|
On the last freedom moped out of Nowhere City.
|
|
|
|
minimutly
|
|
« Reply #1324 on: May 20, 2016, 10:53:53 PM » |
|
Stainless as a silencer is bad news, it will tend to produce a "tinny" note. Its not unusual to use a MS box wrapped in stainless. Those plug in baffles are both restrictive and poor silencers.
|
|
|
|
|
Logged
|
|
|
|
|
Olds
|
|
« Reply #1325 on: May 21, 2016, 05:26:13 AM » |
|
Universal stubby's. 45mm inlet and outlet unfortunately but you can get reducers or have the pipes made in 1 3/4"
|
|
|
|
|
Logged
|
Getting older but no wiser! Just using bigger hammers.
The answer to most problems, fire and lots of it.
|
|
|
|
Olds
|
|
« Reply #1326 on: May 21, 2016, 05:40:58 AM » |
|
|
|
|
|
|
Logged
|
Getting older but no wiser! Just using bigger hammers.
The answer to most problems, fire and lots of it.
|
|
|
Manky Monkey
Administrator
Hero Member
Karma: 264
Posts: 55102
|
|
« Reply #1327 on: May 21, 2016, 05:23:57 PM » |
|
Sorted  |
|
|
|
|
Logged
|
On the last freedom moped out of Nowhere City.
|
|
|
Manky Monkey
Administrator
Hero Member
Karma: 264
Posts: 55102
|
|
« Reply #1328 on: May 22, 2016, 05:04:38 PM » |
|
Stolen from Chevy Rick's photos of this weekend's Kempton bike jumble. A Panther with apparently straight through, long high level pipes. Wonder how it sounded?
|
|
|
|
|
Logged
|
On the last freedom moped out of Nowhere City.
|
|
|
|
Tony oily bike
|
|
« Reply #1329 on: May 24, 2016, 10:42:06 AM » |
|
As Sir Manky is looking at his XS650's zort system, and the noise it makes etc, thought I'd throw a few pics of high level pipes just to help get the design juices flowing.
Although these are flat-tracker style bikes, the above-engine-case systems with silencers give a bit of an idea of what's possible.
|
|
|
|
|
Logged
|
There's nowt as light as a hole, so add lightness.
Our lady of blessed acceleration, don't fail me now! - Elwood Blues
Nitro doesn't add power, it multiplies it! Bob Loux, running 10.07 secs @138mph on a 650 normally aspirated Triumph drag bike in 1965!
"Incontinence Hotline" - please hold.
|
|
|
|
Tony oily bike
|
|
« Reply #1330 on: May 24, 2016, 10:43:07 AM » |
|
Similar style
|
|
|
|
|
Logged
|
There's nowt as light as a hole, so add lightness.
Our lady of blessed acceleration, don't fail me now! - Elwood Blues
Nitro doesn't add power, it multiplies it! Bob Loux, running 10.07 secs @138mph on a 650 normally aspirated Triumph drag bike in 1965!
"Incontinence Hotline" - please hold.
|
|
|
|
Tony oily bike
|
|
« Reply #1331 on: May 24, 2016, 10:51:04 AM » |
|
Have seen and heard the 'stubby' on a Triumph twin, and then heard the same bike when replaced with the slash-cut, and in my opinion (and the owner's too), the slash cut was waaaaay better. http://www.ebay.co.uk/itm/VIPER-UNIVERSAL-SILENCER-15-SLASH-CUT-CHROME-/161825781513?hash=item25ad917709:g:bC8AAOSwuTxV9mk8Just out of interest, one of the most 'tunable' silencers around are those made by the American company Supertrapp where there are a selection of end baffles/discs that can be added.  |
|
|
|
« Last Edit: May 24, 2016, 11:00:34 AM by Tony oily bike »
|
Logged
|
There's nowt as light as a hole, so add lightness.
Our lady of blessed acceleration, don't fail me now! - Elwood Blues
Nitro doesn't add power, it multiplies it! Bob Loux, running 10.07 secs @138mph on a 650 normally aspirated Triumph drag bike in 1965!
"Incontinence Hotline" - please hold.
|
|
|
Manky Monkey
Administrator
Hero Member
Karma: 264
Posts: 55102
|
|
« Reply #1332 on: May 24, 2016, 12:27:34 PM » |
|
Have you seen the price of Supertrapps Tone!  |
|
|
|
|
Logged
|
On the last freedom moped out of Nowhere City.
|
|
|
|
Tony oily bike
|
|
« Reply #1333 on: May 24, 2016, 12:42:45 PM » |
|
Have you seen the price of Supertrapps Tone! I have indeedy, and they ain't cheap............  (but they are good), and unfortunately the chances of finding a second-hand matched pair on an auction site are pretty slim...... sigh |
|
|
|
|
Logged
|
There's nowt as light as a hole, so add lightness.
Our lady of blessed acceleration, don't fail me now! - Elwood Blues
Nitro doesn't add power, it multiplies it! Bob Loux, running 10.07 secs @138mph on a 650 normally aspirated Triumph drag bike in 1965!
"Incontinence Hotline" - please hold.
|
|
|
Manky Monkey
Administrator
Hero Member
Karma: 264
Posts: 55102
|
|
« Reply #1334 on: May 24, 2016, 03:07:25 PM » |
|
 no end cans for me -they'd simply ruin the lines of the bike dahling. Has to be something up front above the engine casings, to leave the long tailpipes, or I'll just run long open pipes & learn to live with the loudness. I do wonder if empty pipes would actually be quieter
|
|
|
|
|
Logged
|
On the last freedom moped out of Nowhere City.
|
|
|
|
