Does anybody make a quiet silencer for the C15?

[Ceefer Madness]

Hi All,

When I rebuilt my C15 I replaced the Megaphone "silencer" with a "standard" one because it was too loud. I avoided the Armours silencer because I read on-line that it was loud. I got one from Feked instead. It also seems really loud. Both are straight throughs. Does anybody make a silencer that is more like the original spec?

The bike is stock apart from having a lumpy (SS80) cam (because I couldn't find a standard cam that wasn't knackered) and a 1" Concentric Mk1 (to match the 1" but small valve head that I got off Ebay and because AMAL didn't seem to do the Monobloc in Ethanol friendly at the time) so I wouldn't expect it to be this loud (it's not "characterful" it's actually painful!).

The bike runs very nicely and revs quite freely so I don't think the carburation or timing are off.

Any thoughts?

Thanks

[idie]

If you find someone who makes a reasonably quiet silencer let me know. My old Armours silencer appeared to be getting noisy. I bought a Fexed only a slight improvement. Looking in the end it appears that the perforated tube and sound proofing do not extend the length of the silencer.

[AdrianS]

I have the same problem with my B40. Original silencer gave a nice sound but was beyond repair.
One I bought of a seller on fleabay fitted and looked good but was very loud.
Bought one from Armours that didn't fit ( I had to make some new brackets and a small extension pipe) but sounded better. Told Armour of my fitting problems - never got back to me so wouldn't recommend or use again.

[Beesy]

I've read about DB killers. A sort of perforated tube the you can insert on the exhaust somewhere.
Either into the silencer or in the exhaust pipe where it joins the silencer

I have no experience of them so can't offer an opinion but the look like they may offer a solution.

Got my Starfire exhaust from Feked, fitted perfectly and good quality.  It is loud though. I get the occasional disapproving look from passers by. But plenty of approving comments from people too.

I've never peered inside an original silencer, but the one
I have is straight through but has perforated mesh in the fat part. Not sure if that's how they always were.

[Greybeard]

I got one of these to fit in the 'silencer' of my 1949 Matchless 500.
https://www.ebay.co.uk/itm/UNIVERSAL-MOTORBIKE-EXHAUST-SILENCER-INSERT-BAFFLE-1-3-4-x-8-44mm-DRAG-PIPE/252158984657?hash=item3ab5d8c1d1:g:C0kAAOSwkmVgM8~4
The silencer was a replacement of unknown origin fitted well before I got the bike. It had an unpleasantly harsh exhaust note unbefitting a gentleman's mount. Whilst it hasnt made the exhaust eerily quiet, it has certainly got rid of the piercing bark it had and is no longer a source of embarassment. The shorter one isnt as effective, unsuprisingly, as Ive fitted one of those in the high level exhaust of my AJS 350 trials bike. The next plan is to stick a couple of stainless steel pan scourers in the shorty silencer 

Steve

[AdrianS]

I tried a short db killer on the loud B40 silencer - total waste of money ( albeit a couple of quid).

[Rog1]

The idea behind the perforated tube is that it is wrapped with a glass fibre mat. Exhaust pulses (noise) go through the holes in the tube and vibrate the strands, creating friction. The energy absorbed by the strands is dissipated as heat; it's known as an absorption baffle. It has the advantage of being better at reducing high frequency noise, so you end up with a deeper, quieter exhaust note.

Years ago I had a bike with an absorption baffle. It seemed to be getting noisier, so as an experiment I removed the baffle and the little bit of glass fibre that remained on it, and rode round the block. It was no louder without the baffle, so I got some glass fibre and repacked it. The result was a quieter bike. Some sort of soft iron wire is ideal for securing the mat to the baffle.

Here's an example of the glass fibre mat; I haven't bought it myself.
https://www.ebay.co.uk/itm/Exhaust-Silencer-Wadding-340mm-x-550mm-E-Glass-Fibre-Packing-for-Motorcycle-UK/363336662241?hash=item54988d7ce1:g:T9YAAOSw0w5esRT1

[courtney]

It probably goes without saying, but if you use the glass fibre then wear gloves. I made the mistake a few years ago of not doing so. Not so bad when you're using it but later on in the evening it got a bit prickly and quite unbearable.

I've also used an oil free steel wool for exhaust packing. I can't remember if I just used it round the perforated core and then the glass fibre.

[Greybeard]

The idea behind the perforated tube is that it is wrapped with a glass fibre mat. Exhaust pulses (noise) go through the holes in the tube and vibrate the strands, creating friction. The energy absorbed by the strands is dissipated as heat; it's known as an absorption baffle. It has the advantage of being better at reducing high frequency noise, so you end up with a deeper, quieter exhaust n

The 'db killer' isnt an absorption baffle, it simply provides a more tortuous route for the exhaust gas to follow. If you wrap it in matting all youll do is stangle the engine.

Steve

[SIE7RA]

feked make baffles to fit inside of silencers https://www.feked.com/silencer-baffle.html

[AdrianS]

The feked one is the same as the cheap one bought from fleabay. Didn't work

[hoogerbooger]

I have no answer but the same question for my B40 Star.  Hundreds of damned noisy bikers riding past today, so I've just come in to  find I'm not alone on this one. Couple of unseen old singles went past my hedge and they were much quieter than mine.

I had heard that originally the silences may be better.  Mine has caused an quite fruity and graphic argument with the neighbour & I daren't go out during lambing time for risk of having to foster a flock's worth of premature births.

I'll watch out for answers.

[leon bee]

"Unbefitting a gentleman's mount." Yesterday I shared this phrase with a couple of my uncouth motorcycle pals here in the US.

[B Murphy]

I think we all have someone on our streets that doesn't like the noise our bikes make, I have one! and told her where to get off. I can't help with a silencer but a light hearted story might help.

It snowed last night...
8:00 am: I made a snowman.
8:10 - A feminist passed by and asked me why I didn't make a snow woman.
8:15 - So, I made a snow woman.
8:17 - My feminist neighbour complained about the snow woman's voluptuous chest saying it objectified snow women everywhere.
8:20 - The gay couple living nearby threw a hissy fit and moaned it could have been two snow men instead.
8:22 - The transgender man..women...person asked why I didn't just make one snow person with detachable parts.
8:25 - The vegans at the end of the lane complained about the carrot nose, as veggies are food and not to decorate snow figures with.
8:28 - I was being called a racist because the snow couple is white.
8:31 - The middle eastern gent across the road demanded the snow woman be covered up .
8:40 - The Police arrived saying someone had been offended.
8:42 - The feminist neighbour complained again that the broomstick of the snow woman needed to be removed because it depicted women in a domestic role.
8:43 - The council equality officer arrived and threatened me with eviction.
8:45 - TV news crew from BBC showed up. I was asked if I know the difference between snowmen and snow-women? I replied "Snowballs" and am now called a sexist.
9:00 - I was on the News as a suspected terrorist, racist, homophobe sensibility offender, bent on stirring up trouble during difficult weather.
9:10 - I was asked if I have any accomplices. My children were taken by social services.
9:29 - Far left protesters offended by everything marched down the street demanding for me to be arrested.
By noon it all melted and I had a ride on my BSA B31, found a note through the letter box when I got back, "can you be a bit more quite when starting that bike"

Moral:
There is no moral to this story. It is what we have become, all because of snowflakes.

[courtney]

Hahaha!