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PT: Exhaust Comet silencer


Mike 40M

Well Known and Active Website User
VOC Member
As snow covers everything, the Comet will stay inside and get some maintenace. Some parts needed from the Spares Company.
I've read a couple of threads, about silencers, but still at a loss. I understand that the Campbell silencer should go to recycling ASAP.
Checked on the webshop and found there is a choise between an absorbtion and a spiral baffle silencer. Please give me some advice on which to choose.
Is their absorbtion type possible to repack easily? Opinions on performance and sound levels?
I'm not especially keen on high noise levels, has already bad hearing inflicted by race bikes.
 

MSVH Y3

Well Known and Active Website User
VOC Member
The spares spiral silencer on my Comet, (8:1) is almost uncomfortably loud. The spiral silencer on my twin decreased my mileage significantly, so my old Kemp silencer went back on the twin
 

Marcus Bowden

Well Known and Active Website User
VOC Member
{{Is their absorption type possible to repack easily? Opinions on performance and sound levels?
I'm not especially keen on high noise levels.}}

I should not think so being an all welded fabrication, I made ten silencers on board ship many years ago now from a redundant S.W. pipe with s/s inlet stub screwed into a bronze flange 1+7/8" x 20 tpi, then the flange into what looks like brass pipe but in fact Yolcalbro (sea water resistant brass) with 20 tpi . With a 50mm diameter perforated s/s tube the length of silencer another bronze flange and a 2"tail pipe silver soldered into end flange. tried various packing material and the s/s pan scowers last the longest , silencer wadding is the quietest and a deeper note, I did hear that testing the various silencers on a dyno the absorption type produced more power (less restrictive !) About twice the weight to a normal silencer, but then made to last a life time , my second hand exhaust pipes I bought in mid 60's still polishes up like new why people like the shiny bling of chrome that eventually rusts I'll never know.
MSVH Y3 you are a bit far away to nip across to my place with the appropriate materials but there are several in you location handy with a daddy of all machines the LATHE.
bananaman.
 

vibrac

Well Known and Active Website User
VOC Member
My last attempt on the Flash to get down to 105 Db for P6 parades at BHR meetings and still look age related I used a 2inch perforated pipe inside a 3inch alloy tube with 1/4" walls. Packing the 1/4 annulus with fibre packing and the ends were turned from solid ally again with 1/4" walls, the idea being that thin walls transmit sounds. I got about 104 Db and it passed.
Nowadays I dont bother with BHR as we cant race the Vincent Comet there so I am dammed if I will bother to parade with them. and I have found that at the events like Kop Hill and Bicester they actually enjoy the noise of a straight through 2" and why not?
 

erik

Well Known and Active Website User
VOC Member
i have bought both silencers from the spares Company.first the straight through ,but it was to loud and then the spiral bafle which is okey.the one which came with the bike was to loud ,too.i have the standart copression Ratio,andit is very important what you have ,because more compression ,more noise.regards Erik
 

Mike 40M

Well Known and Active Website User
VOC Member
Almost a year since I asked for advice.
Bought the spiral baffle one from the spares company.
Finally put it on the Comet yesterday. Not surprisingly had to make some fittings.
I did a 40 miles test run today. Conclusion:
Indeed a lot louder than the Campbell, but top speed increased 20 km/h ( 12Mph ).
Thanks for your advice.
 

Matty

Well Known and Active Website User
VOC Member
I tried the club spares silencer which was very loud and rusted they gave me my money back and also the Armours one which I think was better quality and cheaper but also very loud.
I am presently using an old silencer which the baffles blew out of 25 years ago which is loud but OK.
The loud Armours one went to a friend with a Rapids where it was acceptably quieter, no doubt due to the big engine only having to work half as hard, also the resonances in the twin arrangement would be different.
There
Matty is a lot of stuff on the forum about this some years ago when I was trying to find a good silencer for my comet but no conclusions were reached.
I have owned my Comet since 1956 and it is very reliable and used Summer and Winter though now only about 3000 miles a year.
 

Bill Thomas

Well Known and Active Website User
VOC Member
Yes Matty, I had a gutted Silencer on my Twin, Which was not too bad, But I put in on my Comet,
And it was too loud, Even for me !, The Bikes are not the same. Cheers Bill.
 

Matty

Well Known and Active Website User
VOC Member
Sorry the text got a bit garbled near the end of my last note.
But if any one has found a good quality comparatively cheap , say less than £200 silencer for a Comet I would be most interested.
Matty
 

Bill Thomas

Well Known and Active Website User
VOC Member
Sorry the text got a bit garbled near the end of my last note.
But if any one has found a good quality comparatively cheap , say less than £200 silencer for a Comet I would be most interested.
Matty
Hello Matty, Are you wanting brand new ?.
You say your Bike is an every day Bike, I have an old burgess, With a bit of chrome flaking off,
Don't know how much noise it makes , Have no clue if I have ever used it, But it has Baffles.
If it any good to you, Do you or your friends ever get down near Ringwood,
I can't see me ever using it, But don't want to throw it in the Skip !. Cheers Bill.
 

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Albervin

Well Known and Active Website User
VOC Member
I have found that silencers vary in noise from bike to bike. I took one from my Rapide and put it onto my Vomet and it lasted a day; way too loud. I am now going to try the Shadow silencer on my Rapide, it is an absorption type TOGA. Reason being I am sure the one currently on the Rapide is too restrictive as it almost sounds like a modern bike :)
 

nkt267

Well Known and Active Website User
VOC Member
I have found that silencers vary in noise from bike to bike. I took one from my Rapide and put it onto my Vomet and it lasted a day; way too loud. I am now going to try the Shadow silencer on my Rapide, it is an absorption type TOGA. Reason being I am sure the one currently on the Rapide is too restrictive as it almost sounds like a modern bike :)
I had a Toga on my Comet, Mk2's and a standard piston,Could be heard from nearly a mile away..It's quieter,sort of, with a stainless Armours pipe.
 

Chris Launders

Well Known and Active Website User
VOC Member
I put an absorbtion type on my twin as the spiral baffle one on it slowed it down no end, a friend complained about the performance of his Comet having checked everything else fitted my silencer temporarily, performance restored, but it is LOUD under load whereas on the twin it's not.
 

vibrac

Well Known and Active Website User
VOC Member
I have started to give my new Egli Comet some throttle, boy its powerful, but the Gold star silencer(pattern) does make a racket, but it looks the part perhaps a mute in the end is required anyone tried that?,
 

Chris Launders

Well Known and Active Website User
VOC Member
The pattern Gold Star silencer on my Norvin is much louder than the straight through absorption one on my Shadow so I expect it would be much louder still on a Comet, the straight through one's the same, put it on a Comet and it's painful to follow when under load.
 

Black Flash

Well Known and Active Website User
VOC Member
I have started to give my new Egli Comet some throttle, boy its powerful, but the Gold star silencer(pattern) does make a racket, but it looks the part perhaps a mute in the end is required anyone tried that?,
Hello Vibrac,
I have tried 2 types of mutes on my goldie silencer [amplifier], the first being a VW beetle exhaust end flute. Tamed it a bit, but not enough. On evilbay I then bought these aftermarket mutes for hardly drivables.
This worked very well but somehow restricted the revving on the race cam. If you are not aiming at revving past 6.000 rpm I would give it a try. They will certainly help.
That said, no two engines are the same regarding timing, carburation, compression, cam, etc etc.
But at 14 pounds delivered worth a try rather than ditching a beautiful exhaust.
Bernd
 

peter holmes

Well Known and Active Website User
VOC Member
The absolute best silencer for a Comet is a straight thru pipe!
Its not! well not if you live in a country where kids and adults are allowed to ride around the roads on ponies and horses, and to be honest if you intend to do a decent mileage it can get a little wearing having what sounds like a gatling gun banging away for mile after mile, and these days it probably would not even pass the test for track use, I find my bent and battered club silencer just about acceptable as far as noise balanced with performance goes.
 

Albervin

Well Known and Active Website User
VOC Member
Martyn has been known to terrify children and kangaroos. Anyone riding behind him can claim for industrial deafness.
 

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