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poor quality repop silencers


usefulidiot

Well Known and Active Website User
VOC Member
Does anyone have a list of the brands of the bad quality silencers? I read the page a while back in MPH about the new ones the Spares Co. is making and how they dyno tested a few HP difference. I believe they also said something about a "crispness" to the sound. My bike runs pretty well, standard Rapide motor with concentrics with 160 mains at sea level. Plugs look good. It doesnt sound crisp tho, and i wouldn't mind a few more HP! My silencer has the name "Cambell's" on the underside of the silencer near where it meets the head pipe. Any info is appreciated thanks.
 

Chris Launders

Well Known and Active Website User
VOC Member
There has been considerable discussion of this previously, I think the thread was "comet silencer", however I will tell you my experience.
I had trouble with my twin when I got it, performance wasn't as I expected it to be, tried playing with carbs etc, no joy.
On my test run up a slight incline, about 1/2 mile I could get up to 75 mph, my norvin 90mph, so I took the goldie silencer off the norvin and fitted it to the twin, bingo 90mph. The silencer that was on was an unknown make, spiral baffle type so I bought a straight through absorbtion type from "Bantam John" now sound crisper but not loud at all and still does 90mph up the test run.
 

usefulidiot

Well Known and Active Website User
VOC Member
thanks very much for the response. I believe i found the thread you are talking about and it mentioned avoiding "Cambell's" silencer's specifically.. I think this is enough for me to try the spares Co. one. Thanks.
 

Howard

Well Known and Active Website User
VOC Member
For a crisper note and more hp :-
a. Cut through the Cambell silencer box at the clamp end.
b. Remove internal rusty bits of metal and/or fibre glass.
c. Weld in a length of 1 5/8" exhaust pipe.
d. Weld original two parts of silencer back together.

You will never want another silencer. Instant performance and crisp exhaust note. Not to mention all the new friends you'll make - men in cars with blue lights will stop you, just to tell you what a beautiful sound it makes. :D

H
 

Bill Thomas

Well Known and Active Website User
VOC Member
It's a shame you are so far away, But I am very pleased with my Stainless one from Armours, It has a bigger hole, Straight through !!, Than the Chrome one they do, It's a bit too long on the end pipe, It was not loud till I chopped a few inches off !. You might think about going up a bit on your mainjets ?, cheers Bill.
 

Len Matthews

Well Known and Active Website User
VOC Member
It's a shame you are so far away, But I am very pleased with my Stainless one from Armours, It has a bigger hole, Straight through !!, Than the Chrome one they do, It's a bit too long on the end pipe, It was not loud till I chopped a few inches off !. You might think about going up a bit on your mainjets ?, cheers Bill.
Bill, I had good results with Armours chrome silencer. It was made with a separate mounting bracket with elongated holes which meant it could be bolted in position without straining. The Campbells silencer should be avoided at all costs-far too restrictive and often the baffle breaks loose inside.
 

BigEd

Well Known and Active Website User
VOC Member
VOC Forum Moderator
It's a shame you are so far away, But I am very pleased with my Stainless one from Armours, It has a bigger hole, Straight through !!, Than the Chrome one they do, It's a bit too long on the end pipe, It was not loud till I chopped a few inches off !. You might think about going up a bit on your mainjets ?, cheers Bill.
I have been very happy with Spares Co spiral baffle silencer, performance OK and noise acceptable. (To me at least.:))
I am in the process of a lengthy rebuild (my own fault for riding it so much) and I have a new Armours stainless silencer to try when all the bits get back together. Bill's comment is reassuring as I was wondering about volume of noise from the straight through design. I'll try it unmodified ..... first.
 

usefulidiot

Well Known and Active Website User
VOC Member
lots of great info here thanks guys. I just ordered a silencer from the Spares Co. I'm thinking this might take care of the only complaint ive ever had with the bike as well. That is, at 75 mph...it seems like i am either lugging in 4th or screaming in 3rd. I assumed this was gearing related and was gonna try a 48t rear sprocket but now i'm thinking i might just be missing a few HP with this cruddy silencer. Looking forward to reporting back with results!
 

Jim Richardson

Well Known and Active Website User
VOC Member
I noticed at the weekend, that on a local test run, the Rapide hit 80 easy in 3rd, but would only increase slowly in top.
It may be worth swapping the various silencers around to see if there is any difference.
 

Black Flash

Well Known and Active Website User
VOC Member
I had a Campbell one on a Comet with lowish compression but MKII cam.
The Comet hammered the baffles out on a single 90 miles run with the exhaust note getting "crispier" and speed going up with every mile.
At the end the speed was great but I got send away from the MOT station due to excessive noise and had to scrap it.

Bernd
 

Oldhaven

Well Known and Active Website User
VOC Member
TOGA
I'll be using a never used Toga straight through muffler on the Rapide when spring gets here. What is the verdict on that one? I can see that it has perforated baffles around the large part of the can, but what is behind them and does it last? the chrome looks great.

Ron
 

Howard

Well Known and Active Website User
VOC Member
I think we're in danger of tunnel vision here. The silencer won't suddenly give 6 bhp more than standard, we're not going to boost a standard Rap to 51 bhp. I suspect the new VOCSC silencer will give more or less the claimed 45 bhp, and less well designed silencers will give less power. Don't forget, the power probably comes from less back pressure, that will make it necessary to rejet the carbs to take advantage, and to make sure you don't run too weak.

Jim, I think you're reaching the limit of good acceleration at 80 mph on a Rap if you change up there. Not only is the acceleration starting to tail off, but you drop the engine speed which reduces the power available, if I want good acceleration I stay in third till well into three figures.

http://www.vincent-hrd.co.uk/story.html

H
 

nkt267

Well Known and Active Website User
VOC Member
It's a shame you are so far away, But I am very pleased with my Stainless one from Armours,
I've had one on the Comet for quite a while and am very pleased with it..Same performance as the Toga I had but a little quieter,You could easily hear the Comet(mk2 cams) from over 1/2 mile away:D,,John
 

usefulidiot

Well Known and Active Website User
VOC Member
I am not expecting an increase over stock, i just would like it to run as well as possible and to cruise in 4th at 75 without lugging the engine. I'm guessing that I'll have to move up to at least 180 mains possibly 200's here at sea level if my muffler is currently as restrictive as its reputation. I'm thinking with stock performance restored and possibly 2 teeth up in the back to bring the revs up at my happy cruising speed...I'll get the desired effect. That article was very informative. I knew 3rd and 4th were widely spaced but wow they are very widely spaced.


Sent from my iPhone using Tapatalk
 

usefulidiot

Well Known and Active Website User
VOC Member
Then I hope the silencer changes it because it doesn't like to accelerate in top gear at that speed....downshifting to third is the only way to get it to go anywhere currently


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Albervin

Well Known and Active Website User
VOC Member
When I did the rebuild on my engine last year I bought a new silencer from an Australian supplier because I had not been happy with the current one. When the bike was finished I put the old silencer on for test rides. It was suddenly a lot crisper and I felt I had better throttle response at moderate to higher revs. I discussed this with my friend who assisted in the build and he thought we had timed the cams a lot closer to optimum compared to the way the bike was before the rebuild. I still haven't fitted the new silencer. Oh, another thing, the bike has always run a bit rich but after the rebuild it is noticeably less so to the extent I need full choke on both carbs to start from cold instead of half choke. I have always had a 48T rear sprocket due to the hilly terrain and find the bike will still happily cruise at about 70 mph but 2nd and 3rd gears are much more useful when attacking hills; 1st is only for moving off and hairpins.
What size concentrics are you using?
 

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