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PT: Exhaust Norvin - Exhaust System

Rixon

Well Known and Active Website User
VOC Member
I'm ready to mock up an exhaust system for the Norvin.

Most examples I've seen (including Eglis) seem to use two into one pipes and a gold star silencer. Modern Eglis also seem to use a 2" exhaust pipe. I've no particular preference on a silencer but it would be nice to use something different. Obviously at this stage the pipes and silencer can be any size or type.

Is a goldie silencer less restrictive than the standard Vincent item? I'm assuming so as the Vincent silencer doesn't seem to be used very often. Are there any other recommendations ? Bike is for road use only so nothing too noisy.
 

Bill Thomas

Well Known and Active Website User
VOC Member
In another thread Howard was told to use a 4" Slot 3/8" wide at the end,
Me being me maybe more slots !!.
Years ago I had to gut a Goldie on my Special, Which was not too bad on the road,
I went SS Standard Vin' Armours a few years ago, And tried the Goldie on my Comet,
WOW, Even I could not have it that loud.
 

Black Flash

Well Known and Active Website User
VOC Member
From my personal experience with a goldie type silencer on a single can say this.
Nice raspy sound on a low compression standard comet,just acceptable. On my TPV 600cc Comet with 10:1 compression it produces an ear bleeding noise and is totally useless.
I am sure even on the countryside I couldn't do 5 miles without being stopped by a copper.
 

Rixon

Well Known and Active Website User
VOC Member
That's interesting. Any idea what make of silencer you've got ?

As far as I can ascertain the Armours Goldie silencer (and in fact all,of their silencers) has a circular plate with a few holes drilled in it (baffle) welded across the pipe. In my opinion this will restrict the gas flow quite seriously but no doubt will make for a quieter exhaust. Knocking this baffle out, which is quite easily done, will result in a straight through silencer with no absorption effect and will be very noisy.

Other manufacturers offer an absorption type Goldie silencer which is claimed to be made as per the original, i.e two perforated tubes with sound deadening material around the circumference.

The problem seems to be getting the correct compromise. I currently have a new Armours Vincent silencer in my possession and can confirm that it's made exactly as described in the first scenario above.
 

Bill Thomas

Well Known and Active Website User
VOC Member
Can't agree, I have 4 S/S Armours they don't have a baffle plate.
I would not have anything that got in the way !.
Maybe it's the Chrome one that does ?, Long time since I have looked at one,
Also Peter showed me one that had been sent back as faulty, Where the bloke tried to knock the baffle out,
And made a Pigs ear of it !!.
Cheers Bill.
 

Rixon

Well Known and Active Website User
VOC Member
So the one the chap sent back obviously did have a baffle plate.

It was Armours that told me that all of their silencers have the same internals and that the baffle can be easily knocked out. This was only last week. As I've mentioned, I have a brand new one sitting here now with a baffle plate. It was delivered three days ago.

Either the stainless ones are different, or perhaps they've changed their manufacturing method since you bought yours. Alternatively could they have made yours without the plate knowing your preference ?

Either way, I've found them a super helpful company to deal with but I'm still undecided about their Goldie silencer construction.

By the way how do you find the noise levels on your stainless silencers ?
 

Bill Thomas

Well Known and Active Website User
VOC Member
Sounds like you are more up to date than me ,
I am talking about Vin' Silencers, Last one was last year, Not a special for me !.
There was a change in staff a few years ago, When the Boss died, I think Peter ?,
I talked mostly with little Peter who retired some years ago,
The ladies in there now are very helpful.
Maybe they are now fitting a baffle to appeal to a new type of customer ??.
I can't see me needing any more :D .
I am pleased with the sound, But I am an old racer, Like my Bikes, Still in race tune !.
And they don't like any baffles .
 

Black Flash

Well Known and Active Website User
VOC Member
My goldie silencer came from armours too. It was an off the shelf item at the time I bought it. At this time I did not know they will make one up with different design if you ask them to.
I inspected it with a torch light.
It has no wadding at all in it. It has a perforated tube going through it. The tube is cut in half in the middle of the silencer and the two ends welded together with an offset of half the inner diameter. So roughly a quarter of the exhaust fumes can go straight through, the rest dissipates through the perforations into the empty can and reenters again further to the end of the silencer again and out through the tailpipe.
I stuffed it with wire wool, put Harley decibel eaters in the back pipe, tried VW bug endpipes, all sorts of things and finally gave up. I couldn't find a way to tame the noise to an acceptable level without choking the engine.
Finally built a silencer myself with an integrated Helmholtz resonator. The engine noise with the bike stationary measured at 4000 rpm dropped from 110+dB to 84dB. Still the engine is louder when under load. But I can ride it two hours without the need of earplugs.
 

BigEd

Well Known and Active Website User
VOC Member
VOC Forum Moderator
So the one the chap sent back obviously did have a baffle plate.

It was Armours that told me that all of their silencers have the same internals and that the baffle can be easily knocked out. This was only last week. As I've mentioned, I have a brand new one sitting here now with a baffle plate. It was delivered three days ago.

Either the stainless ones are different, or perhaps they've changed their manufacturing method since you bought yours. Alternatively could they have made yours without the plate knowing your preference ? .....................
I bought a stainless Armours silencer for my Rapide several years ago and I bought another one last month. Both are straight through, no a baffle.
A bit noisy but not too bad if you are gentle, quite crisp if you are winding it on.
 

timetraveller

Well Known and Active Website User
VOC Member
I have also bought Armours stainless silencers years ago and neither of those had a deflector, just straight through and with a perforated inner tube to hold the 'rockwool', or whatever it is, in place.
 

Rixon

Well Known and Active Website User
VOC Member
Armours state on their website that their silencers do not contain absorption material.

Anyway I'll try and get a picture of the Vincent silencer internals and post it.
 

Bill Thomas

Well Known and Active Website User
VOC Member
That's funny, The one I bought last year was a bit of a Friday Job, Nothing bad, Just the stuffing hanging out !!,
So not a clear hole.
I said to the New Boss, How am I going to get rid of that, Then I said , Oh well I will soon BLAST it away on the first run !.
I know Armours has an " EAR " !! on the Forum, Any chance of a Comment Armours ??.
Who knows maybe it is all change there now ??.
Cheers Bill.
 

BigEd

Well Known and Active Website User
VOC Member
VOC Forum Moderator
That's funny, The one I bought last year was a bit of a Friday Job, Nothing bad, Just the stuffing hanging out !!,
So not a clear hole.
I said to the New Boss, How am I going to get rid of that, Then I said , Oh well I will soon BLAST it away on the first run !.
I know Armours has an " EAR " !! on the Forum, Any chance of a Comment Armours ??.
Who knows maybe it is all change there now ??.
Cheers Bill.
A few years ago on a short holiday break in the New Forest, we were staying in my brother in law's static van not far from Sammy Miller's museum. We were near Armours so we called in one day when we were out for a ride on the Rapide. They had some stainless exhaust pipes in stock so we bought them on impulse. How do we carry them? The old boss offered to deliver them himself to the holiday site. My brother in law brought them back for us the next time he went down for a break. I still haven't got around to fitting the pipes!
 

Rixon

Well Known and Active Website User
VOC Member
As promised a picture down the new Vincent silencer, the "baffle" can be clearly seen.

Spent some more time on Armours website. The stainless steel Goldie silencers are absorption type as per original. The chrome ones are baffled differently. The Vincent stainless silencers aren't listed at the moment.

20200617_140216 (2000x1500).jpg
 

Bill Thomas

Well Known and Active Website User
VOC Member
As Ed will tell you ??, They are a No Frills Firm, Very hands on, Never seen a place like it ,
If ?? you could find it :D :D .
Not really for retail, Mostly POST.
I stand there thinking I would have to spend a weekend Cleaning and painting the place, BUT, That's them and they are a TOP firm to deal with, Not interested in tarting the place up, Just building and selling Exhausts !!.
That Web Site has never shown the VIn' S/S, Silencers, They have been telling me they are going to redo the Web site Since 2006 !!, But I know they don't have time.
 

Rixon

Well Known and Active Website User
VOC Member
Spoke to Armours today. They confirmed that their stainless Vincent silencers are absorption type with a perforated tube and sound deadening material. Their chrome ones have a different construction as per my picture above.
 

BigEd

Well Known and Active Website User
VOC Member
VOC Forum Moderator
As Ed will tell you ??, They are a No Frills Firm, Very hands on, Never seen a place like it ,
If ?? you could find it :D :D .
Not really for retail, Mostly POST.
I stand there thinking I would have to spend a weekend Cleaning and painting the place, BUT, That's them and they are a TOP firm to deal with, Not interested in tarting the place up, Just building and selling Exhausts !!.
That Web Site has never shown the VIn' S/S, Silencers, They have been telling me they are going to redo the Web site Since 2006 !!, But I know they don't have time.
Dear Bill,
You described the place perfectly, I'vehave actually worked in worse places!
The floor might be dirty but the silencers work OK and that is what counts.
When I recently ordered a new stainless silencer I spoke to a lady on the telephone who was most helpful. They seem like good people to deal with.
 

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