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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.
 

John Cone

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VOC Member
I ordered a stainless system for my enclosed "D" from Armours. There was no way they would fit around my built in crash bars. They were pretty good, i have sent it back along with my originals for them to copy, hopefully they'll get the front pipes right.
 

Rixon

Well Known and Active Website User
VOC Member
Bought a stainless goldie silencer from Armours, looks good and is of the straight-through absorption type. They make them to fit a Norton and they have much neater mounting points than the original BSA design.

Also got the pipes from Armours, unplated. I'm not quite so impressed, but we will re-weld them ourselves and grind out the excess material (overlap) where the pipes join, before sending them back for chroming.

I've attached a picture of the original pipe for comparison.

20200617_135532 (1500x1466).jpgPipeOverlap (1500x1145).jpg


20200617_135824 (1424x1500).jpg
 

b'knighted

Well Known and Active Website User
VOC Member
I have one of their stainless “goldies” on my big Comet. It has the most anti-social raucous bark and will drown out the feeble sound of Harleys. I love it. The two tapped mounting holes permit the most ridgid bracket I’ve ever had on a Vincent.
 

timetraveller

Well Known and Active Website User
VOC Member
Your second photo shows a fault that I had on a pair of s/s Armours twin pipes. They had not made the hole in the long pipe large enough diameter to let the gas out of the rear pipe, in my case the hole was about 3/4" diameter, In your picture it looks as though they have left a step of perhaps 1/4". I used a solid carbide bur in a die grinder to sort mine out.
 

Bill Thomas

Well Known and Active Website User
VOC Member
Bought a stainless goldie silencer from Armours, looks good and is of the straight-through absorption type. They make them to fit a Norton and they have much neater mounting points than the original BSA design.

Also got the pipes from Armours, unplated. I'm not quite so impressed, but we will re-weld them ourselves and grind out the excess material (overlap) where the pipes join, before sending them back for chroming.

I've attached a picture of the original pipe for comparison.

View attachment 35819View attachment 35820


View attachment 35823
Maybe some of that would be polished out before chroming ?.
 

Rixon

Well Known and Active Website User
VOC Member
Even with polishing I wouldn't be happy with that welding (i'm a fussy bugger!) and as a previous poster has mentioned, the hole in the main pipe isn't cut large enough. Actually it probably is cut large enough but the two pipes aren't aligned correctly. The die grinder will indeed be coming into play. I imagine the original pipes were brazed.

I've no doubt Armours would sort it out if I went back to them (they are amazingly pleasant and 20200617_135513 (1500x911).jpghelpful people) but I do think the product could be a bit better.

Misalignment shown in the picture.
 

John Cone

Well Known and Active Website User
VOC Member
I ordered a stainless system for my enclosed "D" from Armours. There was no way they would fit around my built in crash bars. They were pretty good, i have sent it back along with my originals for them to copy, hopefully they'll get the front pipes right.
I have at long last received my new stainless exhaust from Armours after sending them my originals as patterns. They still took a little fettling but not much and look pretty good. Now i have fitted them i have agreed to send my old ones back to Armours to use a patterns. So anyone wanting a stainless exhaust specifically for an enclosed "D" now knows where to find one., although they should fit B's and C's as well.
 

Glenliman

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VOC Member
Going back to the diameter question, I recall mulling this over before building an exhaust for the 1360. I used 2" on that after plugging the numbers into the calculators.
There are several online calculators for this. The three I used all stated 1 5/8" OD (with .080" wall) as optimum diameter for a 998cc bike using 5800 rpm as max. So yet another thing that Phil Irving had right.

Glen
 

davidd

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VOC Member
The first photo in post 62 shows a weld that looks very hot, but when you look at the second photo you can see what went wrong. The weld was done with no back purge of argon. A weld that has no back purge tends to run hot and it concaves. If you look in the pipe you can see all of the "sugaring" you get when you do not purge the inside of the pipe with argon.

If you back purge, then the weld on the inside should be smooth and silver.

As Glen says, the diameter of the pipe is correct for the cams available from the Factory. The Gold Star testing is a good place to get information on the various straight pipe and megaphone sizes.

David
 

bsaowner

Well Known and Active Website User
VOC Member
I run straight 1 5/8” stock Lightning pipes on my Norvin, tough to beat in looks, sound and simplicity in my opinion.View attachment 35275
Can you or anybody else tell me if the use of the lightning pipes will problematic in terms of starting and general sooth running? These pipes would be my preference for the norvin I’m rebuilding. I’m going to be using 30mm premier concentric, mega cycle cams and a BTH, so nothing radical. I just like the look and also the simplicity of these pipes.
mark
 

vibrac

Well Known and Active Website User
VOC Member
I suppose in the land of the free its an option
It sure ain't here and I for one am happy with that, we live on a crutch rocket road I love the noise but for sure the current speed limits slowly added to this magic road would not be there if the bikes had been quieter as no one would know they were speeding by. Agents of their own demise.
 

Bill Thomas

Well Known and Active Website User
VOC Member
I don't think it makes any difference, But for sound, I don't think you can beat 2" pipes !.
Even makes my Comet sound Fast !,
But I don't want to upset the Public now, The H.D. boys get away with it,
And we have a bloke near me with a Yamaha V twin is very Loud !, A right Pain !,
I would not mind so much if it was Fast !, But it's a load of Slow Junk.
 

timetraveller

Well Known and Active Website User
VOC Member
Years ago when I was production class sprinting and racing the exhaust system was the standard pipes but the 'silencer' was just a piece of straight through pipe welded into a Burgess body. The engine had 9 :1s and MkII cams. Below 2,000 rpm the noise was acceptable. However, open the throttle and it was a bit like tearing a sheet of corrugated iron apart. Never any problem with kick starting though.
 

Cyborg

Well Known and Active Website User
VOC Member
Mark,

Sam has run them for thirty years. If you feel that you can run them it is fine, but you have to stay off the throttle around crowds.

David
Someone should have told my brother that. The local police chief was sitting at his desk and objected to the noise. He sent a squad car out just to track him down.
B252C21B-FA37-4F64-A1C8-9E275A4F28EA.jpeg
 

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