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PT: Exhaust Norvin - Exhaust System

Rixon

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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.
 

ericg

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VOC Member
I too prefer the full frame but I guess the builder was invoking the "frameless" element of the original Vincent and giving it his own twist, which surely is the whole purpose of the exercise. If all Specials were the same they wouldn't be special ;)
Sure, and that's why I prefer them to stock machines.
So, I guess one day someone will be adding down tubes to an Egli frame, just to be different?;)
 

Glenliman

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VOC Member
Here's a homebuilt 2" set in 304ss.
Note the 2" diameter goes right to the exhaust nut. I thought that looked a little nicer than the short skinny bit then bulbous out to 2" that is usually seen with a 2" exhaust on a twin.

Glen
 

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Cyborg

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VOC Member
My homemade pipes, some like & some don't, i do. photos of the flanges i made

Those flanges are a good idea. Might have to borrow that if my Comet’s slip fit spring arrangement doesn’t pass the acid test.The flanges must have made the alignment process a whole lot simpler.
 

vibrac

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VOC Member
Not a fan of the flanges almost as fiddly as the fine thread originals I will show a picture of the racing exhaust and stub pipe fixing on the new racer as soon as we get it back from the pipe bender at which point the bike will be cosmetically complete
we want it back from the bender ASAP in case things get worse but the fire has gone out of the project after a winter of work and more than a few pence spent. Our mid April meeting at Silverstone is off and there are no races to run it on, we just cancelled our rolling road tune up. Typical :mad::mad:for once we were actually on target! Hey Ho back to the workshop.
 

Cyborg

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VOC Member
This is what I came up with. Loops for springs have since been added. I would think that using a flange would make life a whole lot simpler. With the flange assembly in place you could easily tack the header on where you want it... remove and weld. With my setup, you have to make sure the header slides in and then play Pop Yoshimura with the oxy propane and rosebud to bend the pipe. I’m looking at it from a slightly different perspective because I have self imposed rules about doing everything in-house. That means factoring in equipment and skill level. Also my project is more of a cake decorating exercise and not a racer, so looks matter more. My spring arrangement has a Mad Max look about it, which I’m not all that thrilled with.
Anyway, please do post a photo or two. Hopefully it’s a moot point and my setup works and it’ll look better when it’s coated.

30247021-0044-4054-BAD5-A2F737100916.jpegC42B5D16-9908-4750-AC3C-46E33D7F360A.jpeg
 

vibrac

Well Known and Active Website User
VOC Member
This is what I came up with. Loops for springs have since been added. I would think that using a flange would make life a whole lot simpler. With the flange assembly in place you could easily tack the header on where you want it... remove and weld. With my setup, you have to make sure the header slides in and then play Pop Yoshimura with the oxy propane and rosebud to bend the pipe. I’m looking at it from a slightly different perspective because I have self imposed rules about doing everything in-house. That means factoring in equipment and skill level. Also my project is more of a cake decorating exercise and not a racer, so looks matter more. My spring arrangement has a Mad Max look about it, which I’m not all that thrilled with.
Anyway, please do post a photo or two. Hopefully it’s a moot point and my setup works and it’ll look better when it’s coated.
Mad max or not its speed of on and off that matters with a racer and you know what? things that are on a racer today often become fashion items tomorrow
incidentally now we have some time I may see about ceramic coating of the pipes if Roy Robertson does it,then it has to be an efficient improvement (and another fashion statement for tomorrows 'bike shed' gang)
 

Cyborg

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VOC Member
I could well be delusional, but praying that once the pipe is on there it will stay on there for a season or two. My current plan is for ceramic coating as well, although I did consider paint briefly. I’ll stick with my springs, but starting to like the idea of anything ( like the flanges) that cuts down on the initial build time. May be false economy and just kicking the can down the road, but it would be nice to have this project wrapped up so I can focus on the next one. No more specials in the foreseeable future. Way too time consuming.

PS. Widelines are prettier.
 

Glenliman

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VOC Member
I have a spare set of MK5 cams and followers in a drawer somewhere. Now and then when looking for something else I see them and think " new project"
Reality says this is a bit like rebuilding a blown up human starting with just a nose.
Fun though!

Glen
 
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Rixon

Well Known and Active Website User
VOC Member
Well I've settled on standard pipes but upswept at the end. Waiting for their arrival from Armours so we can give them a "tweak". Looking at a Goldie silencer -but from who ? The Armours silencer gets mixed reviews. As supplied it seems to have a restrictive baffle fitted. This can be knocked out but then is probably too noisy. Feked do a UK made silencer that is allegedly the same internal construction as the original type but I've yet to find any info on them. Any recommendations ?
 

davidd

Well Known and Active Website User
VOC Member
I agree with Tim on this one. I went through all types of spring held exhausts and ultimately settled on the stock system as the best. This has a lot to do with how much lock wiring you have to do to keep the springs on the pipe. If your spring fractures it cannot be allowed to fall off because if you run over a fractured spring it will almost certainly puncture your rear tire. As a result, you have to run extra lock wiring through the springs to keep it them place during a fracture.

I used 1213 to seal the joint every time I assembled the pipe. I think that the original set-up takes less work and provides a better seal. I don't have a problem getting the nuts on. I rotate the ring backwards until I feel a "click" and then turn it the other way. That works for me most every time. Of course, I only have to do the front, which is probably the easiest to get right.

The racing Gold Star megaphone added 3 BHP to David Tompkins' engine. I have never run a street silencer on a dyno.

David
 

Rixon

Well Known and Active Website User
VOC Member
I think they'd be a bit too noisy for me. They do look great though.

Here's a mock-up of mine with the original exhaust modified and also with a NOS Goldie silencer with BSA fittings.Exhaust 2.jpg

Exhaust 1.jpg
 
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