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stainless exhaust

nkt267

Well Known and Active Website User
VOC Member
Try Bob Culver , he has the original Vincent tooling.
Nothing against Bob ,but that didn't line up with the mounts either.
Obviously not all Vincents have exactly the same dimensions.
The Armours pipe is 30 thou diamater smaller than the silencer.Grinding off the Goldstar type welded on clamp and using a 'full circle' stainless type cured the problem.John
 

Tnecniv Edipar

Well Known and Active Website User
Non-VOC Member
What did Bob say about the bad fit ?
I haven't used Armours since a bad experience with a set of pipes & silencers I bought off them for a '69 Bonny I was restoring. They were such a bad fit they might as well have been for a different bike but the guy at Armours was belligerent in his denial of responsibility. He said my bike must be a bitsa or something , despite the fact it was 1 previous owner to me and had full history !! They wouldn't even fully refund , only with a 25% restocking charge. So , they lost a customer , permanently !!
 

Len Matthews

Well Known and Active Website User
VOC Member
Bob Culver (as far as I know) does not supply stainless pipes. Years ago, an advertiser in MPH used the phrase "our pipes are guaranteed to fit". A brave boast considering the variations in one engine to another. Re. Armours, a chrome pipe they supplied for a Comet was spot on whereas a set of S/S twin pipes from them was another story!
 

timetraveller

Well Known and Active Website User
VOC Member
I also have had a very bad experience with Armour's pipes. I bought two sets at the same time, complete with silencers, and found that the stub pipe on the long pipe was the same diameter as the pipes themelves so that the short rear pipes would not fit into the stub on the long pipe. They had done the same with the pipes on the front of the silencers. They admitted the fault (they could hardly do otherwise) and found that all the Vin pipes on the shelf were the same. I waited for them to make a new batch and then took the originals back and came home with two more sets in which the sockets were of the correct diameter. They looked alright until I tried to fit them when I found that the rear pipes were much too short and would not reach the stub on the long pipe. Once more a phone call and a trip down to them at which stage, in order to try to help us all, I offered to bring down an engine/gearbox unit so that they could make a jig to ensure that future sets fit. I got a rude reply that they already had a local Vincent owner and did not need help. The third set of pipes fitted but the stubs on the long pipes to take the rear short pipes are too far forwards and they are obviously different from original. However, by far the worst was that when checking them out before fitting I found that both sets had the holes in the long pipes where the short stub is welded on only about 3/4" diameter. Had I fitted them without checking the bike would have been one of those slow ones due to a severly restricted exhaust flow on the rear cylinder. It took several hours with a solid carbide burr to open out the holes to the correct diameter. If any of you have seen a moder computer controlled tube bending machine in action then you will realise that with the correct equipment there is no problem making very intricate shapes repeatedly accurate to within thous. Somehow we need to get a batch of these made. At the same time on a different thread we also need mudgueards that fit and this should be easy for people with the correct equipment. If it is too expensive for any one parts supplier to fund this then perhaps the VOC should put some of its funds into sourcing and getting made parts which fit. The money would almost certainly be better spent than with Stocks and Shares although just now is not a good time to sell those.

With regards to manufacturing tolerances being the reason that some pipes do not fit, (a word this forum will not accept). Try slackening the cylinder head nuts on an assembled engine with no pipes on. Make every thing really loose and then try to move the heads. Each one is constrained by the tops of the cylinder liner and four studs which hold everything together. We are talking total movement here of tens of thous, not more.
 
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derek

Well Known and Active Website User
VOC Member
exhaust pipes

time traveller,
Very interesting, and I whole heartedly agree that action must be taken to manufacture these very simple items (exhaust and mudguards) to an acceptable fit. How can the VOCSC advertise that they have built a complete machine from obtainable spares!!! How about CAMSHAFTS???:(:(
 

Tnecniv Edipar

Well Known and Active Website User
Non-VOC Member
I have contact with a company that does tube manipulation for the Aerospace industry , this should be childs play for them. The only issue is price , but I will talk to them and find out.
 

clevtrev

Well Known and Active Website User
VOC Member
I have contact with a company that does tube manipulation for the Aerospace industry , this should be childs play for them. The only issue is price , but I will talk to them and find out.
Easy enough to bend tube. What is not so easy is to bend tube to fit a multitude of different Vincents out there.
Heads with exhaust ports 1/4" out to the next one, muffs a trifle long or short, cases not at 50 degree angle. Only needs a couple of thou at the port for the silencer to point a a passing car.
 

Tnecniv Edipar

Well Known and Active Website User
Non-VOC Member
Surely if there was that much variation in head location and cylinder angle it would cause bigger problems elswhere , eg: attachment to the UFM ? How would the works have coped with having to hand fit each set of pipes and subsequent fitment of factory supplied spares ?
 
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timetraveller

Well Known and Active Website User
VOC Member
I'm with Tnecniv on this. Consider that the distance from the front port to the exhaust fitting at the rear of the long pipe where it fastens to the footrest plate is more than or about the same as the distance from that fitting to the end of the silencer. Treat the fastening as a pivot and one gets about a 1 : 1 ratio. Two thou at the front gives two thou at the back. If I am wrong then where does the extra leverage come from? As an aside I never use that fastening and in fact on the Armours pipes had to saw it off as it was in the wrong place and wrong angle. Instead I use a nice solid clamp over the silencer to exhaust pipe joint (Vinparts supply such a clamp) and use a little clear silicone mastic in the joint as well. I only realized just how heat resistant this mastic is when I was helping a friend who races a sidecar. During the interval/rebuild which occurs during many sidecar events it was a revelation to see people putting their exhaust pipes back in after cylinder head removal with this normal builders material. At the cylinder head it might only last a few races but at the silencer end it seems to still act as a seal after years of use.
 

Somer

Well Known and Active Website User
VOC Member
My experince has been that the original works pipes are generally a good fit.As a friend said once,you can throw them on from across the room. After markets always seem to be a crap shoot.
 

bmetcalf

Well Known and Active Website User
VOC Member
I am a lucky guy, the pipes I got from Kemps in the '80's, probably made on the Works machine fit perfectly.
 

tonythecat

Well Known and Active Website User
Non-VOC Member
Bob Culver's pipes.

Yesterday I received a set of Bobs pipes, courtesy of Russ. It took me longer to take them out of the packing than to fit them, a perfect fit. Thanks Guys.

Tony
 

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