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Repair of crankcases with chopped gearbox.

genedn

Well Known and Active Website User
VOC Member
A question a little off topic. Is it possible and has anyone ever repaired a set of cases with gearbox removed so you can run a stock set up?

Has anyone run this type of unit in a regular frame set up?

Cheers.
 

genedn

Well Known and Active Website User
VOC Member
A question a little off topic. Is it possible and has anyone ever repaired a set of cases with gearbox removed so you can run a stock set up?

Has anyone run this type of unit in a regular frame set up?

Cheers.
I lost the plot and made a new thread. This was a question for another thread.

But I am curious to know if any one has repaired a set of chopped cases. I am also interested to know if anyone has seen a chopped motor with a norton box in a regular RFM and UFM.

Thnx.
 

b'knighted

Well Known and Active Website User
VOC Member
There was, recently offered in auction, a bike purporting to be an enclosed D but built around a chopped engine. As Comets run separate gearboxes in a regular frame setups, we shouldn't be too surprised.
I did read some decades ago, about a set of twin cases which had been destroyed by a tractor running over them being reassembled and recommissioned. It must be possible to weld back a sawn off gearbox case if the bits have been retained.
 

Chris Launders

Well Known and Active Website User
VOC Member
I remember seeing someone racing one with the VMCC I think this is the same one, it had a fibreglass shell over the norton box to give the appearance of an unchopped engine.
If you used a norton box with a commando clutch and turned off the middle row of teeth you could probably run a dynamo as per standard. I'm sure it is possible to build a set of plates to use a RFM with a chopped motor/seperate box and do a really neat job. I'll give it a go if someone wants to donate a ready to run chopped engine and chassis.

Chris.
 

greg brillus

Well Known and Active Website User
VOC Member
I have often been asked at swap meets and bike rallies if I "Know" of any chopped case available to build up a 'Special'. Obviously the answer is NO. I think if some new cases were made that had some extra vertical mounting plates cast into the rear face, to attach some engine to gearbox plates....there would be some demand for it....does anyone out there agree.? As it might be something I will look into at some stage to get the ball rolling. Certainly easier than a full set of original cases, cheers......Greg.
 

A_HRD

Well Known and Active Website User
VOC Member
And Bob Dunn has done a few over the years - welded and machined a gearbox back in place that is. Alas no more, as advancing age and poor health catch-up with him…

Peter B
Bristol, UK.
STILL WANTED: Series A Front Frame
 

roy the mechanic

Well Known and Active Website User
VOC Member
A pal of mine has done just this. It cost a fortune, Ireckon it is more cost effective to spend 3grand and buy a set of repro cases.
 

CollingsBob

Well Known and Active Website User
VOC Member
Mike White repaired a set of "C" shadow cases many years ago by putting a new set of lugs onto the back of the transmission to replace those that had been removed to fit the engine into a featherbed frame..not the same I know, but difficult nonetheless..
 

Pushrod Twin

Well Known and Active Website User
VOC Member
Genedn, you might like to view the post Crank case Inspection. I havent stated it specifically yet, but you will see shortly from the pictures that my design criteria for the Norton gearbox hook up on these chopped cases was in fact to have standard Vincent swing arm position dimension & be structural enough to have a standard RFM & UFM built around them. I have 1 engine destined for an Egli replica frame I have built the other for "standardish" Vincent components.
 

BigEd

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VOC Member
VOC Forum Moderator
I recently heard that Vic Buller had died can anyone confirm this?
Son Graham has written the obituary in the VMCC Journal that arrived today.
I encouraged Vic and Graham to keep campaigning their twin when I was involved with VMCC racing. Back then it was usually the only Vincent twin to be seen at the race meetings.
 

vibrac

Well Known and Active Website User
VOC Member
Yes I remember they had a fine old time with their gearbox eligibility but Vic never missed a trick he had cast iron proof that the mod was done way back in the late fifties and thus was a "period" modification.
although we were often running against Graham, Ben and I always found a welcome in their caravan and Vic used to make many a nod and a wink about what his latest Vincent mod was or how close we were running to the rule book, all in good houmour- He was a great guy very much missed.
 

davidd

Well Known and Active Website User
VOC Member
I got these pictures of engine I think number 1 from somewhere.

Cheers Mark
I took these photos about ten years ago. They are posted in this forum. As I remeber it is a marine engine that the Factory returned to a chassis. I posted the photos because Cycle World did an article on the bike, which was owned by Herb Harris.

David
 

davidd

Well Known and Active Website User
VOC Member
Son Graham has written the obituary in the VMCC Journal that arrived today.
I encouraged Vic and Graham to keep campaigning their twin when I was involved with VMCC racing. Back then it was usually the only Vincent twin to be seen at the race meetings.
Very sorry to hear that. I was always interested in their racing, but it was not covered very often in MPH. I only have two photos of the racers, the twin above and the Comet below:

BullerComet.jpg

David
 

Pushrod Twin

Well Known and Active Website User
VOC Member
That story & pics of #1 is very cool for a whole bunch of reasons.
Mine will end up looking similar with the standard looking primary chain case on that side. I would love to see what is lurking under the chain case of that one. My guess is a single row primary chain & Dominator clutch from that era? And how is the left plate attached to the case?
 

Oldhaven

Well Known and Active Website User
VOC Member
That story & pics of #1 is very cool for a whole bunch of reasons.
Mine will end up looking similar with the standard looking primary chain case on that side. I would love to see what is lurking under the chain case of that one. My guess is a single row primary chain & Dominator clutch from that era? And how is the left plate attached to the case?

I also noticed the somewhat different valve cover and inspection caps, with the larger HRD and no Vincent scroll. Are these prototypes, from earlier models, or are they a one off owner addition?
 

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