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Brampton coil-over damper.

hadronuk

Well Known and Active Website User
VOC Member
Is there any possibility of a coil over front unit for Bramptons?
I have been asked this a few times, but I have never looked into the details. I know there used to be a Monroe(?) unit available. I would certainly like to see how they did it, no point in reinventing the wheel. I think both AVO and I would be concerned about the safety implications of putting suspension loads into parts that were not designed for it. In addition, a guinea pig with Bramptons would be required, the potential sales volume may not be viable, and lastly we would like the dust to settle on the new coil-overs first!
Rob
 

Goffy998

Well Known and Active Website User
VOC Member
Rob
I've fitted a modified IKON unit to my Bramptons & have had no problems with anything breaking, I can send photos if you like. I wasn't happy about the quality of the IKON unit & sent it back once, but it was returned just the same hence looking for something better.
 

hadronuk

Well Known and Active Website User
VOC Member
Rob
I've fitted a modified IKON unit to my Bramptons & have had no problems with anything breaking, I can send photos if you like. I wasn't happy about the quality of the IKON unit & sent it back once, but it was returned just the same hence looking for something better.
Yes please, that would be interesting. Rob
 

ossie

Well Known and Active Website User
VOC Member
I have been asked this a few times, but I have never looked into the details. I know there used to be a Monroe(?) unit available. I would certainly like to see how they did it, no point in reinventing the wheel. I think both AVO and I would be concerned about the safety implications of putting suspension loads into parts that were not designed for it. In addition, a guinea pig with Bramptons would be required, the potential sales volume may not be viable, and lastly we would like the dust to settle on the new coil-overs first!
Rob
look through the photos I put a few to show how the woodhead Monroe unit was fitted to the bramptons on my shadow 50 odd years ago still on there.
OSSIE
 

Robert Watson

Well Known and Active Website User
VOC Member
102-0241_IMG.JPG
I have been asked this a few times, but I have never looked into the details. I know there used to be a Monroe(?) unit available. I would certainly like to see how they did it, no point in reinventing the wheel. I think both AVO and I would be concerned about the safety implications of putting suspension loads into parts that were not designed for it. In addition, a guinea pig with Bramptons would be required, the potential sales volume may not be viable, and lastly we would like the dust to settle on the new coil-overs first!
Rob
I spent some time with Works several years ago and got them to make a dozen front coil over dampers for the Bramptons. They absolutely transformed the front end from pogo stick to motorcycle, however when I went back to order more they declined claiming the lower mount to the headlight lug was not acceptable. I measured the lug and presumed it to be the lowest grade of cast iron and found that it was sufficient in my opinion, plus I made an extra support that hooked over the lower spring mount. They would have none of it. These have now been on the road for at least ten years and not one failure. The unit needs to run "upside down" IE. with the rod pointing down, for the spring to clear everything. Plus of course there needs to be lots of little bushings so that the lower mount can rotate. I think that there maybe some version available from the Thornton distributor as shown in MPH
 

Albervin

Well Known and Active Website User
VOC Member
I have been asked this a few times, but I have never looked into the details. I know there used to be a Monroe(?) unit available. I would certainly like to see how they did it, no point in reinventing the wheel. I think both AVO and I would be concerned about the safety implications of putting suspension loads into parts that were not designed for it. In addition, a guinea pig with Bramptons would be required, the potential sales volume may not be viable, and lastly we would like the dust to settle on the new coil-overs first!
Rob
I have been using a modified Koni with coil over on the front of my B Rapide for 17 years. The bottom mount is probably what has insurance companies worried. It has performed well over all Australian roads which can be worse than going down a coal mine! I used Ikon to get the right Spring strength and I wouldn't swap it for anything! I have recently bought a C Shadow and would seriously contemplate putting the same type of Brampton front end on it.
 

vibrac

Well Known and Active Website User
VOC Member
I thought I would share the bottom fittings of my alphabet twin Brampton damper its one I bought from the USA (I think at the first St Helens NA rally) no longer available but made in California it picks up on the main coil spring anchor point.
I was going to get Bens suspension gurus make some but it proved too costly
BDparts.jpg BDbottom.jpg newbarn 003.jpg
 

greg brillus

Well Known and Active Website User
VOC Member
Has anyone come up with a pair of suitable coil overs that can be used at the rear of an original series "B" where the forward through bolt tube is still in it's original "Un-cut" state.......? I know most over the years have been modified to fit a shock absorber between the spring box's, but I know of some that aren't. I remember Craig had a set on his early "B" and I asked him about them, but never got any reply...........How could anyone forget those bright yellow springs............o_O
 

hadronuk

Well Known and Active Website User
VOC Member
Has anyone come up with a pair of suitable coil overs that can be used at the rear of an original series "B" where the forward through bolt tube is still in it's original "Un-cut" state.......? I know most over the years have been modified to fit a shock absorber between the spring box's, but I know of some that aren't. I remember Craig had a set on his early "B" and I asked him about them, but never got any reply...........How could anyone forget those bright yellow springs............o_O
The basic problem you are up against is that the B series was not designed for a hydraulic damper so the available space is severely limited. Hence the fairly major re-working for the D series that created space for a much longer damper.
I have just had a look through the Armstrong catalogue, and I don't see anything suitable, they are all too long.
I can't see anywhere if the listed minimum length is including or excluding the bump stop. Anyone know?
In the intro, very interestingly it says
"Our SB units are made in two in sizes. SB 3 and SB 4 with nominal stroke lengths of 3" and 4" respectively. (Figs. 2 and 3). For most machines these allow too much movement and stroke restrictors are employed to reduce it in the particular way needed for the individual models. The extended and compressed lengths in the list show this."
So there may be scope for the Armstrong replica suppliers to assist.
 

greg brillus

Well Known and Active Website User
VOC Member
Thanks Rob, I think that's why when I was looking for something to use on the racer, I ended up buying something just for experiment off Ebay which was actually a coilover to suit a "Pit Bike" if you know what they are. It was longer than standard which is what I wanted, had adjustable spring pre load and adjustable rebound on the shocker, all very well made, and only $100 Australian dollars or about 50 pounds sterling. All I need to do then was get some other springs made to get the spring rates I needed. Problem also is trying to find/use something that doesn't look too modern which spoils the look on an old bike. That is why I suggested being able to refit the original spring box's to hide the looks of the coilover. The Thornton unit has a spring diameter of about 63 mm which meant I had to space the original spring box's outward about 8 mm either side, and this set up looks good and works well. The only other idea I had was to use a shroud over the forward end which would hide most of the spring. Just me thinking outside the square if you know what I mean. People seem happy enough to make practical changes to their bikes, but still want it looking standard if possible.
 

Goffy998

Well Known and Active Website User
VOC Member
John
I have a file with some dimensioned drgs. for the Thornton Brampton coil over unit, I can't upload them here.
Go to my website & send me an E mail I will return this + some other photos of similar units.
Paul Goff
 

Oldhaven

Well Known and Active Website User
VOC Member
Here is the Brampton Thornton setup on my B. I posted some pictures during my build, but here are some more recent ones. I had to do a bit of fabrication of mounting points by modifying commercially available clevis components to make it work, since the damper was supplied as a standard rear non coil over configuration. It is internally modified by Dave Molloy to reduce travel for this application. I am not sure if it is still offered. The specifics of the mounting details were suggested by Ted Leno and Dave Molloy, based on Ted's B adaptation, and a drawing was available from Dave that shows one way of doing it. I departed from that a bit because I did not want to mount the bottom head light stays on a pivoting mount, as was suggested. I made an extension from the balance beam pivot. This lowered the headlight by about an inch which has other benefits such as clearance for the speedometer and switch, and I like the slightly different look of the lowered light. My balance beam is not being used since I have the Vincent Speet's brakes and is just there for appearance and as a place to route the cables. I don't see why this mounting could not be done with a functional balance beam. Anyway, it simplified the lower mount by not requiring the headlight stays to cope with the slight rotation of the lower damper mount. the lower clevis mount has to be long enough to clear the fork spring lug through the range of travel. All in all I am quite pleased with the way it works and I find it comfortable and it eases the harsh action a lot on bumpy roads.

I have a Thornton non coil over on the rear also. I did cut the UFM tube to use it, which mortified me since it was unmolested, but that could be easily undone if some future purist want it correct.

damper install 1.JPG IMG_0476.JPG IMG_0478.JPG IMG_0479.JPG
 

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