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Suspension - please explain.

Marcus Bowden

Well Known and Active Website User
VOC Member
This is what I did in order to get a little more hight above the battery tray to hold a bigger battery, it also saves a third of the weight of the suspension units and they can easily be adjusted (preloading up or down) by grabbing hold of the springs and turning them, also helps when fitting. Next mod will be to cut up some 1/4" aluminium plate making a large diameter hole to fit around the spring claws, leaving a handle 2 to 3" long that can be drilled its whole length into the hole that receives the spring claw. The spring claw is then machined with multi castellations around its periphery. A shaft and ratchet paw slid up the hole with spring. The shaft and ratchet paw have a small lever that can twist shaft/paw 180 degrees to work on the castellations turning the spring units C.W. or A.C.W. to raise or lower suspension, have also been made for racing Vincents with success..
bananaman.

P1040318.jpg


THE 3/4" UPPER SECTION HAS BEEN INSERTED WITH SINTERED BRONZE BUSH as FIRST SET WORN OUT IN LESS THAN 10k miles. So bored out and bushes fitted. Also, ensure that a vent hole is there.

P1040319.jpg

SIDECAR PETIFORD SPRINGS & KONI DAMPER AND AS COMFORTABLE AS SONS SERIES "D"
WITH BAGS OF TRAVEL.

P1070364.jpg
 

timetraveller

Well Known and Active Website User
VOC Member
What is the Greg Brillus mod to the oilite bushes>?
The mod consists of removing the Oilite bushes totally and boring both rear eyes of the lower link by a few thou to take a 32 mm O.D. ball race, two ball races each side so four in total. Some other people have replaced the Oilite bushes with needle roller bearings. If I supply the whole kit which I think gives the best ride, performance etc. then stainless steel concentrics are supplied to replace the original eccentrics which went through the Oilite bushes. Occasionally there has been some misunderstanding in that there are those who think that these concentrics are fundamental to the modification. Not so. The fact that they are concentric is not important. There is one size of concentric if the Oilite bushes are to be used and another if the ball race mod is to be used. It is not the fact that this is a concentric which is important but the geometry of the centre of rotation for the rear of the lower link which changes the geometry. It is the geometry of the lower motion block of the new steering head which effects the change.
The reason that I recommend the Greg type conversion to anyone who can afford to spend the extra money is that when Chris Launders was doing the original test riding we had a perfectly good system consisting of the normal AVO damper and 36 lbs/inch springs with three inches of pre-load. When Chris removed the Oilites and, in his case, replaced them with needle rollers the front of the bike 'pogo sticked ' so badly that we thought that the damper had failed. The reduction in friction led us eventually to going to 45 lbs/inch springs with just over two and a half inches of pre-load and a stiffer damper. Chris weighs about 20 stones/127 kg and it was this that lead me slowly to the understanding that the total mass that one is springing and damping has to be taken into account.
 

greg brillus

Well Known and Active Website User
VOC Member
Don't bother machining the eyes, this would be very expensive, just get them honed at an engine reconditioning shop using their hone they use to resize connecting rods. That way the eyes are kept perfectly in line and the amount removed is a maximum of less than 8 thou on an as new link. Using four of (x 4) 32 x 20 x 7 mm sealed bearings you want not more than 7 tenths of a thou interference, any more and this will distort the bearings and crush them too much. Lightly grease all the parts on assembly to the stem, you will need one or two of the supplied shims on the inside between the large inner washer and the stem lower block to space everything correctly. Use a washer under the heads of the main bolts, this will help align the upper spring cases with the lower halves better........Use a steering damper of your own choice making sure you get full lock to lock travel.............Good luck with it all.
 

Howard

Well Known and Active Website User
VOC Member
Thanks Marcus, always good to see a Vin built to be used. Looks like we've been thinking along similar lines, more travel and height/preload adjustable. I wonder if Pettifords are a bit too strong for a Comet ridden mainly solo. What do the friction dampers do? I can't see how they work with a fully sprung seat.
 

Marcus Bowden

Well Known and Active Website User
VOC Member
Pettiford's did sidecar and solo springs and I think are carried by the VOCSC, mine are sidecar strength, I was thankful I'd left the friction dampers still connected by a link arm to the back of the seat as my hydraulic damper collapsed at the 95 international after leaving the first stage as we did quite a number of miles on rough roads but screwed up the friction that gave a reasonable amount of damping, somehow managed to get a new Koni in Christchurch fitting it in the cattle yard prior to the John Britton interesting talk.
bananaman.
 

Howard

Well Known and Active Website User
VOC Member
Pettiford's did sidecar and solo springs and I think are carried by the VOCSC, mine are sidecar strength, I was thankful I'd left the friction dampers still connected by a link arm to the back of the seat as my hydraulic damper collapsed at the 95 international after leaving the first stage as we did quite a number of miles on rough roads but screwed up the friction that gave a reasonable amount of damping, somehow managed to get a new Koni in Christchurch fitting it in the cattle yard prior to the John Britton interesting talk.
bananaman.
I'm sure I'm being lured into something, but what's the Banana for?
 

stu spalding

Well Known and Active Website User
VOC Member
When Marcus's rev counter was in for repair he stuck a small plastic banana on the cable to judge the RPM.
Cheers. Stu.
 

vibrac

Well Known and Active Website User
VOC Member
Now come on lads use the search button
try post #18 here

PS where has the 'more' button gone in a search page
 

Marcus Bowden

Well Known and Active Website User
VOC Member
Chiquita,, who I finally ended up working for had gone through various name changes, 1968 joining Elders & Fyffes, E & F ship management, Columbia Ship Management, Great White Fleet and Chiquita. The banana on the end of the rev-counter was a give away key fobs as I could never find a Tachometer at the right price and has been there for well over thirty years. When I did find a suitable tacho it was a far more sensible rev range of 6,000 Jaguar style 5" magnetic running anticlockwise that had to run at half engine speed and the Scintilla mag I had to stop using as I couldn't find contact breakers. Last Gossett ignition trigger was slightly different that had a remote magic box so was able to drive the tacho from there also being anticlockwise.
The banana resting on the brake pedal is one the kids put there and is free with bananas as a protective carrying case.
My handle bananaman came about at the FIM rally 1989 in Barcelona on the steps of the Town Hall and someone mentioned that's DV-D ( Dee Vincent-Day) as one does start talking to her and Robin and the visits I had with her dad and how he all ways took the whole litre whisky bottle but only ever cut a few hands of bananas off the stem as that was the only way I could get them off the ship in Southampton otherwise I could be had up for broaching cargo but as the main cargo was in boxes I walked through with clear conscience, to a young girl, not even a teenager at the time stood back pointed her finger at me and said, "So you are the Bananaman" so have used it ever since.
 

Marcus Bowden

Well Known and Active Website User
VOC Member
Why is it that women laugh, grin or smirk when I've mentioned that I worked on a banana boat all my working life. I realise it's the shape of things to come !
FYFFES:: as one disgruntled ship's personnel said going down the gangway after being fired :-(
F*%K
YOUR
FAST
FLEET
of
EFFICIENT
SHIPS
Only company during the war that wasn't ever in a convoy as they were always 20 knot plus ships due to the type of refrigeration. CO2, as it had a critical temperature so had to get into cold water as soon aspossible.
 

Howard

Well Known and Active Website User
VOC Member
This thread is "Suspension - please explain", so please get back onto the topic.
My fault, consider knuckles suitably rapped. :(

Update - I've fitted Girling springs in standard boxes with plastic guides inside the springs. With the eyes screwed fully in the pre load gives about 30% compression that I was looking for. The two most suitable pairs of springs in my collection are either chromed or plastic coated, so I haven't a clue what poundage they are. The good thing is, I have several sets of springs of different rates, so if necessary I can mix and match to find what I'm looking for (or put the bumpy originals back). I borrowed the twist the springs to adjust the ride height idea, thanks Marcus. Next job is bushing the friction damper and seat pivots. What did we do before lockdown? :D
 

Bill Thomas

Well Known and Active Website User
VOC Member
The other day , I cut this out in cardboard, Hope to do it in alloy sheet,
To look like a "D" Oil tank / tool box, Just to fill in the big hole, Or should I just leave it open ?.
 

Attachments

timetraveller

Well Known and Active Website User
VOC Member
Bill, if there is any way you can get to see Mostyn Phelps in Dorset then you should look at the work he does. It is really beautiful and is all done by hand by making a wooden form tool and then panel beating the metal around it. He has made the equivalent of what you are doing for both sides of the bike and it is hard to see that is not original both in style and quality.
 

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