Another SC Jupiter rebuild

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jowettgeoff
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Re: Another SC Jupiter rebuild

Post by jowettgeoff »

Hi Jack,
Thanks for your interest and offer of support! As the garage temperature is now tolerable, we're getting cracking again. Axle is off to a specialist soon for a check-over, and then the car will be back on 4 wheels for the first time in maybe 30 years. Brakes and steering next, and then the fun starts with the body. Richard is very heavily commited with his new business venture - so Dad will have to take up the slack. No rest for the wicked eh? :roll:

GMcA
David Morris
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Re: Another SC Jupiter rebuild

Post by David Morris »

Hi,

Very intersting thread. You mentioned wanting to lower the rear suspension. Our Javelin, ex Ken Lees, was very low at the rear and bottomed occasionly. What we found was that the rear torsion bar arms had been 'swapped' from side to side. They are apparently 'handed' and putting them back on the right sides restored the ride height on the Javelin, but you might find that reversing the sides could give you the lowered rear height that you want?

All the best with the rebuild,

David
jowettgeoff
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Re: Another SC Jupiter rebuild

Post by jowettgeoff »

Yes David, I tried this a few times with the Javelin for circuit racing, also lowering the front with the torsion bar adjusters. I was never totally convinced it made much difference to the handling, but the car looked quite 'mean', especially on 15" wheels. :twisted:

G McA
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Re: Another SC Jupiter rebuild

Post by Forumadmin »

Lowering a car simply puts the suspension close to its bump stop and hence its 'no suspension' point. Thus, unless the road surface is very smooth, the handling would be worse.

Lowering may also affect the steering geometry and contact point of the tyre. For circuit racing you may be in control and be able to set it up for an advantage as a result of lowering the centre of gravity but I doubt we would get into ground effect territory. :D

A Javelin relies on a lot of body roll to negotiate corners, so lowering the car should also entail stiffening the torsion bars. Some of us even played with anti-roll bars without much success.

I once stiffened the shock absorbers for a race at Donington after practice. Big mistake because at Mcleans corner I went over a bump (pointed out by Damon Hill when he was doing the demo lap for the European Grand Prixthere a fortnight later) and went through the sand trap to gently kiss the tyre wall.
RichardMc
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Re: Another SC Jupiter rebuild

Post by RichardMc »

Progress!!
Sometimes it takes a while to get back into the garage, about 7 years in my case. All it took was a global pandemic. Time to get the SC back on the lift and get the rolling chassis completed. While I have been busy doing other things my assistant (Geoff) had built the front suspension, steering rack and started a gearbox build.
I've taken a few phone pics over the last couple of months but as these are 3Mb each I have uploaded a few compressed versions.

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Chassis on the lift

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Rebuilt Diff

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Front Suspension

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Handbrake mechanism

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Panhard Rod

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Rear Brakes

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Completed Rear Hubs

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Very sad master cylinder

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That needed a service kit!

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Much improved version

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Front Brakes completed

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Fuel tank time.

More to follow in a week or so.
Rich
Keith Clements
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Re: Another SC Jupiter rebuild

Post by Keith Clements »

Well done Richard.
I thought dad was supervisor?
skype = keithaclements ;
RichardMc
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Re: Another SC Jupiter rebuild

Post by RichardMc »

Another day in the garage digging bits out and mending.
First task was a final coat of paint on the fuel tank then a "slosh" treatment to line the inside with sealer. Messy stuff but it looks like it has covered reasonably well.
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Postie turned up with the flexible brake hoses early afternoon but I decided to put that job on hold until next week, it is Friday and one thing I have learned over the years is never start anything on a Friday afternoon if you have plans. I had plans that involved food and wine.

I decided to have a look in the 'bits' box and dug out the throttle peddle.
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Someone had been here before me (and probably before the previous owner)
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Unfortunately whoever had a go at fixing this couldn't weld. Looking at the sate of this I can only assume they had a pet Seagull and a stick welder! Obviously it didn't line up and the pivot holes were oversized. What did I say about Friday jobs?
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At least the massively over complicated cast brass pivot arm is in one piece. No wonder Jowett didn't make any money on these cars, VW can turn out a throttle peddle for about 5p, this must have cost a fortune to make. Yorkshire engineering.
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Next week is finish the brake lines, fit the fuel line and fit the tank, assuming the rubber isolation strip and copper pipe arrives.
Rich
RichardMc
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Re: Another SC Jupiter rebuild

Post by RichardMc »

Six months later..........I'm back. Progress has been made.

I repaired the fuel tank, cleaned, sealed and installed with refurbished straps and rubber isolation tape. It needs and earth strap now.
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All the brake lines, master and pedals are back in place. The actual pedals need to come off again for the bulkhead but if I leave them installed I know where they are.
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New brake cylinders, pipe and liners fitted.
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Refurbished the throttle pedal. It had been messed about with before and had worn the pivot so it needed drilling out and a larger bolt fitting. It won't pass a concourse but it does work nice and smoothly now. You only need two positions anyway.
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To be continued.....
Rich
RichardMc
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Re: Another SC Jupiter rebuild

Post by RichardMc »

As some of you may have seen in the Jowetteer I got the bulkhead out of storage. There was no body fitted to car when it came into my possession many years ago, as a result there are no datum points as such, the front body mounts on the bulkhead had been changed at some point so the only thing we knew to be original was the X bar at the front. With this in mind a plan was hatched. Fit the bulkhead on oak blocks, bolt the X frame to the chassis, level it up and use it as a datum for the rest of the car. Fortunately we had another SC in the garage to copy and take dimensions from for reference. I must also extend my gratitude to Chris Spencer for the very detailed SC rebuild he documented on the RetroRides forum, he took pictures of parts it would have been impossible to see on a complete car and very kindly wrote all the dimensions on masking tape. If you are reading this Chris, I owe you a pint or two.

The bulkhead as it arrived out of storage.
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Wire brush, sanding, power tools galore and a tub of deox we ended up with this.
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A blast of red oxide primer and a test fit to the chassis, felt like progress.
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Bulkhead in place, test fit for the JCS supplied sills, adjusting the rear cross member and checking the diagonals. The replacement sills are a heavier gauge than the ones that dissolved which means they are a bit wider, I could have cut into the bulkhead but that was in surprisingly good condition so we left them slightly proud of where they should be by about 3mm each side. I knew this would be tight with the lower inside of the door but that needs replacing anyway.
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As can be seen here.
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Continues......
Rich
RichardMc
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Re: Another SC Jupiter rebuild

Post by RichardMc »

After much enjoyment getting a Jupiter door to fit with anything that looked like a half decent panel gap, welding a new bottom to the A post and building a bottom hinge from bits we had something that was starting to look a bit like a Jupiter. The B posts were literally just that, a bit of pressed steel that looked like the end of the door. No reference except about 50mm of the old sill, which is a different size to the new one. The only option was to build the locking mechanism and catch plate, clip it to the end of the door, guess where it should go and weld a temporary support to the sill. Shockingly this works and the drivers door opens and closes. Because the chassis is on a single post lift, and the doors are in the middle, it had to come out of the garage to be turned round.
Time to roll out the big guns.
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Interesting fact: If you put a trolley jack exactly in the centre of the chassis X frame, on the 6" square plate that Jowett provided, you can spin the car round and round and round at will with very little effort. This probably won't work if you have an engine fitted, or a boot, or much bodywork. It doesn't take much to amuse a Yorkshireman.

Back in the garage it was simply a case of repeating the process on the other side. At the moment the doors are welded shut, and welded to the floor to keep them where I need them. The tops of the B posts are bolted together to keep it all square while I fit the panels between the doors and the sides of the boot. Basically working backwards from the B posts.
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The rest of December will be taken up with the rear steel panels, boot floor, taking the doors off again to sort the bottom skin and cutting the sills to length. I'm planning on getting the rear aluminium clamshell and boot lid out of storage in January, by which time I should have somewhere to mount it.
Thanks for reading,
Have a great Christmas.
Rich
Chris Spencer
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Re: Another SC Jupiter rebuild

Post by Chris Spencer »

Rich - Happy to help - please don't hesitate if you need any further info / help - I have moved forums though after being plagued by a few trolls on
Retro Rides - can now be found on the below forum (troll free because I'm one of the admin team)

https://brm-forum.org/
27 Long 4 Tourer Oily Rag
37 Jowett 8 HP - In many parts
52 Javelin Std 'Taxi Livery'
52 Javelin Std Patina project
52 Javelin Std Sports project
52 Jupiter SA - Original car - full restoration project
54 Jupiter SA - project - shortly for sale
RichardMc
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Re: Another SC Jupiter rebuild

Post by RichardMc »

Hi Chris, thanks for the offer, I found the brm forum and have been following the OLO build. I know the car very well, the owner was a close family friend.
I set myself the goal of finishing all the steel body parts as far as possible before Christmas, the plan is to collect the aluminium panels in January and check alignment before welding all the seams up. I made a boot floor template to give me something to work from and built it forward from the rear body mounts. Fortunateley the boot lower slam panel and mounting points were complete although they were made of tinfoil and had the structural integrity of a wet tea bag, much welding later I had something that I could build from. The boot side cheeks are original and had survived quite well but they were a bit bent. It's a matching numbers car, so far the only panels I couldn't save are the ones directly behing the B posts.

Wishing you all a very Merry Christmas, more updates in 2021.

Image
Rich
jowettgeoff
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Re: Another SC Jupiter rebuild

Post by jowettgeoff »

Sadly I've had to discourage Rich from further progress for a short while due to people-mixing regulations and possible virus danger. This might be over-reaction, but for the sake of a short interruption of a lengthy project, it's probably best if we follow the Covid rules. Mr and Mrs Mac Snr. will soon be 'jabbed', (as we're in one of the 'Save the Wrinklies' groups), whereupon work will recommence apace! Recent progress has been very satisfying to witness. Soon I will have my car-lift back!!! GM.
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Re: Another SC Jupiter rebuild

Post by Forumadmin »

Hopefully the jab will not stop Jowetttitus.
jowettgeoff
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Re: Another SC Jupiter rebuild

Post by jowettgeoff »

That's incurable... :D
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