Delta Super J

[lotus15racer]

Here is my Super J project. Still need to find a few things but it’s coming along nicely.

[V12]

Great. Love the Super-J too.
What parts do you need?

[lotus15racer]

More than parts what I really need is how to information. I've never actually ran one of these but I want to!

I think the battery is mounted sort of quick change? How many cells? 5? Size of cells best fit? Looks like they get shrink wrapped to a piece of curved plastic? What do the mounts look like?

I need to mount and true tires. Drill press? Glue? What do front rims look like? Solid or drilled?

The ball differential is worn and is a little rough. No where near as smooth as a 1/10 buggy diff. I didn't replace the balls, but the hubs that they run are are worn and rough. Don't know what can be done about that.

Any ideas on the above would be great.

[V12]

Well I like Delta cars (any) and build and collect them. Also I run Super-J project cars.
The battery for the receiver and servos was 5 cells usually. Regarding the size I don´t know the name of the cells, but they are larger diameter and much shorter than AA cells. Sanyo made those cells I think maybe 450 mAh capacity. Could be also up to 600 mAh maybe depending on type and production year.
I used such Sanyo battery back in the days and it seems it survived the many years. Tried to charge now and still holds the voltage.
Reason for 5 cells was to speed up the servos.

The battery was mounted to a brace and fixed to the radio tray by some sort of small body posts.
The Delta drivers used a very thick type of red vinyl tube which was actually intended to protect the receiver. Delta sold such tube.
Now the tube was cutted to a brace which looks the way as you describe the 'curved plastic'.
The battery now was mounted to the brace by tape.

Other drivers made a fibreglass brace which worked also but of course doesn´t look not that nice as the original Delta tube.
But that red tube is very hard to find today.

Yes for trueing tires you could mount them to an old rear axle and run them at a drill press or lathe.
There were also trueing adapters by Delta back in the days.

Front wheels for the Super-J are solid. Drilled are the newer version for the Eagle, but you could use them also for the Super-J.

For the diff it´s a bit difficult. replacing the diff balls might help a bit but the driff ring assemblies/hubs are very hard to find today.
I personally found a few but it´s very rare.

The problem also is, the Delta ball diff is a very early design. Actually released the same year the ball diff was invented by Cecil Schumacher of the UK.
I´m really a big Delta fan and I appreciate everything about what they made. But you can´t compare this old design with modern diffs.
The task was to use parts from the solid rear axle and not do a complete redesign of the Super-J rear end.
So it´s not that perfect as you could do by starting with a blanc white paper.

I personally build a Super-J CK790 Electric runner which uses the same diff. The brushless motors today make much more power and torque than the old nitro motors, that means the diff has to withstand much more load. Well it works somewhat but you often have to rebuild. And it doesn´t run that smooth as I would like but it doesn´t melt or break as some other vintage diffs would do.

[lotus15racer]

Many thanks for the information. I’ll look for the solid fronts. I will try to come up with something like you describe for the battery and mount. Very helpful will get me started. As for the differential I’ll just have to give it a try for now. Thanks again for the post!

[V12]

Looking forward to your build. Please post photos.

[Elkcycles]

The battery for the receiver and servos was 5 cells usually. Regarding the size I don´t know the name of the cells, but they are larger diameter and much shorter than AA cells. Sanyo made those cells I think maybe 450 mAh capacity. Could be also up to 600 mAh maybe depending on type and production year.
I used such Sanyo battery back in the days and it seems it survived the many years. Tried to charge now and still holds the voltage.
Reason for 5 cells was to speed up the servos.

Are you referring to a 2/3A cell?

[Elkcycles]

Additionally, those are available with or without battery tabs preinstalled.

This Ruddog pack is available in the configuration you describe.

[V12]

Similar but not same.
Old cells were 15 mm diameter where those new cells are 17mm.
So for a 5 cell pack there is a difference of 12 mm in length