|
#1
|
|||
|
|||
Kyosho Scorpion 4x4 build project
As the title suggests this is a build project of a Kyosho Scorpion conversion to 4 wheel drive .
Aims 1 period possible with 1980's tech/parts 2 to keep it looking like a Scorpion cosmetically 3 to be functional ,not a shelf Queen The plan is to use chain drive from the rear to the front , Optima front steering hubs and a front diff . I've started by making a replacement for the front steering hub king pin , as standard the king pin passes through the steering hub but if fitting a driven hub I had to think of an alternative system . My solution is to have a king pin under the hub that passes through twin flanged bearings fitted it the pin that passes through the front suspension arm . The first issue I've come across is that with a wheel fitted to test it's increased the front track to make the front wheel 10mm wider both sides than the back so I'm going to have to find ways to bring it in again , I think I can move each wheel 6mm inward so I've got another 4mm to go . Here's pictures of the king pin arrangement and Optima steering hub installed . this is a comparison of the stock steering hub and king pin next to the Optima hub and king pin . hub installed and view from front showing increased track . there's surprisingly little slop ,at least comparable if not better than the stock king pin setup , hopefully the tiny flanged bearings don't wear out too quickly. |
#2
|
|||
|
|||
Just made the new adjustable front suspension hanger , at the moment the servo saver fouls on the joining sleeve but that's kind of a mute point as it won't be there when I'm done as the front gearbox will be there ,I also modified the king pins to bring them in a bit ,overall it's about 5 or 6 mm narrower ,I've ordered some Optima front axles as well as they were recommended on another forum to help reduce the width . Sorry about the photo quality ,kids are on the PC so I can't use the digital camera and download decent pictures ,these were done from my tablet but you get the idea.
|
#3
|
|||
|
|||
Nice project dude....looking forward to more info etc
__________________
Life is a fantasy but its beauty is real |
#4
|
|||
|
|||
|
#5
|
|||
|
|||
Next instalment.
i got the chance to make another attempt at the extended rear lay shaft and this time it all went smoothly yay ! The shaft is over long right now but can be shortened to the correct length when i decide where the chain will run . The extended end for the sprocket has to be 4mm as that's the internal size of the bearing in the gearbox , the internal diameter of the sprocket is 6mm so I had to make a sleeve to fit between , the shaft may have to extend further than i'd like from the gearbox and if that's the way I go then I'll make up a support with a bearing in that can be secured to the side of the gearbox with either the diff cover plate screws or the motor support screws , again i might find a way to have it flush with the side of the gearbox ,in witch case i can shorted the shaft and sleeve . You might notice if you have a keen eye that there's no groove to fit the circlip that retains the shaft on the motor side of the gearbox , this function will be performed by the sleeve that goes between the shaft and sprocket , the sleeve is extended to butt up against the bearing in the gearbox , i did this because in was worried that a 4mm shaft extended that far might bend and having a groove cut into it would further reduce the diameter , the sleeve also helps to support the shaft and prevent it flexing . |
#6
|
|||
|
|||
|
#7
|
||||
|
||||
Looking good , things are happening
😊 /iso |
#8
|
|||
|
|||
|
#9
|
|||
|
|||
Today i made up the mounting plate for the front gearbox , this replaces the original chassis plate that would support the servo saver and the cross bar that goes between chassis rails , it all fits in pretty well , i'll have to chop some of the front of the plastic tub to give clearance for the gearbox and for the chain but it should be possible to leave the battery compartment untouched .
|
#10
|
|||
|
|||
I love this stuff!
Nothing like some properly executed, innovative engineering to sooth the soul. I dream of having the tools and knowledge to turn something old school back in to a competitive beast again. |
#11
|
|||
|
|||
Thanks , i very much doubt it will be competitive in a modern race , I'd settle for a successful conversion and fun to drive.
|
#12
|
|||
|
|||
Great stuff. Will be following!
|
#13
|
|||
|
|||
Agree the old vintage stuff will never compete with the modern racers. I would love to see a race series for vintage prototypes just to showcase everyone's engineering developments. I reckon it could be awesome fun....
|
#14
|
|||
|
|||
That sounds like a lot of fun but i think the qualifying rules might be complicated .
|
#15
|
|||
|
|||
Did a bit more cutting of the tub , its still a little rough round the edges but i think i have the clearance i need for the chain , i also cut the front under-plate so the gearbox fits into it and lowers the gearbox the 3 mm i needed , i might just get away without making new shock towers as there looks like enough clearance for the drive shafts , I'm going to have to extend the shafts about 10 mm but that's easy enough . One other thing on the list is to make up some guide pulleys and a tensioner .
|
#16
|
|||
|
|||
|
#17
|
||||
|
||||
Rc porn, stunning
__________________
www.kamtec.co.uk www.fibre-lyte.co.uk answer-rc.com/uk/en/ Answer UK team driver Designer of the Lazer ZX/ZXR carbon fibre tub chassis Designer of the Lazer ZXRS |
#18
|
|||
|
|||
Thanks , ive got to sort out the steering next .......should be interesting .
|
#19
|
|||
|
|||
|
#20
|
|||
|
|||
Pictures of the finalised transmission ,drive shafts extended , chain guide pulleys fitted and chain length shortened, there's a second guide pulley up front but its kind of hidden , you can see the screw that it runs on in the side of the tub in the second picture also a scratch in the tub i'll have to clean up before painting.
|
|
|