Scorpion 4x4 Build project

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Re: Scorpion 4x4 Build project

Post by klavy69 »

Oh definitely. Understand why you did it. There is a time for a wider front track and this one was just overwhelming by the angle of the pictures....you could've still boxed it up and sent it to me as it was and I'd live with it but it just looks so much better now :mrgreen:

Keep the updates coming 8)

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Re: Scorpion 4x4 Build project

Post by Dadio »

I just took her out in the road for a shake down of what I've done so far ,it went well with no issues so far , also had a minor disappointment with the front wheels , I was really hoping that I could use rear tyres up front ,if not the stock wheels and tyres then at least some nice period looking tread pattern but...... Now that I've got the track right the wider wheels foul on the suspension at full lock and depressed suspension ,the bump steer pulls the wheel into a tighter lock and if I limit the steering to overcome the problem then it has a very poor lock .
So it's narrower front wheels as well :(
For the test drive I threw on some Schumacher yellow low profile cut stager's and I tell you what it was a night and day difference even over the soft scorpion front tyres , really handled well , turned in better but they look wrong for what I'm trying to achieve .
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Re: Scorpion 4x4 Build project

Post by Mr. ED »

Are you using the front hinge of the rerelease or the original?
The original is narrower and could maybe work with the wide hex adapters you started with.

Or you could revert to that wide front setup, and widen the rear end to match that. Moving the swing arms out some, and, or, using wideners at the hex.
My ghostrider was 250mm wide in both the front and rear.

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Re: Scorpion 4x4 Build project

Post by Dadio »

The front suspension rod (hinge) is actually cut and shortened already ,it's about 12mm shorter than stock so I can't find any more there as the bend in the rod is virtually at the chassis rail ,I might get another 2 or 3 mm more inward movement but not enough to get the clearance for the rear tyres up front.
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Re: Scorpion 4x4 Build project

Post by Mr. ED »

How wide was your front with the wide front wheels and adapters?

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Re: Scorpion 4x4 Build project

Post by Dadio »

With the stock hex wheel adapters up front it was 250mm , stock rear track is 230mm , I've got the front about 3mm per wheel inside the rear so about 224mm total front track with rear tyres up front or 220mm with normal front tyres . If I'm using narrower front tyres I could increase the track again by a few mm but it looks right for the car now with it slightly narrower up front .
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Re: Scorpion 4x4 Build project

Post by Lonestar »

That's going to be interesting :) Looking forward to the part of the build that brings the transmission to the front of the chassis. Great start!
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Re: Scorpion 4x4 Build project

Post by Dadio »

I made a first attempt at the extended lay shaft for fitting the rear sprocket , it went badly , it's hard to make such a narrow shaft that's so long because it flexes at its furthest point from the lath chuck so that there's not an even diameter along the shaft but a slight taper .
I'll have another go tonight using a revolving centre to support the furthest end from the chuck but it's so small it will be like keyhole surgery to get the cutting too in between the chuck and revolving centre .
There's another way I can try and that's to make the shaft 20mm at a time , slowly moving the metal bar out from the chuck to cut the next bit , unfortunately that's the least accurate way to do it as you get tiny differences in the centering of the metal in the chuck each time you move it .
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Re: Scorpion 4x4 Build project

Post by Dadio »

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 .
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Re: Scorpion 4x4 Build project

Post by Dadio »

And the front Lay Shaft made up , again its over long and can be shortened later.
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Re: Scorpion 4x4 Build project

Post by Lonestar »

that's really cool... Some serious competitor to the almighty old-school trailing arm 4wd a la Robbe/Kyosho/AYK will be born soon :) awesome!
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Re: Scorpion 4x4 Build project

Post by Dadio »

I'm not sure how soon it will get finished , to be honest I've only done the easy bits so far , I've never made a gearbox before , I'm confident I can do it but it's going to take time and lots of it to get it to fit under the body along with the steering .
For me getting it all to fit under the body is non negotiable , it must still look like a Scorpion when I'm done , my only concession to that is raising the body slightly , it should be possible to raise the front of the body 4 or 5 mm without it looking wrong ,I'm hoping that will be enough but if I can't then to me it's a deal breaker and it will revert to being a 2wd .
If a jobs not worth doing then its certainly not worth doing well.
A problem shared is a problem halved but an advantage shared is no advantage at all.

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Re: Scorpion 4x4 Build project

Post by Dadio »

Made a start on the front gearbox , it's a bit clunky but it's early days .
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Re: Scorpion 4x4 Build project

Post by Mr. ED »

Which sizes are those flanged bearings and who sells them?

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Re: Scorpion 4x4 Build project

Post by Dadio »

Diff bearings are 15x10x4 from Schumie-spares on ebay and the lay shaft bearings are 10x5 x4 from Apex models. Both were from eBay.
If a jobs not worth doing then its certainly not worth doing well.
A problem shared is a problem halved but an advantage shared is no advantage at all.

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