870c project

[Bugle]

Just got this, needs a bit of work. The rear diff pulley is screwed. Rear shock tower seems to have been broken and repaired by gluing a washer to each side. Not a huge fan of the body that came with it!

Bulkheads look to be ok. Is the only place the bulkheads crack the shock tower mounts? I was thinking of making some new bulkhead caps which have small ears sticking out the side for the shock towers to attach to.

[uzzi]

Looks like an Andy's body.....nice pick up on the Yoke mate

[Bormac]

Glad to see you finaly have your Yoke'. I'll have a look to see if i can help you with a spare belt pulley. If I dont have one Chris (BESTY) might have a spare to get you going.

[59burst]

white wheels match the body. nice

[Bormac]

Is there any way the front one ways can be locked out? I want to run mine at St Ives but you realy need the front wheels to brake if you want to get the front end back down after the jumps.
Any idea's guys?

[Bugle]

Gonna get a body from mr lexan, haven't decided whether to get the protech or 870c body, probably have to get both!

It's the same tooth profile as the B34 pulleys so I should be able to make a pulley out of delrin

I was looking at locking the one way, looks pretty simple. I'd just need to make a thing which sits on the end of the shaft, locks onto the shaft with a grub screw and locks into the spur gear with pins going into the holes in the spur gear. So it'd be easy to change between one-way or locked.

Is it hard to get original spur gears for these things?

[pedro]

Is there any way the front one ways can be locked out? I want to run mine at St Ives but you realy need the front wheels to brake if you want to get the front end back down after the jumps.
Any idea's guys?

Jase, in the original 870c kits they came with both one way and a solid alloy adapter to lock the drive to the spur gear, is this what you are after? You can only do it if you have the stock one piece spur and rear drive pulley.
Peter

[karnivool]

here is a pic of what your after.

[besty22]

Hi , don't think I have a pulley spare.
I think I do have the one way Jason.

[Konich]

I have a new rear shock tower and I might have a new spur gear assembly in package. If your interested send me a PM

[Bormac]

Thomas I have a spare used belt pulley you can have. To be honest Im thinking the 501X looks to be the same unit. I will need to cross check.

[Bugle]

It's alright Konich i'm going to have to make a custom rear shock tower along with the new bulkhead caps. For the spur gear i'm just going to make a custom shaft & slipper clutch to suit B4 spur gears. Trying to make it as reliable a runner as possible.

Yeah Jason looks like the front tamiya pulley is 35 teeth so it might work. Do tamiya use the same rounded belt teeth? It has less diff balls which might not be good though. Most important thing for it to actually work would be that the centre hole is the same diameter and the diff balls are the same diameter. Don't worry about giving me one of your Yoke ones you might need it, making one from scratch isn't very hard, just a bit tedious milling all those teeth!

I'm thinking I might need to make a rear belt tensioner for it aswell along with a top deck, probably something like the 94 YZ10 with the turnbuckle thing..

[Mr. ED]

I have played around with several pulleys to obtain some kind of overdrive on the front. It didn't work out with the tamiya pulley. Because it uses larger diffballs the diffunit became too wide to fit in the bearing houses

[highwayracer]

I have played around with several pulleys to obtain some kind of overdrive on the front. It didn't work out with the tamiya pulley. Because it uses larger diffballs the diffunit became too wide to fit in the bearing houses

hey Erik,

What size are the diff balls on the 870c? and is there a modern car that uses the same size? What size were the tamiya diff balls?

Regards,
Roger

[Bugle]

Recently discovered the most awesome transmitter ever made, so I got one to use with this car. 75MHz is illegal to use in Australia though so i'm going to convert it to spread spectrum with a Corona 2.4GHz module.