Thread: 3rd production radius arms

Did John ever chase up about acquiring the moulds for the holey bushes from Haultech ?

If not, I've been thinking of asking Fulcrum/Super Pro if it's feasible to machine some of their standard ones with a ball end mill, or just getting some stock and doing it anyway.

They have detailed turning instructions here Machining Polyurethane

Originally Posted by rick130

Did John ever chase up about acquiring the moulds for the holey bushes from Haultech ?

If not, I've been thinking of asking Fulcrum/Super Pro if it's feasible to machine some of their standard ones with a ball end mill, or just getting some stock and doing it anyway.

They have detailed turning instructions here Machining Polyurethane

Don't know if it would improve or adversely affect longevity, but instead of drilling holes, how would you go machining a concentric groove between the ID and OD of the bushings?
bill.

Originally Posted by wagoo

Don't know if it would improve or adversely affect longevity, but instead of drilling holes, how would you go machining a concentric groove between the ID and OD of the bushings?
bill.

That's what I was thinking of Bill, just not all the way around.

I was just going to roughly mimic the ones Sam made.

[edit] your suggestion may be easier and better.

I reckon a chippy could make a template and do it with a router

Originally Posted by 350RRC

There was a green Rover bodied thing in 4x4 Monthly some years ago that had long fabbed arms that articulated from near the middle of the chassis. The f&r mounts were only about a foot apart.

Pretty sure it ran Toy motor and driveline, chassis was RRC, body was either RRC or Def. Search might find it.

DL

It's not this car, is it (yes, I know this one's blue) ?

thanks Scouse,

I dont know if that is the truck 350RRC was talking about??? Those arms only look about 150mm or so longer than standard RA's. Stock RA's on a 110 mount aprrox 150mm behind the bulkhead line, those at a guess, look about 300mm behind

Not that one. Was definitely green and in really good nick. Might have had the pseudo military look with shovels and axes strapped on.

I remember the fabbed radius arms were like an I beam section, really neatly done and he looked to be using stock rubber bushes on the chassis ends with the stock mounts, which had been moved really close together as previously described.

cheers, DL

Originally Posted by wagoo

A little OT but it just occurred to me that in a high centre scenario,a vehicle with very long arms is more likely to belly out on the arms instead of the chassis. With the chassis bellied, the suspension can still unload to a degree before all traction is lost. With the long radius arms bellied I'd imagine that the vehicle would come to a stop much earlier.
I suppose the radius arm chassis mounts could be raised up to prevent this.
Bill.

That's exactly what I thought when I saw the one in the mag. I don't recall it having much of a lift.

It was around the time LRA started selling angled rear chassis / trailing arm bushes they had got made out of rubber. Even my POS had angled poly bushes on it when I bought it. (still there and in good nick after at least 200,000 k's)

I couldn't really see why he'd gone to all that trouble, but the workmanship was really good!

cheers, DL