Anyone know where to get a rear control arm for Rocky F78?

jennyrebel
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Re: Anyone know where to get a rear control arm for Rocky F7

Unread post by jennyrebel » June 29th, 2014, 2:35 pm

Greg - I paid $610 to get the new arms shipped over. Not sure how much it will end up being to have them altered yet. I have noticed that bloodredoffroad posted some pics on facebook of a new design of trailing arm they are now making which are more like the original ones, not tubular. They still have the rose joint at one end though instead of a bushing, the guy at bloodred says that they are less likely to snap with a rose joint.
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mydmax
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Re: Anyone know where to get a rear control arm for Rocky F7

Unread post by mydmax » June 29th, 2014, 5:28 pm

The rose joint one doesn't provide any cushioning of rearward suspension forces and will likely be more harsh when used. ie Noisey and will wear in one spot and rattle.

Now seen, it shouldn't be too hard to over skin the OE arm to add additional weld strength and integrity to the OE arm. A full wrapped strip around the front bush area would substantially increase it's strength with minimal weight. Many arms are made like that.

How do you keep the rose joint lubricated and the crap out of it?
Not a fan of the suspension forces being on one relatively small rose joint thread. and ALL the forces are on the rose joint eye strength.

The term given"less likely to snap" is of concern. It is the snapping of the thread which I would be most worried about.

What is the specs of the rose joint? In race cars where they are used, sometimes with a hit they merely blow to pieces.
Low strength compared to the OE one I think.

jennyrebel
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Re: Anyone know where to get a rear control arm for Rocky F7

Unread post by jennyrebel » June 30th, 2014, 7:53 pm

Thanks for your thoughts Mydmax, I suppose now I have the new arm's all I can do is just give them a "red hot" go. I'm hopeful that they will be fine. I don't know the specs of the rose joints but they are pretty solid stainless steel and I think that to prevent any crap getting in they will have to be greased. Maybe in race cars the rose joints blowing to pieces has something to do with the speed and G forces?
I'll have to report back on how noisy they are once I've got them on. I will get the old ones strengthened like you suggest, then at least I'll have them to fall back on if they are no good. :purplex:

kalla20
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Re: Anyone know where to get a rear control arm for Rocky F7

Unread post by kalla20 » July 1st, 2014, 4:13 am

Hey I just bought a set while I'm over here in Europe and cost me around 490 maybe but im not paying for shipping.
the reason being they wont snap is when the rear end flexes there there is no sideways movement and it puts stresses on the joint, the rose joint eliminates this. I have seen rose joints on tractors take a hell of a lot of punishment and I doubt the mud would worry them with proper care.
the old rockys aren't exactly speed machines so I wouldnt worry about the stresses on it at all.

I cant wait to chuck em under and give em a crack when I get home
Daihatsu Rocky 2.8 TD

Build Thread - viewtopic.php?f=187&t=147181

gregp50
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Re: Anyone know where to get a rear control arm for Rocky F7

Unread post by gregp50 » July 1st, 2014, 1:52 pm

Hmm jenny bloodred should be aware of the length problem of the new type trailing, have a word to them and see if they can help y out, I found when one broke on my f78 rocky the old owner had put aftermarket trailing arm bushes on which don't flex as much as original. Also when I changed my original radiator to one a radiator specialist put in it started to overheat.

jennyrebel
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Joined: January 4th, 2014, 9:27 am

Re: Anyone know where to get a rear control arm for Rocky F7

Unread post by jennyrebel » July 1st, 2014, 6:41 pm

Hey Kalla good for you - wonder how much it will cost in excess baggage on the plane? I am really pleased with them it's just that my mechanic wasn't keen to fit them being that bit longer than the originals as he says it will affect the angle of the diff and eventually cause problems. Make sure you check the length properly when you get home.
Greg - I have spoken to the guy at Bloodred and sent pics - he says this is the first time anyone has picked up on the discrepancy. He has got local customers who have fitted them without any problems, but I don't want to risk buggering up the diff. So anyhow he is sending the new inserts for the rose joints so they will have to be cut off then re- engineered and welded to size of the original ones. Pain in the bum I know, its a shame there's no one over here that makes them it would have made it a lot easier. Actually now you mention it - the Bloodred guy says that he made them with the rose joints exactly because of the problem with inferior polyeurythane bushings which contribute to the arms fracturing.
Nice to know tractors use rose joints - that gives me a good feeling!

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