Technical Mounting coilover to 4 link bar?

I want to mount my coilover in front of my axle so you can't see it from the rear on my model a.
I have a beefy 4 link, any down falls on mounting the coilover just ahead of the bushing, right next to the axle, on the lower bar?
It's the easiest and cleanest option that I can see right now.
I don't see how it would be a problem, but want to double check with some experts first, I can make it work single shear off my lower bracket. It'd be cleaner and I'd rather do double shear on the lower bar. (I know everyone does it single shear, just a personal overbuilt preference).
Thanks for the advice.

 

I wouldn't do it that way. In part because the weight of the chassis/body will carried by the bushing in that lower bar, not to mention the bar's vertical load capacity as well, a load I doubt either was intended to carry. It seems to me attaching the coil over to the 4 bar bracket is the better choice. However, I do agree with you that double shear is preferable, in my mind at least.

Ray

 

I was thinking the bushing on the coilover is smaller than the link bushing so should be safe, but you are correct, I don't know the duro or load capacity of my bushings.
I know airbaggers often mount air bags on lower bars, but they also don't do a lot of things correctly either.

 

How about a picture of the setup where you want to put it?

 

IMHO you could mount shocks in front of axle similar to air bag guys however I wouldn't mount them on the lower arms, make a bracket that supports both shock and arm(s) leaving a clean rear diff housing. Double shear mounting would be ideal however most coil overs I've seen on the rear are single sheer only, top and/or bottom. I would use a larger diameter HT bolt in preference to a smaller diameter HT bolt. I presume you refer to a parallel 4 link or is is it triangulated?
Forward mounting the shocks may offer slightly more travel and a better ride quality. Rear mounting the shocks offers more load capacity, a minor trade off? The further outboard the shocks are placed, the better the handling. Lay them over slightly (In at top) rather than upright, this will prevent lateral movement as you drive.

 

I have routinely mounted coil-overs on the control arms, on off-road trucks. I have done a few air-ride cars that way too, to get more travel, in order to be able to remove the tires, well, ever.

It can indeed be done, but you must understand that "beefy" us a gross understatement when it comes to describing just how strong the control arms, bushings, bolts, and eyelets need to be.

I am not a fan of any critical suspension element being mounted in single-shear, unless the mount has been very exactly and properly designed, fabricated, welded, and installed.

Finding out the hard way that you screwed up might not be a pleasant experience.

 

That's all I have for now as far a pics. The outside of the mount is pretty close to the inside of the frame.

Does it matter as far as binding which way the mounts go?
If I could mount the lower so the bolt goes side to side, not front to back it would be easy to go off brackets.
I had it in my head it should be front to back, which would be awkward, clunky looking in double shear.

Also, I've read 30 degrees is ideal, is that true?

 

This would be no worse than mounting coilovers inboard on tubular A-Arms.

The only issue is you will need a spherical joint at the bottom of the coilover because the Link and the coilover will arc differently [ the link arcs longitudinal and the coilover arcs lateral ]

There are motion ratio calculations to consider , but being mounted adjacent to the pivot , this would be insignificant

 

A tubular a-arm has two tubes. A lower link on a 4-link is one single tube.

If they were not designed with a materials strength suitable for this desired function from the outset, the results may not be favorable.

I have seen common commercial 4-link bars that I can bend using a vise, and my strength alone.

 

It's 1.25" DOM heavy walled tubing, 1.75 rubber bushings and 5/8" grade 8 bolts. All custom made at a machine shop, not an over the counter generic speedway kit. It's way overkill for 2000lb model A with 300hp.

If the rear end weight of the car bends the link arms then lord help those who use a single shear 5/8" bolt to hold up their cars, like on so many high end cars out there.

So to my other question, to get proper mounting can you have the lower mount going side to side and the top front to back and not worry about binding?
Also 30 degrees, I was told that was the appropriate angle to mount your shocks, is this true?
After looking at it again, I'm not sure if I would have enough room to mount the coilovers on top of the bars and keep 30 degrees without hitting the upper bars, so might scrap that anyway.

Thanks or the ideas an help.