Rear Suspension Rocker Arm Mounts & Nose Mounts

Rocker Bushing

Rear suspension rocker arm mount shaft bushing

Above you’ll see that my welding continues to improve, although slowly. In response to the deleted commenter of the day, yes, we do use dyslexic dwarfs to do our welding, but we get ours from Lithuania. Good guess, though!

Next we have photos of the rear suspension rocker arm mounts. As these have to be positioned correctly in three dimensions and three axes, and none of those are X, Y, or Z, it took about a week to get these fabricated and fitted. Starting with laser-cut pieces proved useful as that gave me a known-good shape to start from, but some of the frame rails could be a few millimeters off. Also, every time I weld on something it distorts. Both halves of the rocker arm mounts must be precisely concentric and exactly the correct distance apart. Unfortunately they are not connected directly to each other in order to allow for rocker arm movement between them so there’s plenty of opportunity for them to move, even though I did the welding with the rocker arm shafts in place. In the photo with the control arms installed, you’ll see one answer to that: a long piece of steel rebar turned to fit inside the rocker arm shaft bores. Pounding on that with a rubber mallet would move the bores back into alignment a bit at a time.

Also, nose mounts. In the end these look terribly simple, but it took me a lot of thinking about how to do this. They have to be strong enough in one direction to lift the nose of the car with a pivoting jack, and in the other direction they have to support the downforce of the front wing. Also, they can’t protrude or be sharp so as not to injure another driver in a crash while taking the tremendous force of a forward impact, and have to allow the nose to be adjusted in three dimensions and two axes for proper body fit. Body installation begins here; the rest of the body will be keyed off the nose.

Nose Mounts

Nose attachment points laser cut and welded in place.

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2 responses to “Rear Suspension Rocker Arm Mounts & Nose Mounts

  1. Hello! I was searching for a snap ring groove cutter and ran into this splendid race car you are building. If time permits, could you tell me the brand of the tool holder? Also, and oddly enough, the whole reason for my search is in an effort to build rocker controlled coil over shock system on an offroad Bronco. So, I was wondering how you came about to determine the ratio on the rocker?

    • My snap ring groove cutters are just random bits bought from Ebay US. Always lots of great stuff there. On the motion ratios, I just tried to get 1:1 so that most springs and dampers are applicable. People on ApexSpeed.com are pretty clear that going below 0.8:1 causes problems with damper valving and overall compliance, or flexing, in the suspension.

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