Since it hasn’t been shown what this frame is being built off of, I figured it’d be good to give a peak at the final rendering that all dimensions are following:
Thomas Baron’s Ariel Atom II blog page has full 3D models, blueprints, and renderings.
In some ways the rear sub-frame should be easier than the front, and in some ways harder. We are using left over tubing from the 24′ sticks we had to buy for the roll bending. The jig won’t be quite as self-explanatory, because we have to deal with the upper side tubes of the sub-frame being 2″ diameter here, instead of 1.5″.
You can tell from this picture what is being done. We’re going to construct the sides of the sub-frame first, dealing with the difference of tubing diameter by offsetting those tubes over the edge of the actual table using sections of 2×4’s with milled flat sides for accuracy. All of the 2×4 pieces are being offset from the edge of the table by using plate aluminum of the correct thickness, and locking them into place before screwing them down by using a few sturdy clamps. It’s turning out very well so far.
There are a few decisions to be made on the overall dimensions of the sub-frame. For one, we’re dealing with a different motor here. Not only is it a different make of motor meaning the dimensions won’t be the same, but the intake and exhaust are on opposite sites on our motor choice when compared to the ‘real’ Atom. We are going to attempt to get all of the dimensions close enough to keep the half-shafts as straight as possible both from a bird’s eye view, as well as a ground level view. This could be tricky…
I think the powerplant has finally been decided on, and it was really in front of me the entire time! I have all of the large 4g63T parts to assemble a mock up, and was able to come across a N/T transmission. I have bolted together a bare engine block and a spare head for measurements and mocking up in the engine frame when the time comes. Not sure yet on what the final build will contain, but that can be decided well in the future. This car will end up even being fun with a non-turbo version, so I don’t think it’s important to work those details out now.