My latest!

This race car competes in USAC, (United States Auto Club) sanctioned events on half mile oval dirt tracks. The cars are constructed with a wheelbase between 84 and 90 inches and a minimum weight of 1,325 pounds, including driver. The engine design is based on the small block Chevrolet, but utilize special aluminum cylinder blocks and heads. Engine displacement is 410 cubic inches and develop over 900 horsepower running on methanol fuel. There is no flywheel, clutch, transmission or starter. A short drive shaft couples the engine to a quick change in and out differential. The driver controls differential engagement, (in or out) with a cockpit mounted lever and the car must be pushed to be started. The chassis suspension is called a "four bar" system. Each wheel is controlled by an independently adjusted torsion bar and shock absorber. There is a disc brake at the left front wheel and another on the left rear live axle. No brakes on the right side of the car. Tires are made specifically for these race cars, with the right rear having a larger circumference and wider tread than the left rear. Front tires are the same, right and left.
The common and fastest driving style is to drift the car around the turns. The driver taps the brakes as he enters the low side of the turn from the straightaway. This forces the car into a sideways attitude that is maintained using full throttle and due to the rear tire size stagger. Average speeds on a half mile track can exceed 135 miles an hour.

Forgot this one.

I saved a copy of the model file and removed the scenes (9), section plane and a couple of large unused components. File size did not get much smaller, (189 MB to 187), but the exporter now works.