Yeah, I thought about doing that, but it seemed like a lot of work. I have worked on aircraft my whole life, and they have very closely defined CG,s that are known, and that can be easily computed, and when you do it on paper, it is exactly correct for the aircraft, and you can actually manipulate the balance point by tenths of an inch. I guess I will have to do the metal beam thing.
What I will probably do is fabricate the lift plates on each side, then jack it up using them, and move the contact point fore and aft until I get the best possible balance point, and then locate the lift point at that spot.
Thanks for the weight distribution figures!. That at least gives me a starting point, and it actually should be pretty close to that, based on how completely engineered modern cars are today.
I had thought about going ahead with the lift assembly driven by Acme screws, but I really want to complete the services on the car in the next week or so. I have two sets of ramps, so will just jack up each end, put it on a set of ramps, and then jack up the other end and put it on ramps, and do my work. Then take it down.
The lift can wait until I have more time this fall.
I am machining a jack point adapter out of aluminum, that fits the top of my hydraulic jack, and also fits the receptacle on the car side rails. I only have to make one piece for that to work just fine.