Heya Chalingo.
If you're planning on building that non adult site up, one thing you might want to do is kind of turn it into a "portal." Not necessarily the whole site, but simply have the links there.
For instance, have some stuff on free newsletters. There are companies out there that pay over 50 cents for a email address just for somebody signing up for a friggen joke a day email. There's tons of categories to cater to just about anyone. I think one of the places are
http://www.focalex.com
Have links up for those who want to enter contests and shit, I think iwin.com or iwon.com has an affiliate program where every person you send over that registers (which is free) gets you a $1. Not sure about the price, haven't checked it out in a while.
But the point is that just because a site is about cars, you don't necessarily have to have just ads pertaining to cars to make cash. The main ingredient is TRAFFIC. Once you get that going, people click on whatever catches their eye. Kinda like porn sites. It's not uncommon to see a hardcore site have filter links off to asians, teen, interacial, etc...
Places like CJ.com are great. Definately join and browse their offerings. But before pimping a site under cj.com be sure to visit the site first and see if they have an affiliate program outside of CJ. If so, jump on it. CJ indirectly takes a cut of your earnings, so if you can cut the middle man out, more $$ for you.