2 Blogs, 1 Domain Questions

Hey everyone,
My question is,

I have blog A: www.yoursite.com

its about cars, and information, it gets good traffic, 40,000 + uniques a day,

And now, I want to create Blog B: www.yoursite.com/hunt

The site will only be about rare car findings on ebay, with a affiliates link.

same domain, two blogs, one with hunt at the end. Both will have similar content, while the hunt will go on about rare stuff, old and new, that the www.yoursite.com will not have.

Each will have a unique site map, meta tags, titles, etc. Is this considered duplicate content? none of the blogs will display the same thing, but under the same tree.

Please, I need help asap, I would greatly appreciate it.

i don't think so.. as long as the contents are different..

Thanks,
Yea the titles are different, but same subject.