The general rule is that, if you're admitted, you won't get more than 70 units of credit, but you will get subject credit for all of your transferable courses such that you won't have to repeat coursework...in general.
Now, having completed coursework at a four year university could put you in a pickle. You may be rejected outright for having 80 transferable credits and having attended a four year university, or you may be rejected outright if you have 80-90 transferable credits all of which are from a four year university. Each campus/major handles the situation differently, and you can find the specific answer on page 12 of this document:
http://www.universityofcalifornia.ed..._Q&A_FINAL.pdf
If you don't see a policy listed specifically for the school of engineering at whatever campus you're considering, you may want to contact them. Often, engineering majors fall under different consideration policies from other majors.
Hope this helps,
Joe