^ Keep in mind that I'm NOT from engineering, so if a school has a separate engineering school this could be completely wrong, or if they make exception for people in engineering/math/hard sciences. In psychology, the cutoff for total GRE at top schools is about 1350. Again, not necessarily true for top grad schools in engineering -- I'd google it if I were you; I suspect the information is very readily available with a simple google search. Schools will, under their application FAQs, often say what sort of minimum GRE score they recommend for prospective applicants.
You could also look at the TGC Results Survey and filter for engineering majors to see what kind of scores have been accepted/rejected recently.
ETA: Someone's started a general applicant discussion thread on the Engineering forum Might be a good idea to ask over there.