I read somewhere that many Asian rape victims are attacked by black men, but I wanted to check it out for myself.
I looked at the National Crime Victimization Survey (NCVS) over the years 1992 through 2005 in order to maximize cases. Rape is rare (thank God), so I only found 11 cases of raped Asian (and Pacific Islander) women. Of the offenders, 5 were white, 4 were "other," and two were unknown. I'm assuming that most of the 4 "others" were Asians (Hispanics are a possibility as well); an Asian category is not available. None of the perps was black. The NCVS can't tell us if any of those whites are Hispanic since, according to the survey, Hispanics can be victims but not offenders.
The numbers are just too small to tell us much. Victims were also asked about attempted rapes. Asian women reported one white, one black, and one "other" perpetrator.