ORANGE COUNTY EARNINGS

Onyx Acceptance Corp.: The Irvine automobile finance company said second-quarter net income more than doubled, to $1.4 million, or 21 cents a share, from $653,210, or 10 cents a share, in the same period of 1997. Revenue gained 63% to $14.2 million from $8.7 million. Net income for the six-month period increased 69% to $2.2 million, or 34 cents a share, from $1.3 million, or 20 cents a share, for the like period a year ago. Revenue advanced 64% to $26.1 million from $15.9 million.