Nifty below 8250, Sensex opens lower; Maruti, BHEL, LT up

Nifty below 8250, Sensex opens lower; Maruti, BHEL, LT up Maruti, Bharti, Coal India, HUL and Wipro are top gainers while Lupin, Vedanta, HDFC, Cipla and ONGC are laggards.