1) I think that it will pop if the input voltage exceeds 17v or so
2) This is a linear device. Prepare for an 8 inch fan and about 3 tons of aluminum heat sink!!
I would use a switching regulator, the only bad thing is that it needs an inductor
http://www.national.com/ds/LM/LM2588.pdf wow look at this thing
perhaps it could withstand cranking. (lm2588-12)