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Iron cylinder liners in aluminum block?

     In digest #111, ASteele101@domain.elided wrote:
     >. . . Why doesn't BMW use iron cylinder liners pressed into the 
     >aluminum block? I believe Honda has been doing this for over a 
     >decade. . .
     
     Do the different rates of expansion from heat for iron and aluminum 
     (when using iron cylinder liners in an aluminum block) cause any 
     noticeable problems?  I would _guess_ poor heat transmission or 
     distortion of the cylinder shape could occur.
     
     Does anyone know for sure if this is a bad compromise, or is it just 
     too expensive (or patented)?  I thought Porsche had used liners too.
     
     Dean R.
     '95 M3