Timing chains have been used since the early 1900's while the "Gates" Toothed belt system didn't show up until the 1960's. So which is the old tech? That said, the Subaru H6 and new H4 diesel engines use chain drive for their cams. I think this was done as much for space saving as anything else but I might be wrong. Expect to see chain driven cams on the new DI H4 engines that should be making their debut for the 2011 or 2012 MY.wow... that is pretty old tech... why not timing chain?
Well, the very first one may be the DI 2.0L in the Toyobaru Coupe sometime in 2010-2011 but we might also see it as a new engine in the Impreza/Forester/Legacy lines in a 2.3-2.4L version.but when will those engines come to the states?