Hello people, have already found the following post on the topic:http://www.motor-talk.de/…/…on-240d-3-0-possible-t500543.html?… Since the post is already from 2004, here’s the question, is there anything new about an optimization? I have a 220 OM615 with approx. 220tkm, which I would like to integrate into a former 250, W114. Since this is not a project, which should last only one summer, I want to optimize the engine with regard to consumption and performance. A 5-speed transmission is already available. and the 250er has i=3,69, so that you can drive at 3,000 rpm approx. real 115km/h. What can you do exactly on the head? Drilling in front of chambers, which pre-chambers, the existing or new ones? Camshaft, if necessary exact designation? Should you also take other valve seats (hard) and possibly valves? Which nozzles, if necessary with other holders? Does an injection pump from the 240er actually bring more, or is it enough to reseal the old 220er? What else is there? Thanks also to detaus, who gave me first hints! P.S.: The car should keep H-marks, so a turbo is not possible, only things that you don’t see!