You sound as if you have something to add, yet you added nothing despite posting this. Most of the information is there. I personally collected a ton of information for the K20Z3 (not on this site), but the R18 hasn't gotten a ton of shine. Honda Tuning covered this engine twice, once in a small blurb in their news section and again when they tore it apart to have a look at it. They found some interesting things. I may or may not have a bit more information on the R20, which is similar to the R18 and could provide a bit of help to those in need.