http://www.honda.com/newsandviews/ar...d=200707112298

There are lots of little tidbits that have been discussed here over the years. But I don't remember seeing this much about the changes on one piece of paper(?).

I was actually looking for the reason why the F22C1 has so little oil consumption compared to the F20C1. Here is the reason (or at least my best guess!):

"Additionally, "dummy head honing," a process where the engine block cylinders are honed with a "dummy" cylinder head tightened to the block, improves machining accuracy for stability of piston movement."

I didn't know how exactly to explain it on another forum, so here it is.

Maybe this would make a good sticky somewhere?

 

Post '04 F20C2's sold in Europe (and elsewhere) also use less oil for the same reason.

That said: switching too soon to (true) syn oil may stop the proper break-in of the FRM liners.
That combined with the old style honing = oil burner.

 

That article used to be here on S2ki, but it looks like a lot of the longer posts were truncated in the site migration. You may want to look here for 2004 info - https://www.s2ki.com/s2000/topic/483...and-2004-2005/