This HCCI concept is interesting... it's something that Smokey Yunick experimented with. I think he had limited success with it, basically the engine was running in severe knock conditions.

The last I heard the HCCI engine would run fine until it was loaded, then detonation/pre-ignition would take over.

Question, how does the engine perform a cold start?
I thought it needed a preheated air charge.

Regards,