In road race engine size does matter along with the skill and balls of the pilot. Single car times can vary greater from event to event based on track conditions and weather due to how long a road course is vs any shorter sprint track. You might fight hard at the sprint track to find that half second lost with a green track, you might fight hard to find 2 seconds lost on a green road circuit. ICC @385lbs vs stock moto @400 (IKF standard) on a 2+ mile track will usually be about a 1.5 second lap time difference. Throw a big pack of dudes in with either style motor and expect the fast lap time to come from the best drafting person. If you want to really test road times you need the same guy with skill on both motor styles with no draft.