09-13-2021, 12:43 PM
(09-13-2021, 10:12 AM)furious_blue_imp Wrote: Probably not relevant here but I'll mention it.It makes sense on a Softail to a certain extent if we are talking about a twin-cam because there is a design flaw with the oil pump for the rear cylinder. From what I remember it wouldn't create enough pressure on idle so in stop and go traffic the cylinder would dry up and seize. HD have since implemented the system where the rear cylinder shuts down completely on idle and it's a system they are utilizing on the M8 even though it's water-cooled.
My long gone Harley Softail was programmed to kick into high idle if the oil temperature got above a preset limit. The idea is that with the engine on the brink of overheating they want oil circulating faster to cool the engine. Given that I'm sure that they've tested this thoroughly and it works as an emergency measure, it kind of surprised me to read about this in the manual because I would have just assumed that higher rpms automatically meant higher temps, but then this is the idle speed and the engine isn't running under a real load when this happens so I guess it makes sense. It had happened to me a few times on that bike and once traffic got moving and the engine cooled down the idle speed would go back to normal.
There is no system of that kind on the CB1100 (not officially anyways)
I heard a YouTuber once talk about a system on the CB1100 that allegedly skips a spark on random cylinders when the temperature goes too high, and I tried to find any official information on this, I even hit up a guy I know here who is a regional manager for Honda motorcycles here in the ME, and he told me that that's not the case, only cooling technology Honda is utilizing is the machining tech that allows them to cut the cooling fins thinner and longer (deeper) and that supposedly dissipates heat better.
'14 CB1100 STD 5 speed