PhilR. wrote:
Damage was incurred, until the American companies figured out ways to get around this. ..... A high-idle mechanism solved this problem.
Well ... that seems to me to not really be "getting around this (problem)". After all, the idea of idling quietly means just that ... idling in the mid-hundreds of RPM for maximum quietness... not rev'ing somewhere above 1000 RPM. The high-idle approach raises the noise back up above the quietness of a truly idling Sprinter's small diesel engine.
As many know, the Ford V10 RV engine can of course "idle" for hours at a low 550-650 RPM, which makes outside engine noise ultra-low (lower then small portable Honda inverter generators at their idle speed). Inside an idling V10 motorhome, the (our) engine cannot be heard or felt. Very nice and un-obtrusive.