ORIGINAL: downunder
ORIGINAL: Sport_Pilot
The only problem I have with high compression engines is that they are more difficult to idle slow and shake more. This because if the increased resistance during the compression stroke.
My experience has been different. When I raised the comp on an Enya 60X from the standard 9.75 to 13.5:1 to make the most of zero nitro fuel I found I had to lean out the idle mix drastically and it then idled much slower and very steadily.
downunder...
More compression ratio = more hotter air/fuel mixture. And glowplug will keep warm in higher compression in idle.
In old instruction paper for SABB hot bulb engine from 1930.. how to adjust casket height for cylinder head. There are wrote: Higher casket thickness make less knocking in high revolution and poor idling cause colder hot bulb.
Thinner casket height make better idling, keeping hot bulb warm in idling and more knocking in high revolution.
Glowplug engine and hot bulb engine are familiar.
Jens Eirik