Show whole topic Feb 12, 2017 10:20 pm
davidbracey Offline
Member
Registered since: Aug 10, 2012
Location: Maidstone, Kent


Subject: Re: Meadows Engine Help
This is my understanding and please correct me if I'm wrong.
High compression engines burn fuel much more cleanly. An unclean burn is an inefficient burn - hence more wasted energy in the form of heat.
High compression engines need to be much more accurately set up for ignition timing and correct fuel/air mixture because under higher compression combustion can begin before a spark is generated giving a much narrower ignition timing window.
Incidentally, when I bought my car it had a decompression plate fitted - presumably so that it could run on poor quality fuel available during and after the war.