So with the advance non-functional the rover will need a (slightly) larger throttle opening to develope the power to overcome friction than would be nessesary if you were burning the fuel in an efficent manner. When you womp the go pedal to the floor(which in a 109 is always) the "vacuum" goes away and the static or mechanical advance setting takes over as the max. advance that the engine can stand at that rpm and temperature during max. cyl. filling...... whew......this is one way that the modern engines get the fuel mileage that they do.. they electronicly control the timing and with knock sensors and such keep the timing at the higest possible setting eg: just short of"Knocking" The land rover along with any car of the period will often run well shy of the optimum timing to prevent engine damage (the timing needs can be dependant on so many things that there is not a single mechanical device that can cope with all the changes in fuel, temperatue, air density etc. This explains the low compression ratio on the Lander...the folks at Solihull do not have any control on the type of "Camel piss" that you will be putting in the tank at 117 F. w/o enough water in the radiator,while pulling Montana up mount Everest.....
OK I'll stop.....I'm goin' ta' school to teach this stuff....now if there were a course in keeping students AWAKE........
(More than)
'nuff said
steve..
Steven M. Denis
Erieville,NY 13061