What is "engine temperature?" Coolant temperature? Ignition timing
determines how much cylinder wall is exposed to combustion at maximum
heat and pressure (Brake Mean Effective Pressure). This is often 10-15
degrees after top-dead-center. The more retarded the timing is, the
later BMEP occurs which also exposes more cylinder wall which ...
transfers more heat to the cooling system. You can also affect "engine
temperature" (referring to combustion temperature) with ignition timing
by over advancing the timing to the point of bringing on spark know,
preignition, or detonation. Is this a test question for an auto shop
class?
--

Philip

"If a long train of abuses, prevarications, and artifices, all tending
the same way, make the design visible to the people . tis not to be
wondered that they should then rouse themselves."
- John Locke (1632-1704)


"Iantos" <morpheus (AT) qualitynet (DOT) net> wrote