If I remember my IC Engines theory, (that was longer ago than I care to
admit) retarded timing will cause a hotter engine. I believe it is because
ignition is occurring at lower pressures and burning longer. Since the
combustion process is also starting later and lasting longer, more surface
area is exposed to the heat of combustion. It can also cause the exhaust
gasses to be hotter since there has been less expansion before the exhaust
valve opens.
I've been playing with my timing and it is now set at about 16 BTDC. I'm
getting no pinging when accelerating hard under load (1000 rpm in 4th). I'm
also getting no running on at shut down. The throttle response is great. My
vacuum retard doesn't work, so it's disconnected, otherwise my engine is
completely stock. I'm thinking of bumping it up some more, as long as I
don't get any pinging. Any risk to this? I'm using 92 octane.
Walt Philipson
'74 TR6
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