Walt,
This isn't from a position of great knowledge, but... Does your model have
both advance and retard? I know that several very strange problems were
fixed by getting the retard fixed and fully operational (including the water
temp valve). The most significant was that engine temperature no longer
heads for the "H" peg at idle.
I personally vote for getting the retard back to working.
Steve
tr6@kc4sw.com
-----Original Message-----
From: owner-6pack@autox.team.net [mailto:owner-6pack@autox.team.net]On
Behalf Of Walt Philipson
Sent: Monday, July 21, 2003 5:52 AM
To: 6 Pack (E-mail)
Subject: Re: 74 TR6 Timing
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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