20-08-2020, 03:35 AM
(This post was last modified: 20-08-2020, 03:40 AM by Tony Press.)
Not seen this before but the Cornwall Club Technical Articles, Distributor Maintenance does show:
"2. Lucas Automatic advance
From the Ruby onwards, a driver aid was fitted that did away for the necessity of adjusting the timing by hand to start the car. The Lucas DK4A series have an automatic mechanism that also varies the timing a little bit, some 8 degrees, in relation to the engine speed. As compression ratios were increased and fuels improved, the later cars’ mechanism allowed more advance at 12 degrees. This gives a little bit more power at high revs and a little bit smoother tick-over when combined with the higher compression engines.
This article, written by Geoff Hardman and Andrew Jarmin, originally appeared in CA7C Seven Focus in July 2009 pp22-24, and Aug 2009 pp23-26."
I don't think this is quite correct !
Their Data page states Lucas Auto advance early 3 degrees later 8 degree !!
"2. Lucas Automatic advance
From the Ruby onwards, a driver aid was fitted that did away for the necessity of adjusting the timing by hand to start the car. The Lucas DK4A series have an automatic mechanism that also varies the timing a little bit, some 8 degrees, in relation to the engine speed. As compression ratios were increased and fuels improved, the later cars’ mechanism allowed more advance at 12 degrees. This gives a little bit more power at high revs and a little bit smoother tick-over when combined with the higher compression engines.
This article, written by Geoff Hardman and Andrew Jarmin, originally appeared in CA7C Seven Focus in July 2009 pp22-24, and Aug 2009 pp23-26."
I don't think this is quite correct !
Their Data page states Lucas Auto advance early 3 degrees later 8 degree !!