Colin
Is your damper the original or has it been replace / renewed? If it is
the
original than I would not trust the timing marks as the rubber in the
damper has
probably deteriorated causing a variation of what you think the
timing is.
If you have your carbs balanced, try using a vacuum gauge to get
your timing
adjusted. You want your vacuum under the 20 mark. 19.5 would be
good. For every
1000 ft above sea level you live move it down a point. If you
have a steady
vacuum needle then your engine is in good health. With the cam
you have there
maybe a slight quiver to your needle. You should still be able
to get back to
the 850 rpm range for your idle.
Dale
________________________________
From: COLIN THOM <colinthom@shaw.ca>
To:
6pack@autox.team.net
Sent: Wed, September 22, 2010 3:48:08 PM
Subject: [6pack]
Ignition Timing
Hi Gang..what's the verdict on ignition timing? Here are the
details: 270 deg.
duration cam with 108 deg lobe separation, stock rocker arm
ratio, compression
upped to 10 :1...maybe a bit higher, vacuum system
disabled, running 86 octane
smoothly enough, Pertronics...no points, Lucas
high-output coil. I'm getting
some occasional back firing through the carbs
when pulling away from a dead stop
and am trying to figure out what's causing
it. Currently the timing's set at
about 14 deg BTDC at 825-850 rpm then idle
is upped to 900-ish, which seems to
have helped a bit. Thanks as always,
Colin '75
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