Posted by Stan(VA). on November 14, 2007 at 05:48:12 from (4.249.180.173):
In Reply to: Re: Stan, I conceed posted by Hugh MacKay on November 14, 2007 at 04:24:35:
Hugh, I don't qualify as an expert engine builder, just sharing what I've found and what works for me. Engine tuning I still consider more of an art than a science(still do a lot of head scratchin), so if it's a working tractor that I don't want to continually mess with (and risk burning a valve), I set them both at about 0.020 cold. That comes from advice from someone? years back noting the same thing you noticed, that they did loosen up the specs in later years, and that I am setting them cold vs hot. I realize I'm throwing away a little intake duration and lift, but don't loose sleep over it, and numbers are easy to remember. If I am in an educational/experimental mood I will sometimes try tighter specs. Haven't done it yet but have considered following ChadS's advice on setting them with the compression gauge on an experimental engine.
One other note is that you switched to a 12V system. Did you add a ballast resistor or change to a 3 ohm (across the primaries) coil? A 6V coil would work but can break down as it heats up from the extra current and burns up your points faster... Hope that helps, Stan(VA).
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