View single post by Gary Martin JH 15371
 Posted: 08-01-2009 09:59 pm
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Gary Martin JH 15371


Joined: 03-12-2005
Location: Portland, OR
Posts: 98
I have advanced the timing  from 5 deg back to standard 10 deg BTDC and this seems to have improved my coughing and bucking problem at lower RPM. So it seems having the timing too far retarded must have been causing this condition. However my other problem with spark knock has returned under medium to heavy acceleration. It will ping and knock from 1500 to 3500 rpm under med-heavy acceleration. I have not wound it up much past 4000 yet as I'm still sorting out the car. Does anyone know the correct mechanical advance curve ? With timing at 10 deg @idle, I'm getting about 35 deg total timing at 3000 rpm. Maybe the distributor has too light of advance springs, or too much total advance ? I bought this engine complete with dizzy and have not had dizzy out to inspect it yet. It has Pertronix ignition and it does not have a vacuum advance module.  Not sure if is a complete Pertronix dizzy or if someone just added the Pertronix module and removed the vacuum module.  Gary