Re: ignition timing on 34 1103
Posted by Owen_Dyneto On 2009/4/30 8:47:40
Backfiring isn't usually the result of ignition timing being off a few degrees - are you sure you have an ignition problem? If you still have the twin coil, dual point, double-ended rotor system, are you aware that you have to time each set of 4 cylinders (timing #1 and #6)independently? Or synchronize the two sets of points before reinstallating the distributor? Perhaps this is old info to you, but just in case I'll enclose a couple of articles previously published by PAC's local region which may help you; ignore the picture of the Delco distributor misidentified as a NorthEast unit.
As to timing marks on the damper, are you sure they're just not obscured by paint, or very faint? There should be two sets of marks, one for each set of cylinders that require timing. There are also timing marks on the flywheel that are useful for static timing, though you have to remove the starter motor to access.
Though it's complicated on the 33/34 cars with the dual ignition, one of the best ways to do ignition timing is the "by the ear" method, simply taking a series of test drives up a modest hill in high gear under acceleration, and progressively advancing the timing until you get just a faint hint of preignition.
I'm not familiar with T&E 1522 - can you give me a reference to where I can review it?
But again, ignition wouldn't be my first suspect with a backfiring problem - for example have you checked valve clearances?
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As to timing marks on the damper, are you sure they're just not obscured by paint, or very faint? There should be two sets of marks, one for each set of cylinders that require timing. There are also timing marks on the flywheel that are useful for static timing, though you have to remove the starter motor to access.
Though it's complicated on the 33/34 cars with the dual ignition, one of the best ways to do ignition timing is the "by the ear" method, simply taking a series of test drives up a modest hill in high gear under acceleration, and progressively advancing the timing until you get just a faint hint of preignition.
I'm not familiar with T&E 1522 - can you give me a reference to where I can review it?
But again, ignition wouldn't be my first suspect with a backfiring problem - for example have you checked valve clearances?
Attach file:
(387.13 KB)
(227.50 KB)
(178.40 KB)
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