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Jumping timing

To: datsun-roadsters@autox.team.net
Subject: Jumping timing
From: <gregs672liter@netzero.net>
Date: Wed, 9 Jun 2004 05:19:26 GMT
Greetings list... another question.  I think I asked about this a while back, 
but I have since switched computers etc. and no longer have the info.  When I 
check my timing on the 2000, as I rev it up to say 3500 rpms and hold it there, 
the timing sometimes appears to jump around according to the timing light... as 
much as 5-10 degrees.  I cannot imagine that this is normal.  I do have a 
multi-sparking ignition system with a "re-strike" capability if the flame goes 
out, so that could be what I am seeing, but I kinda doubt it.  What could be 
causing my timing to jump so radically?  Worn timing gears?  The chains are 
new, and the gears themselves, while not new, did not appear terrible (and I 
pretty much know what to look for... the sharp edge to the tooth, and rounding 
in the valley).  Could the issue be in the distributor gear itself?  My 
distributor seems tight, but could something be happening inside that causes 
the weight/springs to not function properly... to skip around?  Is some kind of 
"Crank fire" ignition system an option and has anyone done it?  Would a "scope" 
at a repair shop show what is happening to my timing more accurately than the 
'ol timing light?  What I see always appears to be a retardation of the timing. 
 This is on an engine that does not use vacuum advance.  Thanks for your input.
Greg Burrows






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