Re: [AMC-List] Continuing Saga of Doc the Jeep, Part II.5

[Nick Lenarz <n9viw@xxxxxxxxx>]

 WOO HOO!!! I KNEW I wasn't crazy! :p

Just got off the phone with William at Comp Cams tech help line. I
asked him what the correlation was, if any, between ignition timing and
valve timing. He told me that, depending on where the valve timing is,
the ignition timing is going to HAVE to change in order to capture the
best possible ignition time in relation to both the crankshaft position
AND valve positions.
If I had set my adjustable timing set to the 3* retarded position, my
ignition timing would subsequently have to be retarded as well to
produce power at the point the valves are closed and the piston is at
TDC; however, since I advanced the timing gears on a cam that's ALREADY
advanced, I put myself in a bind. The 7* combined valve advance would
REQUIRE ignition timing so far advanced that the moment between running
well and running poorly is like a razor's edge.
He asked me if I had a 'bodacious' (he's in TN) spark knock at
acceleration, and I said yes. He said that would well prove it- if the
engine will only run at a particularly high ignition advance but still
knock, the cam is too far advanced. If I back the crank down to 0*, I
should be able to reset my ignition timing to a more appropriate level,
which will eliminate the knock!

I say again, WOO HOOOOO!!! I'm tempted to add a "f'n" in the middle
there, but this is a family forum. :D
Tonight I'm gonna go home and strip the nose of the Jeep in prep for
getting that timing set out and repositioned. Finally, the light at the
end of the tunnel ISN'T a train!! :D :D :D


 
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