Quote:
Originally Posted by Brian Carlton
See my amended post #31.
I realized that the spec is at 1000 rpm and my tests were all done at 650 rpm. That is the most likely reason for the discrepancy of four degrees.
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With the non turbo you have the fast idle knob which probably helps with the 1000 rpm vs idle problem.
I'm not sure that the discrepancy of 4 degrees can be explained by a difference in 350 rpm though. The timing device alters a maximum of 7.5 degrees (was 6 degrees for the pre-1980 non turbo engines). I don't think the timing device is meant to do anything below 2000 (may be 1800) rpm - so that's about 1 degree for about 400 rpm ( {5000 rpm - 2000 rpm} / 7.5 degrees )