DCT=Bob wrote:____ Once you go-ahead & install the AAU in the one position which will cause the points-cam to position it's lobe-ramp so that the points have just-become pretty-much fully opened,, then yes, that's the 'correct' timing !
" this is the one thing that still isn't clear.
SO it seems to me that both positions fit the descriptions given for the correct position. "
____ Actually, if ya pay good/close-attention to all the words in my carefully well-worded sentence, then it should be fairly quite clear exactly what I had meant !
However if that sentence of mine merely read as:
' install the AAU in the position which will cause the points-cam to position it's lobe so that the points have fully opened,', THEN your concern would've made reasonable-sense and been quite valid !
I guess I should've bold-ized all the wording which you seem to have overlooked, and posted it rather as follows...
"install the AAU in the one position which will cause the points-cam to position it's lobe-ramp so that the points have just-become pretty-much fully opened," ... You-see "just-become" means that the points have just-then opened,, whereas with the AAU reversed, the points then would've already been fully opened for a considerably more significant time ! _ And "pretty-much" -(a commonly-used American term) means 'near-about' or 'almost'', which was meant-to indicate a slight bit less than the FULLY fully-opened position found in the MIDDLE-section of the cam-lobe.
" One of these positions the corner, the opening edge, of the lobe, at 2 o'clock. "
____ That's the correct orientation, (and the "corner"/"opening edge" of the lobe is called the 'ramp') !
" The other has the bulk of the lobe facing to the right. "
____ Indeed that's certainly the case when the AAU/lobe is in the wrong-position (and the points have been long opened FULLY) !
[Quote= Jordan ...
" it's just a matter of seeing when the points are just at the point of opening.
That is a little different to how Bob described it (fully open). "
____ Actually I had stated: " 'pretty-much' fully opened", and-thus really meaning fully separated-open (rather than having achieved max.lift) !
This is because the ign.spark doesn't wait to fire-off right-at TDC (along-with the full-alignment of all the timing-marks), so-thus the points will rather have already been opened-apart and near the peak of the lobe-ramp by the time of TDC !
" You need to take into account the direction of rotation, otherwise you might use the wrong side of the cam ramp. "
____ Good point (to provide for newbies) !
Dukaddy-DUKEs,
-Bob