Timing 1986 220 Crusaders

[jwitto1]

I cannot see the timing marks on my engine, does anybody have a picture of it. I think I set it at 6,sounds good but I want to be sure

 

[RicardoMarine]

Kim, I can agree with that, but with one possible caveat.
IMO, 4k rpm is rather late to be "full in" for a SBC Marine engine.
To begin with, and IMOO, 26* @ 3.2k rpm is rather conservative.
If she's 26* full in @ 4k rpm, what is she actually doing @ 3.2K rpm?


Jwitto1, your most important thing here, will be to establish an accurate #1 TDC, and then the corresponding degrees that follow.
Without this, you'd basically be guesstimating your advance.

If you now have no TDC markings, you may end up doing a PPS (positive piston stop) procedure.
It's actually very simple to do, and it may take you 45 minutes or so first time around.

Jwitto1, Kim is dead on regarding "Base timing is not as important", and as for laying out the curve and it being fairly linear.
You could use increments of 500 rpm, or even 250 rpm.

Find your 1986 Crusader OEM advance curve specs, and compare your actual advancing numbers to it.

This is just too dang important to NOT give good attention to.
It can make the difference between good performance and poor performance, and/or Detonation or NO Detonation risks.


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Jwitto1, this is an example only of what your OEM advance curve will be similar to.
Note that the BASE or Initial advance is not shown in the vertical scale to the left side.
IOW, BASE or Initial advance must be added to the curve line values, in order to learn what your actual dynamic readings will look like.

Pay zero attention to the blue line (that was used for a Chrysler 318/360 advance curve comparison)

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