Mild 318 pinging

Mild 318 pinging

:thumbsup:

1973dust said
I wasn't sure how many strokes to max is normal.

Pick a number between 3 and 5, or as you observed if the cranbking rpm is dropping, then it may take another compression stroke or two to get max out. As long as you have notes and its repeatable test method, that's fine.

1973dust said
I ended up having to live with 8 initial timing for now as I still was having some slight pinging at wot. I've made several wot runs from about 25mph up to 65mph in 2nd gear with no audible ping. I also adjusted the vacuum advance to pull in 2 degrees less timing at 16" vacuum which ended up being 1 1/4 turn ccw. I figure I could probably bump the initial timing at least a couple degrees if I ever get a 3.23 rear.

If that engine likes a little more initial then this

I think I see now why it's recommended to weld the inside of the slots rather than the outside so the springs start out with a little more tension.

would be the way to accomplish that using the same springs.

Roughly sketching out the new timing set at 8* initial, its not too surprising it was pinging a little with more initial.

If you're satisfied where its at now, great.
If at some point you want to or find you have to get back in the distributor, welding up the inside is one adjustment, and engaging the long loop spring earlier is another. (Or try to find a slightly shorter, heavier long loop spring). I think you see that they do different things.