jbanes1961
Member
Does anyone happen to know what the ignition timing is on a stock 212 hemi. Ive read anywhere between 20 and 24 degrees....
Using a degree wheel, with a positive stop, and finding top dead center, is such a rudimentary task, I'm sure you're doing it right. So, assuming you have top dead center right, and things are not coming out right, perhaps there are other things not aligned properly and that's making you feel like you're not finding top dead center correctly. You think? Tight quality control is expensive to maintain, maybe that's why the Chinese can sell engines for 1/3 the price, no quality control?So im assuming your telling me the only true way to find the timing is to check with degree wheel. Ive tried that on different engines and i find i keep getting varied results, not sure why, im using a piston stops and doing it the way it was outline in what appeared to be a good video.
That peak my interest, so I went to my CAD/CAM program and drew it up. If the piston had .006" of clearance, and you measured all the way out on the edge of the piston, a piston straight up and a piston rocked at an angle, changes height, again, right at the edge of the piston, .004". Now that's right at the edge, as you go closer to the center, that number gets smaller. Now, a piston travels, in a clone, from 35° to 36°, .011". That means .004" difference would be about a 1/3 of a degree. And like I said, the closer you get to the center of the piston the smaller that .004" number gets. I just went back and checked. At about a 3rd of the way to the center of the piston, that .004" becomes .0028". That would be less than a 1/4 of a degree. Now I understand, like me, we all strive for perfection, and there's nothing wrong with that, but we don't want to get too anel.If using a piston stop... in these engines... a loose piston/rings...will provide piston rock... possibly compiling mixed results...
The rules for stock Preds at the track I run are stated something like this.
16 degree advance max.
offset key can be used to advance or retard timing, but must not be any more than 16 degrees advanced.
Knowing the inconsistencies of the predator right out of the box, one could assume that you could find one with as much as 20 degrees advanced.
you could also potentially find one with only 12 degrees advanced or anywhere in between.....or More..... or Less.
That's the word around here anyway.