All of the smog equipment has been removed from my 450SEL engine in my 79 450SLC. In order to get it to run the timing had to be advanced considerably. It runs very well , BUT, the faster I go the hotter it gets. If I hold it at 70 to 80 MPH it will get up to about 112 to 115C. I haven't taken it any faster for this reason.
QUESTION: at what point in timing advance does preignition become a potential problem, ie 10degrees, 20degrees, 25degrees or ???. Is the engine timing and the high engine tempurature related. My timing is advanced 26 degrees.
Thanks for any help on this question.
79 450 SL (sold)
79 450 SLC
88 Lincoln Town Car (its a jewel)