Actually Mahle typically uses 4032 (high silicon content) forgings. 4032 allows much tighter piston to cylinder wall tolerance than 2618. There is really only so much you can do to machine in compensation for 2618’s thermal instability, without eventually sacrificing overall stability within...
I wonder if ring and pinion would really need serous break in like usual if ISF'd. If so, does it take longer, require heavier load, or does it take less time?
I had briefly spoken with a racing transmission engineer/designer at a trade show, and he had told me in some instances if the person performing the process is neglectful or inexperienced, it's possible for heat to build to the point of annealing the gear from the friction... anyone care to...
