I have heard of pilots using carb heat on takeoff in -40C outside conditions to reduce power to within engine limits.
I once did a takeoff in a C150 in about -20C. After a long pre-heat, the mechanic pumped the primer while the apprentice pulled the prop.
When taxiing in a couple days before, I noticed that each a/c in the tiedowns had on a engine blanket and an extension cord coming out. I felt quite naked seeing that
Bearing clearances can go negative in these temperatures; so preheat is vital.