Originally Posted by hellosailor
Engine parts can reach extremely high temperatures, well above 100C on the exhaust manifold, and heat tape is not designed for anything near that. You'd have to contact the individual manufacturer to find out how much heat any product can withstand, but I wouldn't pout them on anything that you couldn't lay your palm on.
100C is not a problem for heat tape. Heat tape, depending on the type, working temps. ranges from 150 to 450 F and the jacket will do twice that. This can be an issue with plastic pipes. My wet exhaust hose is rated for 250 F.