What is the defining factor for fork travel?

I am currently not riding a carrera sulcata due to headset issues(see another post) but for a while have been wondering if i could change the fork to a longer travel one. This i know has to do with the head angle and other things but i am currently riding a rockshox xc32 with the frame and was wondering if the frame would accept a 120mm fork or even a 140mm.
Probably a very stupid question
thanks in advance
Probably a very stupid question
thanks in advance
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Too long will mess up the geometry, as well as putting additional stress on the frame. So it might snap and you will die.
Not an ideal result.
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I wouldn't say it was a hard or fast rule though, it must be bike dependant, but as above, the more you change the length the more the geo will screw up and the more risk of damage to the bike