Jay Leon Hart, on 14 January 2017 - 02:17 PM, said:
So, in the lore, it explicitly states that Inner Sphere 'mechs using an XL engine from any manufacturer will cease to function upon the loss of a side torso and all components contained within? I'm genuinely asking.
In lore, there is no such statement. But remember, lore primarily based upon the novels.
In Battletech rules, however, IS mechs have XL engines that take 3 slots in each side torso. Clan mechs have 2 in each side torso.
EVERY engine has 3 points worth of 'shielding.'
Critical hits are those that damage the internal (under armor) components of a mech, which include weapons, ammo, gyro, sensors, and engine. If, when rolling for damage, a critical hit is counted on the engine, the engine loses 1 point of 'shielding.' Note, the skeleton of the mech (internal structure) has a number of hit points like the (external) armor, and when the internal structure takes enough damage, the entire limb, torso section, or head takes enough damage, that part is said to be blown off.
When a mech takes 1 critical hit to the engine, it gains 5 access heat per round. On a second critical engine hit, it gains 10 access heat per round. On the third engine critical hit, the engine shuts down and cannot be restarted.
Because the IS XL engines take up 3 slots in a side torso, eliminating the internal structure of that torso destroys that torso, also doing 3 automatic critical hits to the engine, shutting it down. Clans, having only two slots in each side torso can survive losing a torso (if they haven't taken critical hits to their engine outside that torso already), though the mech will have an additional 10 heat per round after the loss of the torso.
Additional heat affects the targetting and movement of a mech, and there's a whole heat scale chart you check at the end of every round. However, if you have enough heat sinks, even with the damage, you can continue to function as normal. For example: if a Warhawk has 20 double heat sinks, loses a side torso along with 5 heat sinks, let's say, it still has 15 double heat sinks soaking 30 heat per turn. So, losing a side torso would only affect the performance of a Warhawk if it fires more weapons than available heat sinks.
This is not the same in MWO. In MWO they take what they want from the rules and discard the rest. My only beef with that is they also use lore as an EXCUSE not to make good changes to the game as well.