Editing Engine

'''Fusion Engines''' are the powerhouse of a BattleMech and are mounted in the [[Mech Manual#Components|Center Torso]]. 

'''Engines''' provide the power necessary to move a 'Mech and fire its weapons. Unlike internal combustion engines, ''Fusion Engines'' generate power by fusing hydrogen isotopes (<sup>1</sup>H) much like the center of a sun. Despite conventional thought, these ''Engines'' are not potential mini-nuclear explosions. When damaged to a significant degree they will automatically shut down all fusion reactions and power down the BattleMech. WARNING: To override this shutdown process the default button on all ''Engines'' is 'O'.

''Engines'' not only produce power but also have a power loss, which leads to the advent of heat, that needed to be dissipated, thus needing at least 3 '''[[Heat Sinks]]''' to work.
*''Engines'' with a power rating of less than 250 require extra ''Heat Sinks''.
*''Engines'' with a power rating of 275 and higher provide extra slots, that take only ''Heat Sink'' (without consuming additional [[Critical Slots]] on the 'Mech).

==Variants==
Each 'Mech comes with its own ''Standard-Engine'' from stock. This '''Stock-Engine''' defines the maximum power rating of the 'Mechs ''Engine'' upgrades, thus limiting its maximum speed ([[Engine#Restrictions Formula|Restrictions Formula]]).

''Engines'' come in two different variants and a ''Stock-Engine'' may be of either type, depending on the 'Mech model.

===Standard-Engine===
{{Semantic Equipment
|image=Engine.png
|name=Standard Engine
|tech=Inner Sphere
|type=Equipment
|slots=6
|artemis=
|requires ammo=
}}
*Requires 6 [[Critical Slots]] only
*Built for the battlefields, small, sturdy and low-cost, but heavy. A '''Standard Engine''' costs less than a comparable ''XL-Engine'', but weighs about double.
*'Mechs mounted with a ''Standard-Engine'' are less vulnerable:
:: The 'Mech have no portion of the ''Engine'' in their ''Side Torso'' (RT and LT) and can therefore survive the loss of one (or even both) side torsos.
:: Making only the ''Center Torso'' a [[Critical hit]]-zone.

===XL-Engine===
XL stands for "Extra Light", NOT "Extra Large". But these engines ''do'' require more space than the standard engines.

{{Semantic Equipment
|image=Xl engine.png
|name=XL Engine
|tech=Inner Sphere
|type=Equipment
|slots=12
|artemis=
|requires ammo=
}}
*'''Expensive''' - Acquirement costs about triple the amount of a equally rated ''Standard-Engine''.
*'''Lighter''' - Due to the usage of lighter materials, an ''XL-Engine'' weighs only half as much as a ''Standard-Engine'' of the same power rating.
*'''Bulkier''' - Further occupies 3 ''Critical Spaces'' in each side torso, adding another 6 slots to the 6 occupied in the ''Center Torso''.
**'Mech is more vulnerable, for their ''Engine'' extrudes its bulk into the sides (RT+LT). Destruction of 3 Engine Critical Slots results in the 'Mech being destroyed, therefore destruction of either side torso will result in death.

===Clan XL-Engine===
Clan XL engines are only found in Clan 'Mechs. The Clan XL is more compact than its Inner Sphere counterpart, taking up 2 critical slots in each side torso instead of 3. Since it takes the destruction of 3 engine critical slots to destroy an XL engine, a Clan XL can remain operational after the destruction of a single side torso (but not both). A 'Mech equipped with a Clan XL will suffer a heat penalty in both capacity by at 40% and dissipation by again 40% with an additional overall speed debuff (including torso yaw speed) of 20% upon the destruction of a side torso, due to PGI.

=== Light Engine ===
Light Engines are only found in Inner Sphere 'Mechs.  Similar to the Clan XL-Engines, the light engine takes up 2 critical slots in each side torso instead of 3. 
* '''Expensive''' - Acquirement costs about twice the amount of a equally rated ''Standard-Engine''.
* '''Lighter''' - Due to the usage of lighter materials, a ''Light-Engine'' weighs only three quarters as much as a ''Standard-Engine'' of the same power rating.
* '''Bulkier''' - Further occupies 2 ''Critical Spaces'' in each side torso, adding another 4 slots to the 6 occupied in the ''Center Torso''.

===Specifications===
{{:Engine Weight, Price and heat sinks}}

==== Historical Footnote about the Engine Table ====
The Engine weight table does not match TableTop rules, as it includes the [[Mech Manual|Cockpit]] (3 tons), [[Mech Manual|Gyro]] (Power Rating/100, roundup) and an adjustment for required [[Heat Sinks]] up to the maximum of 10 in [[Mech Lab]] for engines rated at less than 250. (See [[FAQ]] for more information)

==Coming to Speed==
'Mechs are restricted on how fast they can go by two factors:
*'''Stock-Engine''' power rating 
*'''Tonnage'''
To calculate the maximum speed of 'Mech use this equation: <br />
(Power rating / Tonnage) x 16.2 = Max. speed.

===Restrictions Formula===
#''Maximum-Engine'' power rating cannot exceed 400 or ~8.5x the 'Mech's tonnage, whichever is lower.
#''Maximum-Engine'' power rating with (round up to nearest 5 or 0):
:*[[Light|Light]] 'Mech = 1.4 x Stock-Engine 
:*[[Medium|Medium]] 'Mech = 1.3 x Stock-Engine
:*[[Heavy|Heavy]] 'Mech = 1.2 x Stock-Engine
:*[[Assault|Assault]] 'Mech = 1.2 x Stock-Engine

'''Note''': Every [[:Category:50 Tons|50 ton]] 'Mech or heavier is therefore only restricted by the multiple of its ''Stock-Engine'' rating, since 8.5x its tonnage will always exceed 400.

====Example: Limitation by Stock-Engine rating====
A [[Hunchback HBK-4G]] is a [[:Category:50 Tons|50 ton]] medium 'Mech and comes with a 200 rated ''Stock-Engine''. The first restriction placed on it is, that it cannot use an ''Engine'' rated higher than 8.5 multiplied by its tonnage (8.5 x 50 = 425). Since no 'Mech can use an ''Engine'' rated higher than 400, the first restriction caps it at a 400 rated ''Engine''.

The second restriction says: the Hunchback cannot use a ''Engine'' rated higher than 1.3 times its ''Stock-Engine'' rating of 200 (1.3 x 200 = 260). This means it cannot use an ''Engine'' with a rating higher than 260. 

Since the max. ''Engine'' is limited by the lower of the two rules, the highest ''Engine'' the Hunchback can use is a 260 rated ''Engine''.

====Example: Limitation by tonnage====
The [[Cicada CDA-2A]] is a [[:Category:40 Tons|40 ton]] medium 'Mech and comes with a 320 rated ''Stock-Engine''. The first restriction placed on it is, that it cannot use an ''Engine'' rated higher than 8.5 multiplied by its tonnage (8.5 x 40 = 340). 

The second restriction says: the Cicada cannot use an ''Engine'' with a rating higher than 1.3 times its ''Stock-Engine'' rating of 320 (1.3 x 320 = 416 rounded down to 415). Since no 'Mech can use an ''Engine'' rating higher than 400, the second restriction limits it to a max. ''Engine'' rating of 400. 

Since the max. ''Engine'' is limited by the lower of the two rules, the highest rated ''Engine'' the Cicada can use is a 340 rated ''Engine''.

===Table: 'Mechs Power Ratings, Maneuverability and Stock-Cost===
{{Engine Ratings Table}}

==References==
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{{MechWarrior Online Wiki|selected=Equipment}}

[[Category:Equipment]]