"The overheat ratio % determines the maximum overheat a certain engine can go." No it doesn't. The maximum overheat cap is always 1.7 times your cruise/base speed (except for subs, which are apparently capped at 40 knots overheat, also when having a cruise speed above 24 knots). The %, both for the ship hull and the engine, determines how much ability you need to hit the cap. This means, that with a boat like the Oyodo, which has a somewhat high overheat ratio, you can add a 120% engine, and probably, if not almost, speed cap it without any engineers at all. This means, that if you have a low level crew, or a crew with few or no engineers, you will almost always be best off by chosing the engine with the most HP and 120%, whereas if you have a good BB crew with many engineers, there might sometimes be a better alternative, although it doesn't happen very often. An exception is the H39, where the most people use the KM BB Engine III, which has 120%. However, if you have a semi fat crew, you can't get the H39 to 42 knots, when stripped of AA, because the engine is too heavy. But, if you change to the PS Engine II, which has the same ammount of HP, you can actually increase your speed from 40 knots to 42 knots, because you save enough weight to raise the cruise speed from 24 knots to 25 knots. As the engine only has 96 % overheat ratio, or whatever you want to call this, it of course means it will require more of your engineers, but if they can manage to hit the cap, it will be a better option.
In the case of the Oyodo:
CV VI - Heavy 100,100 HP (120%) 1320 ton - This engine is too heave, with too little HP. The overheat ratio (120%) means you can cap it without engineers, but it doesn't make up for it.
CA III - Heavy 112,200 HP (84%) 1100 ton - This engine has a better overheat ratio than the CL III engine, but is also a little heavier and has a little less HP. If you don't have any engineers, this could be an alternative to the CL III engine.
CL III - Heavy 121,000 HP (66%) 660 ton - This engine is the most powerful, and also by far the lightest engine, but its overheat ratio is also the worst. This means, that if you don't have any engineers, this will go up against the CA III engine almost equally. However, if you have a good engineer on your Oyodo, this will be deffinately be your engine of choice.
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