I just timed it. Steering engines are going down in 12-13 seconds and main engine in 20-21 seconds.
Ok, I wasn't happy with the data so I timed the damage taken by both types of engine several times, using kerosene, moonshine and tar, and averaged the results. The time it took for the steering/main engines to go down and calculated damage taken were, on average, as follow:
Kerosene - 31.44s (314.4 HP) / 54.41s (544.1 HP)
Moonshine - 11.04s (331.2 HP) / 18.75s (562.5 HP)
Tar Barrel - 12.96s (324 HP) / 22.15s (553.75 HP)
From this data it's possible to infer that the steering engines have around
325 HP and the main engines around
550 HP. Moonshine probably had higher results because the last hit to the engines does much more than necessary damage.
The results are so close together, with each tool working less than a second more or less than the other (which accounts for human error), that I can only accept that the damage is actually working correctly and I'm the one with incorrect feelings about them.
My second hypothesis is that maybe there was a bug
before, causing it to deal less damage, which has now been incidentally repaired.