Funny thing is that you make them in furnace so they should be quite hot when they are ready
Also fluid ethanol would make it kinda more interesting to use (we don't have any low-level engines in other mods that use liquid fuel)
But anyways, lots of "realism" is not really needed. Realistic heating and cooling? I don't think it would be noticeable if the model was more simple. And funny thing is that if you put a steam engine heated by lava and a cooling fin on it, engine will have the temperature of ~120C while fin will be at ~20C. So, how does it cool the engine then? Realistic cooling model, but such bad mistakes.
My problem is that from my experience, RoC steel is the easiest to make (maybe except for mekanism one) and you usually make a lot more RoC steel than other kinds of steel.
It's more like "I don't want to go through all the RoC stages to use a bit of its stuff". I don't think that mod should fight players by forcing them to make certain stuff or go through every parts of mod. It's a Gregtech stuff when you are basically forced to play gregtech if you want to do anything.
Once again, sorry, it turns out it's not you, but I didn't read your post deep enough and took it as offesive.