Optimal Crucible to Magmatic Dynamos ratio
Solution 1:
Depends on what you use to heat up the crucible the complete list is here
http://ex-nihilo-minecraft.wikia.com/wiki/Crucible
if you use lava, it will produce 4 mb/sec of lava per crucible which is 0.2mb/t, and if the dynamo produces 180,000rf per 1000mb of lava and is producing this at 120rf/t then it will take 1500 ticks for it to use a bucket of lava so which is 0.6mb/t meaning you need some ratio of 1 dynamos with 3 crucibles
but if you use fire it produces 6 mb/sec which is 0.3mb/t which would be 1 dynamos to 2 crucibles
sorry my math was wrong first time, I know it seemed off just did 1 division wrong should have double checked but hey it's fixed now