Tim Dodd, the Everyday Astronaut, is active on twitter with Elon and they, along with Tory Bruno, had a discussion of rocket engines and engine dynamics.
Everyday Astronaut on Twitter
And here is a link to a great comparison of orbital rocket engines:
Comparison of orbital rocket engines - Wikipedia
Everyday Astronaut on Twitter
And here is a link to a great comparison of orbital rocket engines:
Comparison of orbital rocket engines - Wikipedia