BTW Version: 2.96
Buildcraft Version: 2.2.1
Mechanical Engine: BC engine powered by mechanical energy from the back. This is a stable engine that never explodes and always outputs the same energy.
Recipe: Same as BC redstone engine, but with BTW gearboxes instead of wooden gears.
Download: http://www.mediafire.com/?3yxikjfmlj933gd
Old post:
I have a working BuildCraft/BTW mod that allows you to power redstone engines with mechanical power to get higher energy yield
Phase two will be biofuel. You throw wheat/hemp, sugar and charcoal into a refinery block, which generates BC fuel. I need to work out a few details for this, so it'll be a second release.
I'm about to release this, so I thought I'd get some feedback first. If everyone likes the idea, I'll release it. I'm probably throwing up the prerelease tonight.