Originally posted by: Actaeon
Honda's F20C1 (2000-2003 Honda S2000) is absolutely fantastic. 9,000RPM redline, 120hp per liter, it is an amazing piece of engineering. Closest you can get to a Motorcyle motor in a vehicle.
GM's LS1 series is great as well. Very light (for a large v8) and tons of power. The LS2/LS6/LS7 are even better. The LT1 was a great engine, but the LS1 was so much better.
The new HEMIs are pretty sweet, about the same as the LS1. Tons of power.
Gotta hand it to the Rotarys as well (B13, RENESIS). While they don't make an amazing amount of power, just the way it works compared to a conventional engine is amazing. Very compact and light too.
The VQ35 is okay, not amazingly powerful or efficient, but makes pretty good power for a 3.5L v6. Not too many 6 cylinders get that much power from that much displacement.