Engine dyno software. Anything good on the Internet?

I'm all for rounding off 1% on a simulation, but that's not what I'm talking about.

But for example the difference between a 230 @ 0.050" hydraulic cam
and a 230 @ 0.050" solid cam

... is HUGE.

I once read something to the effect of "When changing from a hydraulic to a solid cam, add 10 degrees @ 0.050 to get similar valve timing to compensate for lash"

The range of duration in typical aftermarket cams from mild to wild is quite small.

For simplicity's sake

So let's say that a small cam is 200 @ 0.050"
and an extremely large cam is 270 @ 0.050"

70 degrees. from (more or less) one extreme to the other.

If the simulation is ignoring that (approximately) 10 degrees @ 0.050 that is taken up by lash with a solid cam, the entire torque curve is going to be balls up.

Just my opinion.

Yes you are correct in the differences in hydraulic to mechanical .
http://www.hotrod.com/how-to/engine/mopp-0312-solid-vs-hydraulic-lifters/
I do also think that a little more could have been done to keep the hydraulic under control in the upper rev ranges, but this test does touch on the timing difference between these two cam types.
Oh yeah, and screw Apple too...I'm glad they never got a good foot hold in the computer market , otherwise we'd all be paying though the nose every time we turned on a computer.