I have just posted some results for specialty pistons (tapered, tapered holes, engineered, valved, split piston). The results are general to show you what the curves look like with each type of piston. It should give you a much better idea about what is changing as compared to the standard flat piston (linear Force-Velocity curve). The results are interesting. Some are expected, some are not.

Overall, this is intended to be informational, and is not going to tell you directly which pistons you should or should not buy. That will still be up to you to decide. Many people claim to have benefits, or don't see any benefits to using each of these types of pistons. Maybe now you can see for yourself why you like or don't like some pistons.

High level conclusion: Most of the piston types do SOMETHING. They may or may not do what they are advertised to be doing. If you can take advantage of the piston's characteristics, you can probably make any of them work for you under the right conditions.

https://drive.google.com/file/d/0B-9...SE0/view?pli=1

cheers