Hey guys I'm doing a d15b build it's my first one and I wanna put a supercharger on it and not a turbo cause I wanna keep the ac in my Crx I'm going to build the head and tranny and put aftermarket internials but my big question is do I put low or high compression pistions I say low and the pistions I'm outing in are going to be coustom made by bisimoto but they need the compression I want and the ratio so what should I do

 

The most common compression suggestions for JRSC supercharged motors are in and around 10-10.5:1 compression.

Have a read:

https://honda-tech.com/forums/forced-induction-16/%2A%2A%2A-official-jrsc-thread%2A%2A%2A-1214810/

It's long, but you'll learn a ton about supercharging a Honda with the JRSC stuff.

 

WHAT's valveover lap