Quote Originally Posted by BlitZ View Post
a b series and a d series is completly different in design.. that is what im looking for....

essently a b series will run high comp and different head...
b series twin cam vtec... which is not available in d series..

and that would be why it is making more power..

You can increase the compression of the D using aftermarket pistons. D series also came in DOHC but without VTEC. VTEC doesn't make power. The cam specs do. If you had a DOHC D series with aggressive cams, balanced internals and I/H/E/ECU to match, you can make more power than a stock B16a.

All VTEC does is let you use lumpy highcams while keeping conservative lowcams so that the car remains drivable at low RPM and returns good fuel consumption.