To answer the Intake manifold:
The B18C2 uses a 2 stage intake manifold.
VTEC actually engages around 4500 rpm. The secondary runners open around 6000 rpm allowing more air to enter the engine.
Was mainly used to improve fuel economy at lower rpms and power up high from what I understand.
Vvvtec made this write up a while ago but it would still apply. Very useful write up and should hopefully help: http://www.ozhonda.com/forum/showthr...on-a-DC2-B18c2
Bookmarks