Jeg mener at nb og nbfl har samme kompression men at det var tændingen der blev retarderet vha sprit. Så det faktisk var VVT der var problemet. Men jeg tager måske fejl.
Vedr. Bp-4w fra wiki.
The BP-4W engine remained at 1.8 L (110 cu in) but received several minor updates. The engine compression ratio was raised from 9.0:1 to 9.5:1 by adding slightly domed pistons; the intake cam was changed to a solid lifter design with a stronger cam; the intake runners in the head were straightened and the intake manifold was mounted higher up. Mazda's Variable Intake Control System was introduced, which effectively gave a long narrow intake manifold at low rpm for better swirl, changing to a short, free-flowing manifold at high rpm for maximum breathing. Power output of the new engine was quoted at 104.4 kW (140.0 bhp) with 116 lbf·ft (157 N·m) of torque.