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Post 5
"i don't know"
Post 6
"i think they are wrong"
Which one is it, it can't be both?
My understanding is at low RPM one intake valve opens normally, the other barely opens. The combination creates a swirl which enhances atomization and allowslean burn at lower revs. VTEC enagages at 2500 RPM to allow more power when needed. Lean burn engages at higher manifold vacuum. This allows mixtures to be very lean but it is a very sensitive area as far as loads, throttle position, as well as any other condition such as clogged egr ports, ignition problems, even dragging brakes, all acting together to push the car out of lean burn. Even tire choice can affect lean burn operation. When I changed the ORIGINAL tires on my 94 VX in 2008 at 37 k ORIGINAL miles the averge MPG dropped by 7 MPG, just from the tires.
An argumentive postion and responses is not condusive to "learning" and you have access to some of themost knowledgeable VX owners and techs on the planet right here.
The only way you can fail to learn is to not believe the truth when it is staring you in the face and that is your choice.
regards
Mech
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