- :
- Hemi Ram, 71 Plymth Scamp, 71 Plymth Duster 340, 69 Dart 340/4sp
Paul said:
Cel was my fault. It is stronger, the loss of boost was caused by loss of restriction.
Butterfly Valves Open or No? Dyno Proven
- Thread starter Paul
- Start date
Cel was my fault. It is stronger, the loss of boost was caused by loss of restriction.
flat_black
Member
Okay, guys... I just spent a bit drawing up an explaination of all this stuff...
Essentially, there is a plenum, the runners, and a resonance chamber built into the plenum. When VTCS is engaged, it creates tumble in the airflow (the lower half of the flap is cut out to allow air to get through, anyway), which allows for a more turbulent, hotter burn, igniting the pre catalyst faster. When disabled after the car has reached the warmed up temp, though, the air flows basically normally after the VTCS butterflies open up, save the little bit of turbulence and restriction added by the VTCS butterflies, the one just in front of the head.
VICS, Variable Inertia Charging System, when engaged, increases the overall volume of the intake manifold, and speeds the air in by means condensing then opening the air pulses drawn in by the engine, something like a venturi effect, but rather using inertia gathered from the intake pulses, and packing them all into the sub-plenum, then pumping them out, under the other half of the airflow that doesn't get diverted.
The engine does NOT technically have two sets of runner, in the normal sense, where both runners draw from one plenum, but it creates the effect in a rather interesting way.
The pictures posted with this should explain it a little better, visually.
Essentially, there is a plenum, the runners, and a resonance chamber built into the plenum. When VTCS is engaged, it creates tumble in the airflow (the lower half of the flap is cut out to allow air to get through, anyway), which allows for a more turbulent, hotter burn, igniting the pre catalyst faster. When disabled after the car has reached the warmed up temp, though, the air flows basically normally after the VTCS butterflies open up, save the little bit of turbulence and restriction added by the VTCS butterflies, the one just in front of the head.
VICS, Variable Inertia Charging System, when engaged, increases the overall volume of the intake manifold, and speeds the air in by means condensing then opening the air pulses drawn in by the engine, something like a venturi effect, but rather using inertia gathered from the intake pulses, and packing them all into the sub-plenum, then pumping them out, under the other half of the airflow that doesn't get diverted.
The engine does NOT technically have two sets of runner, in the normal sense, where both runners draw from one plenum, but it creates the effect in a rather interesting way.
The pictures posted with this should explain it a little better, visually.
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