- #1
USMC8541
I need some help.
I would like to design a custom intake for a 8 cylinder IC engine.
some back ground information.
All cylinders are fed by a length of pipe with a tapering crossectional area (intake port). All 8 intake ports are connected to a common plenum.
What I am trying to accomplish is to tune the pressure wave in the intake port to arrive at the intake valve at a pre determined moment. The reasoning is if the + pressure wave arrives at the valve just before the valve closes the momentum of the air will continue to flow into the cylinder aiding in volumetric efficiency.
I am having a rough time developling an equation or method using crossectional area, varing crossectional areas, pipe length, and plenum volume to accurately predict the frequency of the + positive pressure wave.
If I haven't given enough background information let me know or ask me what you need to know and I can go more indepth.
Todd
I would like to design a custom intake for a 8 cylinder IC engine.
some back ground information.
All cylinders are fed by a length of pipe with a tapering crossectional area (intake port). All 8 intake ports are connected to a common plenum.
What I am trying to accomplish is to tune the pressure wave in the intake port to arrive at the intake valve at a pre determined moment. The reasoning is if the + pressure wave arrives at the valve just before the valve closes the momentum of the air will continue to flow into the cylinder aiding in volumetric efficiency.
I am having a rough time developling an equation or method using crossectional area, varing crossectional areas, pipe length, and plenum volume to accurately predict the frequency of the + positive pressure wave.
If I haven't given enough background information let me know or ask me what you need to know and I can go more indepth.
Todd