pre plenium

[TTmotors]

In the intake manifold design im working on. I need some equations for inline helmholtz resonator systems for increasing the volumetric efficiency of the engine. What I mean by inline is that it goes from the ram pipe(CAI intake tube whater)the throttle body connected to the helmholtz chamber then is channeled into the plenium. (its a packaging issue)

Any help would be much appericiated.

 

[etatv]

SAE has a book titled "Design Techniques for Engine Manifolds" that should help you find what you are looking for.
ISBN # 0-7680-0482-9

 

[GregLocock]

I'm a bit puzzled by this - we use Helmholtz resonators to take energy /out/ of the intake. There again ours are side branches, not inline. This also puzzles me.

Cheers

Greg Locock

 

[TTmotors]

Well i stumbled across an article on inline helmholtz systems and decided i wanted to try it and see what kind of efficiency I could get out of it. Also has either of you experimented with putting the Mass airflow sensor after the throttle body for improved throttle response? The idea seems good as long as packaging isnt a problem. But iv ran into articles stating you need 10-20 pipe diameters of length before the maf in order to "stabilize" the air. In a design like mine with a helmholtz resonance chamber before the plenium it would seem like i could design the volumn of the chamber around the diameter/length of the maf in order to still get it to resonate at the proper rpm to supplement the torque curve while having the metering device respond to pressure (air velocity) changes faster and more accuratly for a better throttle response.

Any ideas on this or am i just way off?