Tuned intake length 3

[Rat5]

Hello, here's a formula that was provided by someone on the web. We keep arguing. I think it is complete nonsense.

What do you think ?


L=10.Cs/n[1/(K/(1-(1.62 u/Cs S/Ac)^2))+((1-K)/(1-(1.62 u/Cs S/Ac 2/(Amt/Ac+1))^2))]

L: runner length
S= piston area
u= average piston speed m/s.
Ac= intake runner cs area
IMc= about 0.25.
K= harmonic number
Cs= speed of sound m/s.
n= engine speed

 

[Tmoose]

Hi Brian P,

"In my case suggests that the tuning RPM is around 11,000 ... which is about right for my installation ...."

" It's healthy. Pulls all the way to redline. It's a little soggy below 7000 rpm,........."

Still with Intake lengths similar to the simplifed pencil work by Chrysler engine-eers back in the 60s ?


thanks,

Dan T

 

[SomptingGuy]

The good books for this stuff are those by Winterbone & Pearson:

"Theory of Engine Manifold Design: Wave Action Methods for IC Engines"
"Design Techniques for Engine Manifolds: Wave Action Methods for IC Engines"

Worthy additions to any automotive engineering library.

Steve