Intake Design Exploration

[vex]

Originally Posted by tervo rodriguez

here is a look at my custom intake that positive pressure comes in at 2200k w/webbers dcoe 45 on 13psi boost at 3200k and puts out 322 to the wheels 360hp on my raceported 12A

Your plenum and intake are simple enough. Though I don't think your runners can readily be seen in the pictures you provided (since you're running a carb the runners would be underneath the carb).

Though I must say, I really like the way your plenum is set up. It looks somewhat similar to my first attempt to digitally model the intake, though I didn't place the blow off valve on the plenum. I like the thought of having the vac/boost lines coming off the plenum. Do you run into any issue with pressure sensing with a turbulent flow? I suppose you really wouldn't because stock does the same thing.


As for the code generation for calculating intake runner length and diameter I have some good news to report:


I've also included the code below for further investigation for users who wish to run it themselves and maybe even critique my math. I wrote it in matlab which allows easy 3d surface rendering accurately.

function []=runnerlength()
gamma=1.4;
R=287;%J/kgK
T=293.15;%K

a=sqrt(gamma*R*T);%M/S

redline=8000;%rpm redline
v=0.0013;%m^3
r=linspace(0.001,0.015,100);%m
A=@(x)pi().*x.^2;%m^2

rpm=linspace(3000,10000,100);
f=@(x,y)a.^2.*A(y)./(4.*(x./60).^2.*pi().^2.*v);
z=zeros(length(rpm),length(r));
for i=1:1:length(rpm)
    for j=1:1:length(r)
        z(i,j)=f(rpm(i),r(j));
    end
end

surfc(r,rpm,z)
colorbar
xlabel('Radius, r (m)')
ylabel('RPM')
zlabel('Length (m)')