Hey guys, need some help with a turbo plenum chamber please

[benno505]

I got a friend that wants me to fabricate a new efi turbo plenum chamber for his slant 6 motor.
anyone got any tips or design parameters that I should work off, don't know a lot about them.

Much appreciated

[HellPhish89]

http://horsepowercalculators.net/int...anifold-design

[Stilettoman]

I just started a thread about my Studebaker project and have not yet got to the engine in my writeup, but I wanted something that looked more period correct than the stock intake on my Skyline straight six. My fabricator, Sean, who has built a lot of turbo systems, suggested that an old style cast valve cover would be about the right size and shape, and I found one with the Studebaker name cast in. It works perfectly for a turbo system because we put the throttle body on the front end with the intercooler inlet coming from in front of the radiator. Not going for more power, just did this for appearance reasons. Notice that the lower manifold is not modified.

The big boys with the high dollar super cars are using velocity stacks in their plenums - the designers say they get better flow if the inlets are raised up off the floor of the plenum. They also like to stagger the height of the stacks so they don't all draw from the same level in the plenum. I found a piece of very soft aluminum tubing with inside diameter EXACTLY the same as the runners in the lower manifold (I think it was a section of tubing used for 707 fuel lines, complete with Boeing part number and early 70s date). We made a set of dies on the lathe and formed the velocity stacks, welded them into the bottom plate, welded the throttle body flange into the valve cover and then welded on the cover. No one will ever see the velocity stacks, but the photos make a nice conversation piece, don't you think?

The idle air controller, cold start valve and a couple of vacuum fittings are mounted to the bottom of the plenum to reduce the cluttered look in the engine compartment. Hopefully all this will give you one or two useful ideas.

[Twentyover]

I just started a thread about my Studebaker project and have not yet got to the engine in my writeup, but I wanted something that looked more period correct than the stock intake on my Skyline straight six. My fabricator, Sean, who has built a lot of turbo systems, suggested that an old style cast valve cover would be about the right size and shape, and I found one with the Studebaker name cast in. It works perfectly for a turbo system because we put the throttle body on the front end with the intercooler inlet coming from in front of the radiator. Not going for more power, just did this for appearance reasons. Notice that the lower manifold is not modified.

The big boys with the high dollar super cars are using velocity stacks in their plenums - the designers say they get better flow if the inlets are raised up off the floor of the plenum. They also like to stagger the height of the stacks so they don't all draw from the same level in the plenum. I found a piece of very soft aluminum tubing with inside diameter EXACTLY the same as the runners in the lower manifold (I think it was a section of tubing used for 707 fuel lines, complete with Boeing part number and early 70s date). We made a set of dies on the lathe and formed the velocity stacks, welded them into the bottom plate, welded the throttle body flange into the valve cover and then welded on the cover. No one will ever see the velocity stacks, but the photos make a nice conversation piece, don't you think?

The idle air controller, cold start valve and a couple of vacuum fittings are mounted to the bottom of the plenum to reduce the cluttered look in the engine compartment. Hopefully all this will give you one or two useful ideas.

Very clever idea. Nicely done

[alphaenvirmgt]

Way cool!!!