Intake Manifold

[Helliouse]

Hello all,
I have been toying with the idea of generating swirl with in the intake manifold runners in stead of the swirl hump in the head.
The question is will this generate enough swirl to keep our engines happy? Or will it only create a wash of turbulence when passing through valve?

Another question unrelated to Intake manifolds...How many lb/inch does it take to move the veins in the VNT turbos?

Thanks for any input

Brad.

[410]

The answer to your unrelated question.  When the vanes are clean on a vnt it takes no effort to move them, like .1 in/lb maybe.  When they are dirty they can be quite difficult to move.  The vanes can get to a point where they cannot be moved at all without excessive force.

 It's an issue that I am currently dealing with my m-vnt setup.  Everything works great after I clean the turbo out but quickly run into problems like boost spiking too high within a couple of weeks.  I drive a lot of short trips so this aggrevates the problem. 

[Helliouse]

I am asking so I know what linear actuator to buy.
Buy a 10lb one, or is a 5 lb one going to work well...My concern was when it get clogged up. But I will have it move the fins on start up and shutdown to help keep it clean.

[Pat Dolan]

Brad:

Doing anything in the inlet manifold would be a waste of time.  What the 8v engines DO need is a lot better inlet for just plain flow (or are you going 16V??).  The porting does the swirl, but it is not related to the flow in the port, but the flow in the CHAMBER (i.e. same axis as rod).

If you want the simple, quick answer as to what forces are needed and what are considered "enough", just measure the diameter of the actuator, calculate the area and stick a vacuum gauge on the line to find the pressure available.  There's you number.