Procedure?

[Vicoor]

OK, So I've built this flow bench and it seems to do what I wanted it to. Now How do you guys proceed with testing to get the most out of your heads.

checking port and combustion chamber volumes

test flow at different lift points,

start your porting in what areas, etc?

Is there a particular sequence to give better and or quicker results?

What advice do you have for a newbie?

What works for you?

[larrycavan]

[Thomas Vaught]

Thanks for the Formulas, Larry, I am always interested in getting new ones.

Tom V.

[Vicoor]

Thanks Larry for the formulas.

I understand that getting flow velocities right is the way to get the most perfomance.

My goal is to get substantially better performance for My 4cyl Toyota P/U. I'm not racing it so I'm not thinking of getting every bit of potential out of it, but instead extracting what I can get efficiently. The head I'm working with (Toyota 22RE) is known not to flow very well. I'll have to post pictures of the intake port so everyone can see what I am up against.

Sans velocity probes what I've been trying to do so.far is to increase flow while removing as little material as possible. I've been able to gain 16% flow on one port and only increase the cross section marginally. It seems to me this must mean that I've increased velocity substantially as well.

Do you know where I can get tubing to make my own velocity probes? I think it would be good to be able to map the ports this way and give a better view of the dynamics.

[gofaster]

When you're ready to start making changes, I recommend starting at the valve seat, and work your way out in both directions. If you have the luxury of having a spare or "sacrificial" head, it's good to make some extra valve seat rings that can be popped in and out with slight pressure. That way you can test different seat widths, angles, and valve sizes. Beginners tend to start at the manifold gasket and work their way in, that's backwards. The big action is located between just above and just below the seat.



Edited By gofaster on 1184095405

[Vicoor]

gofaster,
that's the kind of insight I'm looking for. I am a beginner, But so far I've stayed away from the manifold end of the port, (well mostly)