Camshaft lobe design

[CamKing]

Penske had some made, back when he was running Fords, and they worked well.
The problem I've had is getting chilled iron lifters made.
A few years ago, I talked to a company in England about making some, but I think the minimum order was something like 25,000 lifters.

[learner1]

Mike,

I'm not measuring it, I'm calculating it, every 1/4 degree of piston movement. When I design a profile for an application, I input Bore, Stroke, Rod Length, Comp Ratio, Valve size, Choke diameter, Desired max HP RPM, and a few other things.

You're using engine/port measurements to calculate the average port velocity. Then you are creating a lift curve to maintain, as best as possible, the average port velocity through out the lift curve. Am i close on this?

[digger]

Mike,

I'm not measuring it, I'm calculating it, every 1/4 degree of piston movement. When I design a profile for an application, I input Bore, Stroke, Rod Length, Comp Ratio, Valve size, Choke diameter, Desired max HP RPM, and a few other things.

You're using engine/port measurements to calculate the average port velocity. Then you are creating a lift curve to maintain, as best as possible, the average port velocity through out the lift curve. Am i close on this?

I wondered if he was talking about velocity in the curtain / valve aperture rather than port itself. Then there would be a transition from where the limiting area changed to the throat csa