Don Terrill’s Speed-Talk

Another option is to buy a CNC mill. You can buy a very nice one for much less that $150K It has the advantage of being able to make a 3D shape rather than only a revolved shape. A CNC mill also has the advantage of versatility, if you design a part, it can be producing 24x7. Curious What machine w...

One experiment worth doing regarding swirl on 2 valve heads is, make a mold of your port, then use that to make a port that is on the center of the bore, no chamber. I have tested that on a few heads that were supposedly designed for swirl, they had no significant swirl, it was all in the chamber. ...

One experiment worth doing regarding swirl on 2 valve heads is, make a mold of your port, then use that to make a port that is on the center of the bore, no chamber.

I have tested that on a few heads that were supposedly designed for swirl, they had no significant swirl, it was all in the chamber.

Doesn't that carbon cleaning land big chunks of material in your cylinder to trash, well everything?

Thanks for the answer and syringe example, but it raised another question. Should the coefficient of discharge of the curtain area be taken into account when considering whether the flow through the valve reaches the piston due to velocity? Probably, although not necessary. Also the intake/cylinder...

Doesnt that shape require the filling to happen faster than the piston moves away from underneath? If the intake pressure is barely higher than the cylinder, i would assume the cylinder doesnt fill much more than what the piston is asking for during that time :-k -juhana That would be right if the ...

The toroidal shape of the flow in the cylinder starts as soon as the piston moves away from TDC.
Since the area of the piston is greater than the curtain area, the flow velocity is greater than the piston velocity.
So the momentum is circulated.

They could’ve been completely stagnant, their current product line. While paying attention to keep people doing R and D area. They couldn't afford enough R&D to get to the cutting edge. The machine shop was a much bigger problem, you could design great parts but they couldn't make them. The scr...

289nate wrote: ↑Sat Nov 04, 2023 2:07 am Edelbrock is a disaster.

The problem is the industry/market is not profitable enough to justify the cost modern equipment and skilled employees to improve on OEM designs on the high end, or manufacturing efficiency on the low end.

We were fortunate enough to enjoy some good times.

I don't know who did the the CAD work on the Pro Max head foundry tooling, but it is some of the best work I have seen.

We considered improving some foundry tooling at Edelbrock to make them even but they didn't want to spend the money.

Erland Cox wrote: ↑Sat Oct 14, 2023 4:30 pm Probably this: https://www.youtube.com/watch?v=nuQyKGu ... A3&index=5

Erland

Yes

Erland Cox wrote: ↑Sat Oct 14, 2023 5:18 am
It must have been one of these: https://www.youtube.com/watch?v=mdN8OOk ... 7BE871ABA3

Erland

I was thinking of the one with the tank with water moving across and various vanes were put in the water to show how converging and diverging flow works.

You could learn more with a rig with a clear cylinder, and a moving piston and water with neutral buoyancy fluorescent beads in it. That way you can learn about the trajectory of the suspended materials through the stroke and you can even simulate overlap. The piston doesn't need to move fast with ...

Air flowing into an open cylinder takes a very different trajectory that air following a piston. That maybe true, but you can have that debate with Darin Morgan. There is nothing to debate, it is an observed fact. The reasons for it are obvious, the curtain area of a valve is much less than the are...

Air flowing into an open cylinder takes a very different trajectory that air following a piston.