Don Terrill’s Speed-Talk

Carnut1 wrote:Resized_20170716_164354.jpegDV and I had a conversation on port textures the other day and I was doing some fooling around today. I came up with this texture on iron and I think I will do the intakes of my next iron heads like this. I would like some input. Fyi super easy. I blew up the pic to show texture. Bottom left of 289 intake bowl. Thanks,Charlie

I'm jealous. That looks pretty damn good.

Thanks Stats, I am interested in your opinion on what a texture does in a port?

Carnut1 wrote:Thanks Stats, I am interested in your opinion on what a texture does in a port?

I'm not sure I know, or even have a good guess. But, I do know when smart guys like Larry Meaux and Chad Spier are making power with it, and I have lost, I have to think I'm doing it wrong.


My best, piss poor guess is that rather than disturbing the boundary layer and disrupting flow, it makes the flow more laminar and keeps the air/fuel mixture more homogenous.


That's the best guess I have.

BOOT wrote:

BOOT wrote:Just occurred me to dimples/burr finish is about holding fuel or wetting the walls better for the cooling effect. Increased surface area w/o the downside of smooth wetting.

So we need a fuel resistant coating that has a semi course media(like a cart roll finish)to fight puddling.


If you have puddling in the intake port, find someone who knows what they are doing. Or turn the engine more than 10 rpm.

MTENGINES wrote:

BOOT wrote:

BOOT wrote:Just occurred me to dimples/burr finish is about holding fuel or wetting the walls better for the cooling effect. Increased surface area w/o the downside of smooth wetting.

So we need a fuel resistant coating that has a semi course media(like a cart roll finish)to fight puddling.


If you have puddling in the intake port, find someone who knows what they are doing. Or turn the engine more than 10 rpm.

Watch The Case finger video

statsystems wrote:

Carnut1 wrote:Thanks Stats, I am interested in your opinion on what a texture does in a port?

I'm not sure I know, or even have a good guess. But, I do know when smart guys like Larry Meaux and Chad Spier are making power with it, and I have lost, I have to think I'm doing it wrong.


My best, piss poor guess is that rather than disturbing the boundary layer and disrupting flow, it makes the flow more laminar and keeps the air/fuel mixture more homogenous.


That's the best guess I have.

Maybe this video will stir some thoughts?

https://www.youtube.com/watch?v=zl7jk85D2sE

The Radius Kid wrote:

statsystems wrote:

Carnut1 wrote:Thanks Stats, I am interested in your opinion on what a texture does in a port?

I'm not sure I know, or even have a good guess. But, I do know when smart guys like Larry Meaux and Chad Spier are making power with it, and I have lost, I have to think I'm doing it wrong.


My best, piss poor guess is that rather than disturbing the boundary layer and disrupting flow, it makes the flow more laminar and keeps the air/fuel mixture more homogenous.


That's the best guess I have.

Maybe this video will stir some thoughts?

https://www.youtube.com/watch?v=zl7jk85D2sE

Interesting. When the air comes apart like it did on top of the deck lid I know that's bad.

Was just contemplating the "golf ball dimple" business. It seems to me that a golf ball is traveling at a high velocity through dry air PLUS it is spinning at a high rate of speed. I wonder if the golf ball engineers ever compared the effect of dimples, no dimples in the rain? Probably not since not much golfing done while raining.And if the golf ball was a knuckle ball,no spin, how much improvement in distance and trajectory would they find. The whole wet flow-dry flow approaches intrigue me. I am in awe thinking about how much time and labor has been spent on finding the gains made in the texture experiment. You guys are good and people like me appreciate the sharing of ideas about all aspects of making horsepower. I just got caught up in this thread and have some ideas of my own you have inspired me to try.

statsystems wrote:

The Radius Kid wrote:

statsystems wrote:

I'm not sure I know, or even have a good guess. But, I do know when smart guys like Larry Meaux and Chad Spier are making power with it, and I have lost, I have to think I'm doing it wrong.


My best, piss poor guess is that rather than disturbing the boundary layer and disrupting flow, it makes the flow more laminar and keeps the air/fuel mixture more homogenous.


That's the best guess I have.

Maybe this video will stir some thoughts?

https://www.youtube.com/watch?v=zl7jk85D2sE

Interesting. When the air comes apart like it did on top of the deck lid I know that's bad.

What did you notice around the 2:30 mark?

I see what you've got going on there, Charlie, and me likes. Really impressive work!

If you follow that same idea into the chamber, does it have any affect on reverse flow at low lift?

RevTheory wrote:I see what you've got going on there, Charlie, and me likes. Really impressive work!

If you follow that same idea into the chamber, does it have any affect on reverse flow at low lift?

Good question Rev. I don't know.

Experiment: bone stock '65 289 heads flow them. Install heavy burr finish removing least amount of material and leaving razor sharp stock edges, reflow.

Carnut1 wrote:Resized_20170716_164354.jpegDV and I had a conversation on port textures the other day and I was doing some fooling around today. I came up with this texture on iron and I think I will do the intakes of my next iron heads like this. I would like some input. Fyi super easy. I blew up the pic to show texture. Bottom left of 289 intake bowl. Thanks,Charlie

What did you use to achieve the texture?

Super secret!

Carnut1 wrote:Super secret!

curious to se the difference after your hamster gnawed on it for a while .