[sdbob]

Remember few yrs ago we talked about that. You showed me some samples from someone did. I thought afterwards if it worked why hasn't it been used before?

[455firebird1969]

Good stuff Don. Similar YouTube videos (ancient) were used by my aerodynamics instructor. I seem to recall the golf ball in flight is experiencing "Magnus lift" a lifting force experienced by rotating bodies, and the dimples reducing drag. I wonder if race car wings will ever incorporate "Winglets" to reduce induced drag?

[dci]

Originally Posted by sdbob

Remember few yrs ago we talked about that. You showed me some samples from someone did. I thought afterwards if it worked why hasn't it been used before?

I get asked that allot LOL. I think because there is not a lot of guy's doing it yet or have experimented with it yet you just don't hear about it. Aeronautics, NASA, Formula 1, and other industries are using this technology. It just has not trickled down to us neophytes in the hot rod world yet.

[J.C.you]

Be nice if you could dimple the pushrod split and see if it makes a difference on the bench.

[Half-Inch Stud]

Wishing the Pushrod "tube" was a wing Trailing edge for air coming and going.

[dci]

Originally Posted by Half-Inch Stud

Wishing the Pushrod "tube" was a wing Trailing edge for air coming and going.

That can be done. There is plenty of material to shape it any way you like. What we have found it likes on the flow bench. Is a shape close to an airplane wing. Kind of like a tear drop, but with more of a pointed leading edge. The more I play with the shape the more I learn. You can definitely hear it on the bench when it doesn't like the shape though. I think this is going to be a neet tuning tool once we get a handle on what engine likes.

[johnta1]

Try a texture like shark skin on the tube.

[dci]

Originally Posted by johnta1

Try a texture like shark skin on the tube.

LOL, I already do that !!!!

John I used your calculator for port csa for a set of my RA5 heads I'm porting for a guy and after doing the port it looks really big. It's a 541, 4.375" bore, 4.5" stroke, 8500 rpm deal. I came up with a 4.5" csa at the push rod tube tapering down to the bowl 3.31" 92 percent of the valve. The opening at the tube is 2.50" x .980" on both sides of the tube minus the radius in the corners. I haven't flowed the head yet, but I'm a little concerned. I guess I'm just used to looking at E-heads and this looks big. I suppose because it is basically 2 E- head ports in one RA5 intake port LOL. I have to admit though I thought my RA5 intake port opening in the plenum was to big (2.650"), but that's definitely not the case. At least not on my 455 I built. That thing rips through the r's. What's your thoughts?