Cylinder head flow - What is crucial in a stocker?

[Larry Hill]

You want to manage the air on the outside of the car as well. Case in point on the truck the bed was off to one side. We centered the bed behind the cab and it picked up a little in et and MPH. An easy way to cheat is to cheat the wind.

[Stan Weiss]

Originally Posted by Larry Hill

You want to manage the air on the outside of the car as well. Case in point on the truck the bed was off to one side. We centered the bed behind the cab and it picked up a little in et and MPH. An easy way to cheat is to cheat the wind.

Yes anything you can do to reduce Frontal Area or Coefficient of Drag (CD) will show up in reduced et and increased MPH.

Stan

[Paul Precht]

I have Chrysler's old formulas and graphs and I made my own with the info that I had back in the early 90s when I had my first machine shop. I'll scan them if I can find them but I seem to remember at 3,300 lbs a 12.20 et is about 10 hp per tenth, a 9.80 at the same weight is almost 17 hp per tenth. I broke it down from 9.50 to 16.0 and different weights can be used, a heavier car at the same et will require more hp per tenth.

[SSDiv6]

In the 1980's when I was involved with IMSA and SCCA road racing with the Mazda Factory Team, we were applying an industrial spray-on wax to the car paint finish that was manufactured by either Dow or DuPont, called Microfill. The intent of the wax was to fill the microporosity of the paint, enhancing the airflow over the body surface of the car. As I was told at the time, Mazda had discovered some aero improvement in the wind tunnel by applying the wax. At the time, the cars were being painted with DuPont Imron Epoxy Paint.

Nowadays, there are many products that contain nanoparticles with a ceramic compound that may do the same.

[Mark Yacavone]

So, lacquer primer...not so good, huh? :-(

( I was going to comment on the subject of this thread, but I don't want to stink it up, so I'll start a new one..Meanwhile, I've got to go and buff out my car for next weekend;-) )

[Stan Weiss]

Remember aerodynamic drag HP loss is not linear. This graph shows what a change from 0.35 to 0.34 for CD does.

Stan

[SSDiv6]

Originally Posted by Mark Yacavone

So, lacquer primer...not so good, huh? :-(

( I was going to comment on the subject of this thread, but I don't want to stink it up, so I'll start a new one..Meanwhile, I've got to go and buff out my car for next weekend;-) )

LOL!

On a small Cessna airplane, waxing the exterior increased the airspeed by 3.5 MPH

[Charles Stewart]

Dear SSDiv6,
I will throw this add up to your paint preparation subject and just for discussion or the fun of it (with no disregard to your point) an even if this isn’t in direct relation with the title subject.
I was at the Napierville Nationals Open Series few years ago and I was taking a close look at the NHRA “open tech barn” at the back of the tower. A certain stocker had his engine check for the approval of new E.T. record, for the second year in a row.
While waiting and checking the Tech’s work, the car parts, suddenly a small detail pop-up… The golf ball effect…The car had a good or important orange peel surface…

[L.Fite]

Originally Posted by Charles Stewart

Dear SSDiv6,
I will throw this add up to your paint preparation subject and just for discussion or the fun of it (with no disregard to your point) an even if this isn’t in direct relation with the title subject.
I was at the Napierville Nationals Open Series few years ago and I was taking a close look at the NHRA “open tech barn” at the back of the tower. A certain stocker had is engine check for the approval of new E.T. record, for the second year in a row.
While waiting and checking the Tech’s work, the car parts, suddenly a small detail pop-up… The golf ball effect…The car had a good or important orange peel surface…

I was once told by a racer that after he had a vinyl top put on his car he picked up MPH...?...
Fact?... or fiction?...

[Bill Diehl]

Originally Posted by Charles Stewart

Dear SSDiv6,
I will throw this add up to your paint preparation subject and just for discussion or the fun of it (with no disregard to your point) an even if this isn’t in direct relation with the title subject.
I was at the Napierville Nationals Open Series few years ago and I was taking a close look at the NHRA “open tech barn” at the back of the tower. A certain stocker had is engine check for the approval of new E.T. record, for the second year in a row.
While waiting and checking the Tech’s work, the car parts, suddenly a small detail pop-up… The golf ball effect…The car had a good or important orange peel surface…

Air is different than water, or is it? anybody that messed with overpowered outboard boats knows that primer is faster than smooth and shiny on the pad and the lower unit, 4,5 or 6 mph and how you go from stuck in the upper 90's to breaking triple digits......that "theory" that has been proven also applies to cylinder head ports...but what do I know? the "experts say, size matters more", not flow