Most liked posts in thread: Manifold Madness

The polished manifold will look nice [reminds me of when I smoothed out the intake manifold on my turbo-build, but powder coated it gloss black instead], but what's the rationale for going with the return-line fuel rail?

 

Looking good Lynn! How's the flow accross the board now?

Jeremy

 

Don't you need some roughness on the interior or the polishing will allow a boundary layer to be created at the surface walls. This causes uneven tension on the air column as it moves through the intake path, which can lead to shearing of the air flow which will reduce the air flow quality and quantity.

To explain the boundary effect a little better...

Envision the gas flowing in a conduit and the molecules in direct contact with the conduit wall are by definition not moving. The next molecule out is moving a little but due to friction with the stationary one, it is not as fast as the next molecule out. Speed of the molecules increases as they are spaced away from the wall. This virtually no-flow region is termed the boundary layer and the thicker this is, the worse it is for an intake manifold. Continue looking at the molecules as you go to the center of the flowing stream and you will find they get faster and faster until the very center ones are fastest of all.

 

Looks good. I admire your work. I offer these already done on an exchange basis so I know you put alot of work in. I hope to have our pics up soon, but I'm no good with photos.
Way Motor Works :: Performance :: Intakes :: Ported and polished Intake Manifold set R53

 

Nathan,

[ame="http://en.wikipedia.org/wiki/Boundary_layer"]Here[/ame] is a discussion of boundary layer.

And [ame="http://en.wikipedia.org/wiki/Reynolds_number"]here[/ame] is a disappointing article on Reynold's number.

Only one cylinder at a time is pulling air, and it's intake valve(s) are much smaller than the diameter of the rest of the system. My overeducated guess is that the intake horns, hoses, etc.. are designed to make sure that a low Reynold's number is obtained, but also designed to minimize raw material. If someone is ambitious enough to polish the cast pieces, it won't hurt and might just help flow some.

 

WOW I have to say I'm impressed you polished the outside too. That was a ton of work.

 

I don't want to derail this thread much further but could you or someone else post a how-to on polishing the SC horns to achieve that show-car finish on the outside? I'm assuming a similar system could be used on the inside for some performance gains but my engine's not at that level yet.

 

there's a big diff between Turbo and NOS. I'm not saying it cant be done... I would love to see someone else get close to the power we made.

Good luck! I look forward to seeing the results

Also, it's Hubie/MEGAmini/Mynes/Brain/myself... etc Fireball was just a clown stealing hard work and money from people. Let's not give anymore credit to those that dont deserve it