Pics Inside the 2017 Red Manifold?

[nico_rsx]

Originally Posted by SCQTT

My understanding is this.

A rough, sandblasted surface, leaves tiny little holes for air to reside. Air slides better on air than a shiny smooth surface.

I know it sounds crazy but on a large scale think of a truck bed. Tailgate down air is flowing over the cab and into the bed. The now horizontal tailgate is now NOT acting as a parachute. Efficient right? Actually no. The tailgate up traps a rolling air bubble in the bed. air coming over the cab simply bounces of this rolling air mass. Makes sense even it is seems less than logical -at first.


IIRC people would match the ports, get rid of casting marks and make the surface as straight and smooth as possible....then rough it up with a sandblaster.

I've also heard that. Polishing an intake doesn't improve flow and in theory could deteriorate it. Having a super smooth finish can increase air turbulence.

[NoHaveMSG]

Originally Posted by nico_rsx

I've also heard that. Polishing an intake doesn't improve flow and in theory could deteriorate it. Having a super smooth finish can increase air turbulence.

Look up "boundary layer effect." A perfectly smooth surface can still produce a significant amount.

I am not an expert on the subject, but a lot of people misunderstand what it means to texture a port. General rule of thumb I was always taught was "smooth to the eye, but not to the touch."

[humfrz]

Originally Posted by SCQTT

My understanding is this.

A rough, sandblasted surface, leaves tiny little holes for air to reside. Air slides better on air than a shiny smooth surface.

I know it sounds crazy but on a large scale think of a truck bed. Tailgate down air is flowing over the cab and into the bed. The now horizontal tailgate is now NOT acting as a parachute. Efficient right? Actually no. The tailgate up traps a rolling air bubble in the bed. air coming over the cab simply bounces of this rolling air mass. Makes sense even it is seems less than logical -at first.


IIRC people would match the ports, get rid of casting marks and make the surface as straight and smooth as possible....then rough it up with a sandblaster.

hmmmm........maybe you would like to do the math ........ I would, but it's time for my nap ........

https://en.wikipedia.org/wiki/Moody_chart


humfrz

[Hawk77FT]

Originally Posted by humfrz

hmmmm........maybe you would like to do the math ........ I would, but it's time for my nap ........

https://en.wikipedia.org/wiki/Moody_chart


humfrz

Looks to me that the lower the roughness the lower is the friction factor. That makes me wonder if less friction = higher velocity?

I am having my 2017 intake manifold Extrude honed pretty soon! Will show results.

[Lantanafrs2]

The fuel and air meet near intake ports so atomization shouldn't be an issue. I doubt there are any measurable gains to be had by reworking surface finish in manifold though. I'd like to be wrong on this one.

[gtengr]

Originally Posted by SCQTT

My understanding is this.

A rough, sandblasted surface, leaves tiny little holes for air to reside. Air slides better on air than a shiny smooth surface.

I know it sounds crazy but on a large scale think of a truck bed. Tailgate down air is flowing over the cab and into the bed. The now horizontal tailgate is now NOT acting as a parachute. Efficient right? Actually no. The tailgate up traps a rolling air bubble in the bed. air coming over the cab simply bounces of this rolling air mass. Makes sense even it is seems less than logical -at first.

Maintaining that circulation of air in the truck bed requires energy. It's better to have solid bodywork for the air to flow over than for it to change directions and swirl around. Unless a turbulent boundary layer is needed for something very specific like aiding in fuel atomization, smoother is better.

[Hawk77FT]

I have just received my 2017 intake manifold extrude honed










The surface is much smoother. They mentioned that the intake manifold flows really good as it is. As good as Porsche 911 and some in terms of the CFM per runner.
Runner before after
1. 431 472
2. 433 474
3. 430 471
4. 427 468

Will post results

[SuperTom]

damn that looks awesome!

[Williampreza]

Originally Posted by Hawk77FT

I have just received my 2017 intake manifold extrude honed



...



The surface is much smoother. They mentioned that the intake manifold flows really good as it is. As good as Porsche 911 and some in terms of the CFM per runner.

Runner before after

1. 431 472

2. 433 474

3. 430 471

4. 427 468



Will post results

Can’t wait to see if this makes a difference!


Sent from my iPhone using Tapatalk

[firekat]

An average increase in CFM of 8.6%

Should be interesting to see how this works out. How much did the process cost?

[valtore101]

Originally Posted by firekat

An average increase in CFM of 8.6%

Should be interesting to see how this works out. How much did the process cost?

Curious to see how this compares to the FBM intake manifold.

[Hawk77FT]

Originally Posted by firekat

An average increase in CFM of 8.6%

Should be interesting to see how this works out. How much did the process cost?

Yeah, I am excited. I am seeing the ceramic coat people this morning and see what they can do. It cost me about 600 aud.

[Hawk77FT]

Originally Posted by valtore101

Curious to see how this compares to the FBM intake manifold.

The only issue though, is that there is no NA results for the fbm manifold.
I think in terms of intake, I have done everything possible to improve. I have the Grimmspeed intake but will change to something similar to revolution garage.

[valtore101]

Originally Posted by Hawk77FT

The only issue though, is that there is no NA results for the fbm manifold.
I think in terms of intake, I have done everything possible to improve. I have the Grimmspeed intake but will change to something similar to revolution garage.

I was more commenting for FI.