FRS / BRZ Intake Manifold - Development Thread - FT-86SpeedFactory by Velox

[Captain Snooze]

Originally Posted by lamawithonel

Those ridges look intentional. Do they serve a purpose?

Have you been reading this thread?

Originally Posted by gramicci101

Would it be beneficial for the inside of the horn to be polished smooth, or is it not a big deal? Or do the slight ridges perform some function that I am unaware of?

Originally Posted by NotEric6

It is not a big deal. That is just how this machinist decided to finish the bell horns. The ridges are very small and more aesthetic than actual ridges (probably 10 thou max between peak and valley).

Originally Posted by NotEric6

Like previously stated, between peak and valley their is only 10 thousandths of an inch difference. We are not concerned that the ridges reduce or add any performance. We will not be sanding them.

[FRS Justin]

Originally Posted by lamawithonel

Those ridges look intentional. Do they serve a purpose?

I would assume to direct airflow.

[Captain Snooze]

Originally Posted by FRS Justin

I would assume to direct airflow.

Are you trolling? From the very post above yours:

Originally Posted by NotEric6

It is not a big deal. That is just how this machinist decided to finish the bell horns. The ridges are very small and more aesthetic than actual ridges (probably 10 thou max between peak and valley).

Originally Posted by NotEric6

We are not concerned that the ridges reduce or add any performance.

[Captain Snooze]

Originally Posted by lamawithonel

Those ridges look intentional. Do they serve a purpose?

Originally Posted by FRS Justin

I would assume to direct airflow.

The bellhorns serve a different purpose from these:

[lamawithonel]

No, I haven't been following that closely.

But I was thinking more like this.

Shark-skin surfaces for fluid-drag reduction in turbulent flow
DOI: 10.1098/rsta.2010.0201


Of course, there are no scales here-- no trailing edges, so I'm not sure if it would work. @eric6 and @NotEric6, have you run any simulations?

[DocWalt]

Originally Posted by NotEric6

You intake temps probably sky rocketed at cruising/idle speeds but at WOT I would be willing to bet they were close to what they were before. I could be very wrong though. Properly designed plastic pieces are extremely expensive like you said. Most of that cost is in tooling though..

Bingo... Since I'm sure most of us drooling here drive our cars on the street too... We do need to take that into consideration

And yep, tooling costs are the issue. I think it's fairly easy to tweak your design for plastic upper plenum bits, but meh.

[Calum]

Originally Posted by NotEric6

You intake temps probably sky rocketed at cruising/idle speeds but at WOT I would be willing to bet they were close to what they were before. I could be very wrong though. Properly designed plastic pieces are extremely expensive like you said. Most of that cost is in tooling though.





These are headed my way to test. Using logs and virtual dyno I should be able to deduct which set is best for NA and go to the dyno with that set. Please be patient as we are all dying to know how it does as well .

I wasn't expecting such small differences in height. How much do you expect those to change the tuned rpm of the runners.

As its 4 in the morning and I don't feel like doing the math, I'm guessing about 100 rpm from one size to the next.

[Captain Snooze]

@NotEric6 @nelsmar
Will you be in a position to tell me/us if this manifold will be ok to run without a tune?
I appreciate it would not be optimal but for myself organising a tune takes time*.



*It gets fitted locally then book a tune 350 kms away, organise the wallet, organise time off from my work, the wife's work, stay 2 or 3 nights, yadda yadda.

[FRS Justin]

Originally Posted by Captain Snooze

Are you trolling? From the very post above yours:

No I would really assume they would direct air flow. Let me enlighten you a little on air flow.
1. Everyone knows that if you have a rough surface it will cause turbulence, swirling and a bunch of other problems I am not going into I suggest researching port and polishing to get a better idea
2 Cylinder ports and intake ports are reshaped to enhance flow for obvious reasons once again do some research.
3 If you have a surface that is too slick air will tumble and not follow the port design resulting in hp loss Trust me I found out the hard way. I had to remove the heads and rough up the port and presto 20hp SO before you jump to trolling ask a question I'm not perfect only human and due to make a mistake from time to time but never a troll
Good day sir

[Captain Snooze]

Originally Posted by FRS Justin

I'm not perfect only human and due to make a mistake from time to time but never a troll

No worries

[FRS Justin]

Originally Posted by Captain Snooze

No worries

Cool Brother

[raven1231]

Originally Posted by NotEric6

You intake temps probably sky rocketed at cruising/idle speeds but at WOT I would be willing to bet they were close to what they were before. I could be very wrong though. Properly designed plastic pieces are extremely expensive like you said. Most of that cost is in tooling though.





These are headed my way to test. Using logs and virtual dyno I should be able to deduct which set is best for NA and go to the dyno with that set. Please be patient as we are all dying to know how it does as well .

Members of this forum patient ? looking good though guys!

[themadscientist]

Boundary layer is good. A little rough flows better than mirror polished.

[churchx]

Laminar flow usually flows better & with less resistance, then turbulent one. Though i don't know if that's the case here, who knows, maybe more turbulent air in intake might somehow help fuel dissipation in air, or not that applicable here with on-off pulsating flow depending on cylinder cycles and cams open/closed. Only experiments may tell, but my bet that mirror finish might be slightly better .. but will that be enough for extra work/costs?