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

[HUNTERANGEL121]

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?

As far as I'm aware. The ridges are from the manufacturing of the horns. Polishing it would mean less resistance and turbulence I guess.

Sent from my toaster

[fika84]

@NotEric6.. is this thing installed on your car yet or what??? This suspense is killing me!

[cdrazic93]

Make the manifold slighty higher and add a throttle body to each veolcity stack so you can have debris-less ITB's ;D

[burdickjp]

Originally Posted by HUNTERANGEL121

As far as I'm aware. The ridges are from the manufacturing of the horns. Polishing it would mean less resistance and turbulence I guess.

If that is the case then their CNC programmer has gotten so bored he's doing some very strange things with tool paths.

[RJasonKlein]

Originally Posted by NotEric6

The car has a mid-pipe back aluminum exhaust that likely does nothing for power, I just wanted some noise.

I don't want to hijack your thread, but your aluminum exhaust has piqued my curiosity - can you tell us a little about it and post some pictures? If not here, then maybe on another thread?

[VerusEric]

Originally Posted by fika84

@NotEric6.. is this thing installed on your car yet or what??? This suspense is killing me!

I'm hoping this weekend .

Originally Posted by cdrazic93

Make the manifold slighty higher and add a throttle body to each veolcity stack so you can have debris-less ITB's ;D

Space is an issue.

Originally Posted by bur****jp

If that is the case then their CNC programmer has gotten so bored he's doing some very strange things with tool paths.

It was milled, not turned. So realistically the cut time was the same regardless. If we take this exact design to production (which is very much unsure right now), it will be a turned part.

Originally Posted by RJasonKlein

I don't want to hijack your thread, but your aluminum exhaust has piqued my curiosity - can you tell us a little about it and post some pictures? If not here, then maybe on another thread?

PM'd

[2much]

what aluminum exhaust??

[burdickjp]

Originally Posted by NotEric6

It was milled, not turned. So realistically the cut time was the same regardless. If we take this exact design to production (which is very much unsure right now), it will be a turned part.

It'd be impossible to do that on a lathe which doesn't have live tooling!
Of course it's milled. It's still a funky toolpath. Maybe they had difficulty getting a conventional path to work and this was the best way they could minimize tooling marks? I'd argue that's what post processing is for. Of course customers would rather see a sexy milled part than something which has been finished by sanding. I'm more of a form follows function kinda guy.
Are you going to finish these prototypes out to a smooth interior surface?

[cdrazic93]

Originally Posted by NotEric6

Space is an issue.

[Calum]

Originally Posted by bur****jp

It'd be impossible to do that on a lathe which doesn't have live tooling!
Of course it's milled. It's still a funky toolpath. Maybe they had difficulty getting a conventional path to work and this was the best way they could minimize tooling marks? I'd argue that's what post processing is for. Of course customers would rather see a sexy milled part than something which has been finished by sanding. I'm more of a form follows function kinda guy.
Are you going to finish these prototypes out to a smooth interior surface?

Why would it be impossible to turn a bell mouth on a lathe?

[phobos512]

Originally Posted by 2much

what aluminum exhaust??

obsoive

http://www.ft86club.com/forums/showp...&postcount=129

Originally Posted by NotEric6

I'm hoping this weekend .

Awesome! Can't wait to see what this does for NA.

[Hyper4mance2k]

Originally Posted by Calum

Why would it be impossible to turn a bell mouth on a lathe?

The right way to make a velocity stack.
[ame="https://www.youtube.com/watch?v=cgnB4bmodv4"]how to make a velocity stack - YouTube[/ame]

[VerusEric]

Originally Posted by bur****jp

It'd be impossible to do that on a lathe which doesn't have live tooling!
Of course it's milled. It's still a funky toolpath. Maybe they had difficulty getting a conventional path to work and this was the best way they could minimize tooling marks? I'd argue that's what post processing is for. Of course customers would rather see a sexy milled part than something which has been finished by sanding. I'm more of a form follows function kinda guy.
Are you going to finish these prototypes out to a smooth interior surface?

This can be made without live tooling on a lathe, and was actually designed to be made as a turned piece. To do it in one operation, yes you would need live tooling.

The function of these bellhorns are being blown way out of proportion. 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.

Originally Posted by Calum

Why would it be impossible to turn a bell mouth on a lathe?

It isn't, these are easily made on the lathe .

Originally Posted by phobos512

obsoive
http://www.ft86club.com/forums/showp...&postcount=129

This is my own custom aluminum exhaust, neat to see someone offering an off the shelf piece.

Originally Posted by Hyper4mance2k

The right way to make a velocity stack.

There are multiple ways to make a velocity stack or bell horn. As you can see in that video (this is called metal spinning I believe, and is a forming technique), the accuracy and repeat-ability is up to the operator. To us, this is too large a discrepancy from article to article, so we went with a CNC machined piece. Each route has its benefits and draw backs like so many things in life, but there is no right or wrong way.

[burdickjp]

Originally Posted by Calum

Why would it be impossible to turn a bell mouth on a lathe?

That's not what I said. I said it is obvious they are milled because the ridges would be impossible without live tooling. Turning bellmouths on a lathe is cakewalk. If you're clever and have some time you can even do it on a manual lathe.