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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain.


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Old 08-04-2015, 01:21 AM   #15
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It's nice to see more development for manifolds. Fbm, velox and now this one.

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Old 08-04-2015, 07:51 AM   #16
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Quote:
Originally Posted by Captain Snooze View Post
Sorry, I don't know what it is that is being designed here.
Am I correct this is going to be a tuned length intake mimicking free to air trumpets?
That is, another interpretation of the Velox manifold?

*starts fantasizing about another 10 na hp*
From all the intake manifold designs I have seen thus far for this car, they all seem to share the same "stock" design in that the rear cylinders have runners that are in the rear of the manifold. As air enters the manifold the first 2 cylinders have first access to any incoming air, and the rear cylinders however small the difference may be, get what is left. This is a common design shared by most OEM's, but in my opinion it's not the most efficient.

This manifold is being designed in 4 pieces: The flanges (1), The injector ports (2), the Throttle body collector (3) and the tubing (4).

My goal is to create equal length runners for all 4 cylinders that all meet into a centralized collector where each runner has an equal opportunity to suck air at the same time and same location. Imagine an exhaust header where all 4 tubes come into a single collector, and that's what I'm going for except on the intake side.

My friend is going to be going slightly different route with his manifold and we're going to dyno the two of them to see who has the better design in the end, before we decide if it's feasible to mass produce or not. Not sure what the demand would be for a part such as this, which is why I start by designing it just for my own car.
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Old 08-04-2015, 07:59 PM   #17
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awesome project. thanks for sharing so far
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Old 08-04-2015, 09:16 PM   #18
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What you are describing is very similar to how the original 1ZZ intake was shaped


There are bunches of FSAE paper on that design. Bunches of them.
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Old 08-04-2015, 10:32 PM   #19
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What you are describing is very similar to how the original 1ZZ intake was shaped

There are bunches of FSAE paper on that design. Bunches of them.
Yes, very similar. Do you have any links to the papers? I'd love to learn whatever I can to make it better.
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Old 08-04-2015, 10:46 PM   #20
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I'll dig up the SAE numbers. Your lib may be able to get them. If not your local community college lib surely will. If not, call up the nearest uni with an engineering department and ask to get a hold of the FSAE team captain. Many of the ME students would jump at the opportunity to be involved and build out their portfolio.

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Old 08-05-2015, 04:11 AM   #21
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What about this?
http://www.ft86club.com/forums/showp...9&postcount=13
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Old 08-05-2015, 07:29 AM   #22
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Similar but not the same - still not an equal length system. Close.
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Old 08-05-2015, 07:42 AM   #23
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Similar but not the same - still not an equal length system. Close.
Sorry for the thread hijack but in the Velox intake I thought the trumpet heights were all the same which is where the intake length is measured from.
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Old 08-05-2015, 09:58 AM   #24
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Originally Posted by Captain Snooze View Post
Sorry for the thread hijack but in the Velox intake I thought the trumpet heights were all the same which is where the intake length is measured from.
That's correct. The long tubes visible in that picture are acting more as part of the plenum. The issues is that the plenum has to be sized to give good throttle responce while not restricting top end. As with everything I'm a car its a compromise.

And no, those tubes may not be equal lengths. But, I'm guessing Erik did the calculations to ensure the resonance frequency of the tube won't be a factor.
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Old 08-05-2015, 01:49 PM   #25
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I'm watching this thread with interest. Erik Already mentioned the Velox intake isn't working out for NA applications.

Seen projects like this before. I like where you're going.

The boxer configuration lends itself to long runners. Could be very interesting. By all accounts, these engines really want to breathe, they just can't seem to stack up the velocity for high VE when NA. The valves are already huge. That's definitely an issue that a new manifold with long runners can solve. The head ports are huge, which is going to encourage large diameter pipe.



Related: for your consideration

EDIT: You're going to have to coil up those EL tubes somehow. +1000 respect if you do a ram's horn.
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Old 08-05-2015, 04:30 PM   #26
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Has anyone tried to make an LSx/Coyote style intake manifold? Just a thought, notice most big V6/V8 engines the OEMs use this style of intake.

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Old 08-05-2015, 07:34 PM   #27
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I can't find my sources from when I was in FSAE, so I did a google image search for FSAE intake and grabbed a source from pictures which matched the collector design. I haven't done any vetting process, but you get the idea to be able to dig more yourself:
http://www.fsae.com/forums/showthrea...elling-in-WAVE
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Old 08-05-2015, 07:44 PM   #28
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I can't find my sources from when I was in FSAE, so I did a google image search for FSAE intake and grabbed a source from pictures which matched the collector design. I haven't done any vetting process, but you get the idea to be able to dig more yourself:
http://www.fsae.com/forums/showthrea...elling-in-WAVE
*reads link, mind expands, then explodes*
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