05-23-2015, 11:52 AM | #463 |
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Is intake manifold same height as OEM?
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05-23-2015, 05:27 PM | #465 |
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Can you say at this point in time if the Velox manifold will be higher than the top of the strut/suspension towers?
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05-23-2015, 05:51 PM | #466 | |
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05-23-2015, 07:15 PM | #467 |
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^lol
But there is an element if truth to that.
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05-23-2015, 11:44 PM | #468 |
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05-26-2015, 12:01 PM | #469 |
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Well, we had some success over the long weekend.
[ame="https://www.youtube.com/watch?v=tX0klBRychY"]FA20 Billet Intake Manifold - YouTube[/ame] With the help of @Nelsmar we are dialing in cam timing for the manifold currently. Dyno should be within the next few weeks although we believe we are running the incorrect bellhorn height for an NA application. Even still, Ecutek logs are showing some potential that makes us excited . |
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05-26-2015, 12:09 PM | #470 | |
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05-26-2015, 06:11 PM | #472 |
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@NotEric6
Can you explain in non technical terms why you suspect the bellhorns are the wrong height for na applications? Ta.
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Last edited by Captain Snooze; 05-26-2015 at 09:53 PM. Reason: typo |
05-26-2015, 06:30 PM | #473 | |
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There is a lot involved with this topic... But the logs we were seeing were showing a fairly flat engine load at basically every RPM vs the stock manifold having a peak power. If you extend a runner typically you increase peak at a point and then add a curve to the power band. Just like what happens with the crawford manifold spacers. By extending the runner length it pushes the efficiency of the stock manifold to a lower RPM but costs power at the top end. And as the logs were showing some "interesting" bits at even 8,000RPM extending the runners could cause a similar effect to that of the crawford spacers by giving a "peak" at a lower RPM. So if we increased the runner length and the falloff landed at say 7800RPM then you may see more gains throughout the rest of the power band. This is why this manifold was made with multiple runners for testing. To see which ones would work best using the most efficiency design on every other aspect of the manifold that they could come up with. And then dial in adjustable parameters in the real world to see what actually improved the performance. Here is an example plot that shows what happens when someone was testing runner length on I want to say a rotary platform (I don't even remember what it is from): This is why the Yamaha R1 had a variable length runner at one point so that way it would move the runner to match the RPM and attempt to keep a more neutral power band, while still achieving the gains of a long runner at low RPM.
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05-26-2015, 06:53 PM | #474 | ||
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I'm very interested in the flow dynamics of the different bellhorn lengths and their resultant power band effects. This whole thing doesn't quite correlate to a standard intake manifold design, nor an ITB setup - since all of this is post TB, yet we have these individual plenums and then individual velocity stacks as well. This is by far one of the most interesting IM designs I've ever seen. It's like an inverted 1-2-4 header design It will be interesting to see how this works with aftermarket UEL vs EL header designs. Since one flows better in the midrange and the other up top. Running complementing vs contrasting parts combos could yield very interesting results. I'm hoping that you guys can incorporate some of these factors into your dyno testing. |
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05-26-2015, 08:24 PM | #475 |
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Thanks Nelsmar for your detailed reply.
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05-26-2015, 08:32 PM | #476 | |
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As for it being different than ITB's to the engine it is all the same... vacuum is vacuum. If the manifold is 2BAR or 1BAR (Atmospheric) the engine is still in a vacuum in comparison. The only difference is you are WOT with a bellhorn in the manifold and then you are simply regulating the pressure vs regulating the flow. The throttle can restrict flow vs having a massive plenum. However there are size constraints due to factory AC lines and other bits and pieces to be able to make a fully unrestricted manifold. Velox is simply putting the runner inside the plenum instead of adding the plenum on top of the runner... Think of the BMW manifolds... they are ITB's with stacks inside of a plenum. Im no specialists in this art / science but I have been around the scene for a while and I have seen many intake manifolds with this design in the Honda community in the past for the B & K series. Others have done this such as AMS, Full Blown, Skunk2... and many many others! http://www.streettunedmotorsports.co...e_manifold.htm http://velocityelement.com/the-veloc...ing-car-parts/
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