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Old 12-20-2012, 05:54 PM   #561
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Quote:
Originally Posted by BogusSVO View Post

Unless the intake engeneers for Edelbrock all these years have been wrong....
Short runner B18 Edelbrock manifold, for 7000-10000rpm:
Edelbrock Victor X Intake Manifolds - SummitRacing.com

Long runner B18 Edelbrock manifold, for 3000-7800rpm:
Edelbrock Performer X Intake Manifolds 4771 - SummitRacing.com
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Old 12-20-2012, 05:57 PM   #562
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Hmm a design i'm thinking off is an extremely short runner that gets rid of the pulses completely, more so like a plenum bolted directly to the head? Something like this?

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Old 12-20-2012, 06:31 PM   #563
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I have never, EVER, seen any information showing long runners = top end power.
In fact, everything I have ever seen about intake manifolds, supports the short = topend, and long = lowend general rule of thumb we have here.

Sorry BogusSVO

Last edited by 18psi; 12-20-2012 at 06:58 PM.
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Old 12-20-2012, 06:56 PM   #564
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Hmm a design i'm thinking off is an extremely short runner that gets rid of the pulses completely
You say this like the pulses are a bad thing...
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Old 12-20-2012, 06:57 PM   #565
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20K RPM motor IM build. I want to see this.
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Old 12-20-2012, 07:08 PM   #566
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Quote:
Originally Posted by Savington View Post
You say this like the pulses are a bad thing...
Correct because they are pulses that go back into the air going towards the runners.
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Old 12-20-2012, 07:13 PM   #567
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Originally Posted by triple88a View Post
Correct because they are pulses that go back into the air going towards the runners.
I'll give you a hint: Pulses aren't a bad thing.
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Old 12-20-2012, 07:17 PM   #568
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lol he hates torque
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Old 12-20-2012, 09:08 PM   #569
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Correct me if Im wrong:
The pulses are reflections OFF THE INSIDE OF THE PLENUM, not the runners themselves. So you will have tiny little reflections, so you will get the benefit of those reflections no where in your rpm range. I dont know if pulses are a disadvantage at any point, I dont recall reading that anywhere.

Has anyone done any research into how the resonance frequencies of the intake manifold effect the flow? Its probably minor compared to things like volume, length, etc.
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Old 12-20-2012, 09:15 PM   #570
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Lol the resonance frequencies is the most important part of designing a manifold. They greatly increase the amount of air entering the cylinders at the rpms where the high pressure wave is at the valve while the valve is open.
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Old 12-20-2012, 09:47 PM   #571
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Quote:
Originally Posted by Vilko View Post
Has anyone done any research into how the resonance frequencies of the intake manifold effect the flow? Its probably minor compared to things like volume, length, etc.
Things like volume, length, cross section dictate resonant frequencies.
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Old 12-20-2012, 10:16 PM   #572
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Its been a while since we talked about this but whatever happened with begis manifolds? Werent they designing some stuff? I wanted to see how the top tb mount manifold will perform
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Old 01-21-2013, 11:16 AM   #573
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Sorry for resurrecting this thread but did anyone actually dyno this setup? After the 5th page I just started scrolling looking for results.
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Old 01-21-2013, 11:50 AM   #574
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see post 546
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Old 01-22-2013, 01:53 AM   #575
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Quote:
Originally Posted by emilio700 View Post
Things like volume, length, cross section dictate resonant frequencies.
I mean resonance as in the note it would produce if you were to play it like a triangle. Not to be confused with the sound/pressure waves that reflect off the plenum and influence the power band.
All the things you listed would affect resonance frequency, but so would the material its made from and a whole lot of other factors. Its probably not a big enough influence on power to justify the effort.
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Old 01-22-2013, 08:12 PM   #576
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I cant believe this thread is still going.
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Old 01-23-2013, 09:37 AM   #577
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Might as well just sticky the thread. Lots of good info in here.
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Old 01-25-2013, 05:02 PM   #578
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Does that set of dyno sheets reflect begi's NEW manifold that will probably never happen?

Last I heard that thing was supposed to be getting tested LAST SPRING. Nothing on there website even mentions it anymore. I'd love to get a manifold, especially one that is proven (see post 546). If I can find one I'll do a back to back stock 99 intake vs new and add more data.
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Old 01-28-2013, 02:50 PM   #579
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Just for data's sake..
This was the baseline before touching up the tune and revving higher. Sounds like most guys will stay at or near factory limit.
Refreshed N/A 94 block, stock 99 head. Solid line is 99 mani without vics wired, dotted is Blox skunk2 copy manifold.


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Old 01-31-2013, 01:28 PM   #580
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Quote:
Originally Posted by Braineack View Post


this compares pauls to a 97 block with 99 head and the same components.
I don't get this graph. Is one just tuned worse than the other? if they have the same components....
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