Intake Manifold Porting Show ‘n Tell

[Joe-71]

How about some diversity. Here are a couple. Joe-71

[juuhanaa]

The reputation of village madman is easy to get, but hard to maintain.

If we only had enough manifolds to cut in half



-juhana

[SpeierRacingHeads]

Chad
I have one on shelf that I hang on to test with.Is the efi Vic e same intake with efi bosses?I have never saw one.

Yes, same manifold just with bosses.

[EDC]

Odd stuff?

Canfield EFI Manifold


Offy Dial-A-Flow Manifold

[Joe-71]

More diversity. Cutting the Plenum and porting it and welding it back together adds 18 lb/ft, 18 hp. Been at that since 1987 for hundreds of folks during the 5.0 HO time period. Joe-71

[ChopperScott]

Work in progress...

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[RevTheory]

Does anyone have any experience with the Weiand Track Warrior for a BBC in a 496? I'm sure curious about the pro and cons. Some of the negative reviews I've seen were about the runners being too small and that's about perfect for what I have in mind which is a high-torque, 6k rpm peak hp application with a Terminator X Stealth. I just don't know anything about it.

[ChopperScott]

Does anyone have any experience with the Weiand Track Warrior for a BBC in a 496? I'm sure curious about the pro and cons. Some of the negative reviews I've seen were about the runners being too small and that's about perfect for what I have in mind which is a high-torque, 6k rpm peak hp application with a Terminator X Stealth. I just don't know anything about it.

I don't have any experience, but that looks like a nice manifold as cast. I'm sure it would clean it up well.

[SpeierRacingHeads]

[ChopperScott]

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[ChopperScott]

This Team G was the manifold with the poor gasket matching. I'd much rather work with an untouched port...

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[steve cowan]

Here is a pic of imo the most common mistake made.And getting paid for the hours to correct this is tough.Guy paid for this once and now I get to redo it correctly Look at fair left runner which is number 3.Its a shorter runner than number 1 next to it.It has a bunch more csa than number 1 runner.So I can only go up on number 1 to get csa and taper fixed.It won't have much of a round radius left going into the roof.I will have to add 1 inch spacer and incorporate into that.This will get plenum opened a bunch with shear plate also.IMG_20221127_120751130.jpg

Lloyd,
Really appreciate your input and photos etc,you do really nice work.
I have a question for you or anyone else who wants to answer -
My engines are 550 - 600hp 383 sbc stuff I run
Street/ strip car 3600 pounds.
I have done a few single plane intakes
Vic Jr
300 - 25
SV
and I have several others.
When I size a intake and decide on what I think is close I make the CSA of both runners the same only length is the governing factor.
I always open carb pad and have lots of spacers.
The question regards keeping the intake manifold runners the same size.??
I currently run at 6000 - 7500rpm window but one combo will go 8000rpm next year hopefully using the big trickflow intake manifold.
Thanks in advance
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My long runners are always bigger and more taper up in plenum to flange.I look at and work on 1 in SBC and decide from it how to size others.Say if number 1 ends up 4.5" at plenum then number 2 and 7 will be a little less and my shorts would be like 3.95"-4.05" just as examples.
Hope that is understandable?in sheet metal spread port runner if all ports same length they get same size csa and taper.

Yes,
I understand what you are saying, thank you.
Great information.

[steve cowan]

Now like in pic of comp short runner deal.im just showing that.Its not anything you want to copy for 7000 rpm engine.I will throw out a general consensus that I see in allot of stuff is around 7deg taper.So if you look at your runner length and do some simple math you can see what different sizes needed for more length or shorter.This is not a perfect scenario but could give guys a step up in their program.Another thing I see allot that imo is wrong is getting top of runner in plenum than at floor.Floor in intake needs thought and plenty of attention.That is where largest chaos point occurs imo.

From seeing Jon Kasse dyno video with a clear / perspex section of intake manifold, it seems raised floor in plenum might benefit, when on flowbench with pitot the air gets pulled around radius/ roof area but in a running engine with fuel drop out and wall wetting the scenario is very different.
Imagine what is happening with pressure pulses in play as well.

[Lloyd klem]

Here is a pic of imo the most common mistake made.And getting paid for the hours to correct this is tough.Guy paid for this once and now I get to redo it correctly Look at fair left runner which is number 3.Its a shorter runner than number 1 next to it.It has a bunch more csa than number 1 runner.So I can only go up on number 1 to get csa and taper fixed.It won't have much of a round radius left going into the roof.I will have to add 1 inch spacer and incorporate into that.This will get plenum opened a bunch with shear plate also.IMG_20221127_120751130.jpg

Lloyd,
Really appreciate your input and photos etc,you do really nice work.
I have a question for you or anyone else who wants to answer -
My engines are 550 - 600hp 383 sbc stuff I run
Street/ strip car 3600 pounds.
I have done a few single plane intakes
Vic Jr
300 - 25
SV
and I have several others.
When I size a intake and decide on what I think is close I make the CSA of both runners the same only length is the governing factor.
I always open carb pad and have lots of spacers.
The question regards keeping the intake manifold runners the same size.??
I currently run at 6000 - 7500rpm window but one combo will go 8000rpm next year hopefully using the big trickflow intake manifold.
Thanks in advance
20220224_162126.jpg20220224_162138.jpg

I will give you my opinion on where I would be if trying to peak say 7500 and run out to 8000ish.If mine I would have intake valve about 52 percent of bore being used.I would leave my throat 91 to 91.5 of that valve.I measure my runner length from valve seat to say about 3/8" back from radius in plenum opening.So imo for that rpm I would be wanting right at 11" total runner tract.So if head port average is 5.5" then that leave same 5.5" avr of runners in intake manifold.This is my opinion and just something to think about and look at.If you had say 2.55" csa at upper runner area in head I would be looking at about 3.6" on my long runner in plenum for csa and 3.25ish on my short center runners.This can be changed with other variables as cam events etc used .Again this is just where I would be and roughly what I have used in that similar area.I like 2" 4 hole radius into open spacer for general tuning.I like to have carb blades away from floor of manifold etc.

[SpeierRacingHeads]

Here is a pic of imo the most common mistake made.And getting paid for the hours to correct this is tough.Guy paid for this once and now I get to redo it correctly Look at fair left runner which is number 3.Its a shorter runner than number 1 next to it.It has a bunch more csa than number 1 runner.So I can only go up on number 1 to get csa and taper fixed.It won't have much of a round radius left going into the roof.I will have to add 1 inch spacer and incorporate into that.This will get plenum opened a bunch with shear plate also.IMG_20221127_120751130.jpg

Lloyd,
Really appreciate your input and photos etc,you do really nice work.
I have a question for you or anyone else who wants to answer -
My engines are 550 - 600hp 383 sbc stuff I run
Street/ strip car 3600 pounds.
I have done a few single plane intakes
Vic Jr
300 - 25
SV
and I have several others.
When I size a intake and decide on what I think is close I make the CSA of both runners the same only length is the governing factor.
I always open carb pad and have lots of spacers.
The question regards keeping the intake manifold runners the same size.??
I currently run at 6000 - 7500rpm window but one combo will go 8000rpm next year hopefully using the big trickflow intake manifold.
Thanks in advance
20220224_162126.jpg20220224_162138.jpg

I will give you my opinion on where I would be if trying to peak say 7500 and run out to 8000ish.If mine I would have intake valve about 52 percent of bore being used.I would leave my throat 91 to 91.5 of that valve.I measure my runner length from valve seat to say about 3/8" back from radius in plenum opening.So imo for that rpm I would be wanting right at 11" total runner tract.So if head port average is 5.5" then that leave same 5.5" avr of runners in intake manifold.This is my opinion and just something to think about and look at.If you had say 2.55" csa at upper runner area in head I would be looking at about 3.6" on my long runner in plenum for csa and 3.25ish on my short center runners.This can be changed with other variables as cam events etc used .Again this is just where I would be and roughly what I have used in that similar area.I like 2" 4 hole radius into open spacer for general tuning.I like to have carb blades away from floor of manifold etc.

I wish I could get my 350/360hp Super Stock engine at 11" total. The E is the only manifold that fits under the hood. So I'm at 5.140 head and 5.000 manifold, But it has a ton of taper from 3.500in at plenum to 1.95 at head opening and 1.85 at PR. I shrink the manifold and it kills power. These peak at 7300 and trap at 8800 with 10.140 total.