Intake manifold design opinions

[bullettdsm]

Cool start. I believe that this is for NA aplication? You are staying true to your original plenum design, correct? You are going to angle down the opposite side of the plenum?

And I'm glad that you changed your design inside the plenum with the "extruding" velocity stacks. I disagree with that design for a few different reasons (I'm aware that it is being used out there on some 4g63 aftermarket intakes. I still don't agree with its design). Though I believe that you should absolutely have a velocity stack entrance on the floor to each runner (or at least be as smooth as possible on the entrance to the runner. It should be a smooth waterfall, not an abrupt 90*). So obviously, in order to do that, you would need to open her up to get to that connection.

As for the angle of entry into the head; if you look at the Venom intake (or its knock off OBX intake) you will see that they also give the runner air flow a slight angle of entry (obviously over a longer distance).

Any chance you know what your plenum volume is going to end up to be?

Good start

MB

Edit in: as I re-read, I see you are talking about low boost. By the size of it, I could see low boost or NA use on this. Be aware that your "theory flows" (for lack of a better term, ) seem to be based on drawing the air in and not forcing it in (correct?). In my opinion, there is a difference between drawing air in and forcing it in, but obviously, you are just using the "flows" as a starting point.

As for the angle of the TB; I'm not sure I'm there yet. I'm wondering if you end up feeding the #4 cylinder better and starving the #1 cylinder more. Just food for thought.

 

[bastarddsm]

The rule of thumb I've heard is make the plenum 1.5 to2 times the engine displacement. Leaning towards 2 times for super high rpm stuff.

The problem is in a turbo app, the turbo itself has the biggest control over the powerband. Even at low boost. So it ends up being real hard to tell if you manifold actually increased top end power.

 

[eclipserst96]

You could make a wedge type manifold big to small to allow airflow to momentarily pass intake runner #4 and force itself into #1 cylinder and work its way back. Also maybe used staged slanted velocity stacks as used in modern crotch rocket intake boxes.

 

[junkyarddsm]

So it has been a long time seen I was able to work on the intake. I got some real work done on it. I was able to finish up the port and polish on the flange and weld 90% of it together. The weld look like dirt but really strong and good penetration. Should have it done by this weekend. I am also posting another intake I am building as well input on the other would be great(it bolts to the half manifold)

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This last picture is of the half manifold I am working on.

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[codym]

Personally I really like it bro. I did a quick browse through the posts, and didn't catch it but do you know what size TB your running?

 

[turboglenn]

Nice TIG JUnkyard DSM, I have the same one, wouldn't go back to a transformer machine for the life of me after having the adjustable wave, freq, pulsing and all the other goodies of a dynasty DX


bulletdsm,, what's the LTH?

 

[bullettdsm]

bulletdsm,, what's the LTH?

This;

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Unfortunately, the only one I know of. Made by Mark Peachy, to my specs, out Wisconson way (disappeared from DSM's a couple of years ago).

I'm in the slow process (due to relying on others for some parts), of putting together another one for my daily. It was one of the keys to going over 200whp NA (and judging from attempts by others, it may be a necessary item).

MB

 

[junkyarddsm]

New pictures of it all welded up and starting the finial mock up for the install. I drilled and taped in all the sensors along with the tb. I still have to install the fuel rail bracket and throttle cable bracket but for the most part its done. I am going to clean it up and paint it.

I also decided to drop down from the 65mm tb to a 60mm. I am going to see how it runs before I make the jump to 65mm may not need it. The spacer is a clearance part that I wanted not a try to gain more power just to make sure that no one mistakes it for that reason.

The welds look like dirt My friend and I took turns welding on it due to I kinda did it during work . They are strong tho and in the end that is all that matters right . Thank you to every one with the comments and ideas once I get this installed I will post more pictures. Also I have a ton of pictures in my photobucket album that I am not posting take a look though if you want to see more.Pictures by junkyarddsm - Photobucket

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[codym]

I wish I knew how to weld I've tried a few times and failed miserably. Actually doesn't look to bad. Are you painting it at all or just leaving it like that?

 

[junkyarddsm]

It is going to be painted gun metal.

 

[necrotopsy]

that's pretty neat. wonder how it compares to stock.

i want those long tubes....

 

[codym]

Big fan of gun metal. Did you make your own fuel rail too? I couldn't tell.

 

[junkyarddsm]

No the fuel rail was cusom made by RMR and is really nice and well built.

 

[codym]

It looks great. What size injectors you running?

 

[junkyarddsm]

Their will be stock injectors for now and 310cc ford red tops once I get the supercharger kit in and running. megasquirt will be my way to tune. I have a thread open on all the info to the supercharger if you want more information.

 

[codym]

I'll check it out. Hope the rest of the build goes well bro. Try and post some pictures once you get everything mounted.