My custom intake mani, ka24/naps-z

[seang]

It isn't actual size, but the basic shape is there. I think a Weber, or 2bbl Holley would be good here.[IMG][/IMG]

[Drift21_Hardslider]

Why are you going with a Carb? What are you doing about the water ports on the NAPS-Z?

I'm blocking them off on my ITB intake.

[seang]

For now, this only exists on paper and in my mind. I'm not gonna carb the ka24 in my 97 HB, this was just an exercise of creativity. The basic design can be altered for proper tube diameter and length, as well as carb plate design. I think this shape is ok if you didn't want to go with sidedrafts. Vacuum accessories could all hook up, as well as the PCV. IDK about the water ports, I've never even had my intake manifold off the ka24 or the old naps-z. Hot water has no place in my intake manifold design, and a thermal gasket would be in store should I actually make this thing. If its too cold to idle, pull the choke.
Modified by seang at 1:44 AM 8/23/2009

[Drift21_Hardslider]

Yeah, the Z24i has water ports in the intake. <intake is off on my truck now>

[seang]

[IMG][/IMG]I think this one is better than the first. This one has runners of exactly the same length. The first one's runners are shorter at cyl's 2&3, and longer at cyl's 1&4, seemingly only slightly, the real thing would have different dimensions than the drawing, amplifying the difference even more. Anyhoo, I like this one better. For a stockish ka24 making peak torque at 4400rpm, the runners would ideally be 19.09 inches long for best resonance, but since this is too long, I divided it by half to 9.545 inches which I think could fit in the engine bay, and if thats still too long, I divided by three to 6.363 inch runners. The runners would ideally have an inner diameter of 1.5266 inches. Note that I said this was for ka24 or naps-z, but the naps-z24 makes peak torque at 2800 rpm, which would necessitate different runner sizes for best resonance, no biggie.PS, carb plate in drawing is cut (ideally) for 350cfm Holley 2bbl
Modified by seang at 2:04 AM 8/23/2009

[Drift21_Hardslider]

A crazy idea I had using a double pumper carb. to make a type of individual fuel intake. The runners would be a pain, though.

[seang]

A crazy idea I had using a double pumper carb. to make a type of individual fuel intake. The runners would be a pain, though.

I can see exactly what you're saying, but IDK if thats a good idea altogether. It would be more compact than running 4-1bbl downdrafts, but the double pumper is made to work as a unit, not as individual runners. LIke I said IDK how 4bbl carbs work, so...

[Drift21_Hardslider]

I can see exactly what you're saying, but IDK if thats a good idea altogether. It would be more compact than running 4-1bbl downdrafts, but the double pumper is made to work as a unit, not as individual runners. LIke I said IDK how 4bbl carbs work, so...

If what I've been told is correct, a double pumpers' secondaries can be opened with the primaries. IDK, I don't work with carb.s.

[seang]

I have no idea how a double pumper works, so don't take my word for it. Nice thinking though.

[PEZi]

i'd like mikunis with a custom intake... its a little easier intake to make than yours because the ports don't all have to come into one.... and you get much better performance!

[Drift21_Hardslider]

Where the heck can I get this?? That would be easier for me, too!

[seang]

i'd like mikunis with a custom intake... its a little easier intake to make than yours because the ports don't all have to come into one.... and you get much better performance!

The manifold I drew up has tuned runners that can be made for any given torque curve. I think the line between a DCOE setup, and my little design could be a thin one.

[PEZi]

Where the heck can I get this?? That would be easier for me, too!

well... you can get them by searching 'mikuni side draft carbs' in classifieds... ebay etc.

you'd of course have to be cool with dealing with carbs tho

and a little secret.... they're not cheap... you need 2 for a 4 cyl and each costs more than a weber

The manifold I drew up has tuned runners that can be made for any given torque curve. I think the line between a DCOE setup, and my little design could be a thin one.

i'm interested for sure man... just let me know how it works out because this plus a weber is bound to be cheaper than running mikunis

[seang]

It'll be a while, Pez before I ever build something like this. I have been unemployed for a year and a half and the only reason I have any Nissan is because my Mom helps me pay for it, I am in Michigan you know. Oh well, I can see past it, and I'm taking it into my own hands : )

Oh, the reason for this post. Aren't Mikuni sidedrafts exactly like a Weber DCOE? I thought they were shared designs.

[Drift21_Hardslider]

I wasn't talking about the carb.s, but the manifold itself. I can adapt it to use my throttle bodies.

[PEZi]

Oh, the reason for this post. Aren't Mikuni sidedrafts exactly like a Weber DCOE? I thought they were shared designs.

basically yes... but people have less issues with mikunis

I wasn't talking about the carb.s, but the manifold itself. I can adapt it to use my throttle bodies.

nice... for some reason i didn't even thing of that

[Drift21_Hardslider]

BTW, I did find a lower manifold for the DCOE setup, but at $380, it's not something I can afford right now considering I still need a 'cage, 5-point harness, firesuit, seat, suspension (dampers at least), and a few other parts. With two months to go, I have to focus priorities and can always build the manifold after I get to California.

[seang]

I hope you do well, drift21hardslider, and achieve the goals you have set forth in your racing agenda.

P.S. Gran Turismo can be excellent practice.

[Drift21_Hardslider]

I hope you do well, drift21hardslider, and achieve the goals you have set forth in your racing agenda.

P.S. Gran Turismo can be excellent practice.

Actually, I'm using Baja: Edge of Control.

[seang]

OK, I have been thinking about BS carbs, now I have another idea. Take the stock components off my truck style ka24e manifold (downdraft throttle body w/integrated MAF, all 4 injectors, vacuum accessories, and fit them onto the new manifold. It seems practical because the stock throttle body mounts just like a carb or TBI would. I would have to add the injector bosses on the runners. This would utilize all the stock parts. What do you think?

[Drift21_Hardslider]

OK, I have been thinking about BS carbs, now I have another idea. Take the stock components off my truck style ka24e manifold (downdraft throttle body w/integrated MAF, all 4 injectors, vacuum accessories, and fit them onto the new manifold. It seems practical because the stock throttle body mounts just like a carb or TBI would. I would have to add the injector bosses on the runners. This would utilize all the stock parts. What do you think?

I say if you're going to do that, just use a 240SX intake. I've got a spare one lying in my truck.

[seang]

I say if you're going to do that, just use a 240SX intake. I've got a spare one lying in my truck.

That would work, but I want something more eccentric than that.

I was digging around in the engine compartment the other day, and I realized I could utilize the full 19.09 inches of the runners which would ram air into the cylinders. The stock manifold already does this kind of well, but I think I could still optimize it more. I have found a company that does custom size aluminium tubing, so that part is taken care of as long as its not too pricey, by which I mean anything more than cheap. I would mock the runners up using PVC U-bends and pieces of pipe before finishing in alminium. It would take some time to get them exactly the same length. 19.09 inches isn't really that long, and it would fit under the bonnet for sure. Mind with runners that long, I would be sticking with the stock fuel injection instead of a carburetor. I say stock FI components because I already have every piece, and it would keep the costs down.

PS, the more I think about this project, the more impractical it becomes. The only reason I continue to talk about it at this time is that it gives me something to think about.

[Drift21_Hardslider]

That would work, but I want something more eccentric than that.

I was digging around in the engine compartment the other day, and I realized I could utilize the full 19.09 inches of the runners which would ram air into the cylinders. The stock manifold already does this kind of well, but I think I could still optimize it more. I have found a company that does custom size aluminium tubing, so that part is taken care of as long as its not too pricey, by which I mean anything more than cheap. I would mock the runners up using PVC U-bends and pieces of pipe before finishing in alminium. It would take some time to get them exactly the same length. 19.09 inches isn't really that long, and it would fit under the bonnet for sure. Mind with runners that long, I would be sticking with the stock fuel injection instead of a carburetor. I say stock FI components because I already have every piece, and it would keep the costs down.

PS, the more I think about this project, the more impractical it becomes. The only reason I continue to talk about it at this time is that it gives me something to think about.

Eh, impractical is in the eyes and thoughts of their beholders.

[oldtown driver]

gotta be honest , im new in the world of fuel injection but have experience with carberaters via american muscle and i dont ever want another carb as long as i live since iv'e seen the future. none the less i hope it works and wins your races.

[Asuncion]

They are currently 9-16-09 listing this setup on EBAY auction number 310164293153 so I hope that helps someone