ca18det 4 port intake

[cuzan0]

does anyone have a pic of a ca18det 4 port intake manifold and head???? or is willing to sell me a bare (as in no sensors and no throttle body)4-port intake manifold???

[float_6969]

Talk to Paul_S13. He's in the UK. There is also a UK forum that he's posted about, but I don't remember the addy for it.

[ants13]

The uk forum is http://www.sxoc.com/vbb

HTH

[float_6969]

Thats it! They have a b/s/t forum like we do, and you could prob find what you need on there.

[quest]

are you thinking of bolting 4 port intake to 8 port head ?Doubt it would work well even if it "bolted up". 4 port head intake ports look very similiar to a 1st gen dsm.... totally diffeent.I have both motors but no digital camera

[boost_boy]

I just don't see what's the big hype about the 4 port head. Even if it did out flow the 8 port unit, it wouldn't be by much of nothing. I wouldn't be surprised if the 8 port unit performed better than the 4 port. I see room for better turbulence from the 8 port variant as well. But in the end i always say to each his own. You want more power, get a bigger turbo, better fuel management system and crank up the boost. Or even better yet, have the head and intake runners port-matched and polished.

Dee

[r34 gtr]

im trying to remove the butterflies from my manifold but they are so burned up that the screws just strip, any ideas on how to get them out? would a drill be my best bet? my motor didnt like to properly operate the damn things so i figure ill just stop the problem at its source.

- tim

[paul_s13]

Here you go!

Its the head I ported for my old car.

Just a thought, maybe you get a better fuelmix with the 4 port head because both inlet valves get an even supply of fuel, unlike the offset injectors of the 8 port head.

[cuzan0]

the reason i asked if someone was willing to sell or have a pic of a 4 - runner intake manifold was cause i want to make a custom intake manifold with 4 - runners and one with 8 - runners wich i have the 8 - runners custom manifold made already

[fanta]

im trying to remove the butterflies from my manifold but they are so burned up that the screws just strip, any ideas on how to get them out? would a drill be my best bet? my motor didnt like to properly operate the damn things so i figure ill just stop the problem at its source.

- tim

Use am impact driver or simply drill out the screws if you don't plan on using it anymore. http://www.cvfsupplycompany.com/imdrhaheimdr.html

Make sure to use some liquid wrench and a pick to clean out the heads before you try to break them.

[quest]

I wouldn't exactly call the 4port head performance advantage 'hype'.UK guys often replaced their original failed rod bearing motors with japanese imports - first post often went something like, "where did my power go?". Quite a few guys claimed the same 4 port> 8 port... to the point where some would eventually swap over their 4p head/intake to the jdm block, while others waited until head gasket time. Even fiddling with the actuators or removing them didn't cut it. I'd think they had better things to do than to 'make this stuff up', so I for one, would be surprised if the 8 port out performed the 4 port. Of course all this based on what I've gathered from reading forums.For the continuing run of production ca18det for the uk market, Nissan spent all that money for the later 4 port casting for such limited use, when they really could've save the money. They must have known the benefits, huh. RBs share the 4port head design

[boost_boy]

I think this subject is very argumentative and that none of us is probably right or wrong. I look around at many car manufacturers and see them using the power valve and butterfly valve deal. Even nissan sports this feature loosely on it's VG series, CA series, VQ series, KA series and a few others that I can't remember. One of my all time favorites is the Yamaha powered Ford Taurus SHO which definitely sports the power valve system and it is highly effective as long as it actuated by the computer and not just normal vacuum. This is why most CA18 owners never really benefit from the butterflies and that's because they are not hooked-up and actuated when they are supposed; hence the reason for sluggish operation. I for one am witnees that on an atmo CA18DET, the butterfly valves and it's glorified power valve system is warranted and very effective. You pull the plug on it and you got a lazy engine on your hands.

Dee

[quest]

I can see the benefits in atmo motors where cylinder filling relies on vacuum from piston downstroke and port velocity, but how many boosted motors run butterflys ?

[boost_boy]

Quote »but how many boosted motors run butterflys [/quote] My point exactly! That's the point I was trying to make in a previous post, it was cheaper for them to just leave the butterfly valves their instead of reintroducing a new or the UK version head and intake manifold.

Dee

[paul_s13]

I'm just going on my experience with both heads, my old car had a jdm engine fitted when I got it, and the power I got with a T3 was 230bhp @ 13psi, after I rebuilt it (with UK head, pistons, revised homemade front pipe and mild porting I got 301bhp @ 14psi with the same turbo) the power went through the roof!

[float_6969]

Paul, do you know anybody with a flow bench over there? If so, I would love it if you could get one of those heads flow tested and post the results. I've got a friend who has one and I'm going to get it flow tested and see how it does and hopefully we can compare and definitivly settle this arguement. If I get some extra money, I may just get a UK head,mani, and fuel rail sent over here. then I'll test them both and install whichever one flows better.

[minutericesentra]

Here's a couple pics form a UK guy that I'm working on getting a head and mid-section of the manifold(I don't know what the damn thing's called, section between the plenum and head) I showed him a pic of the my RWD plenum and he said it looks like it would bolt right up to the UK mid section, so shipping will be a little less. Looks like sooo much more air could flow through there!

[float_6969]

It does look like it would flow more air. I wonder how hard/much it would be to get one here? Has he talked to you about prices at all?

[minutericesentra]

He's kinda busy with a few projects of his own at the moment but it sounds like it wouldn't be too hard grab a head and injector manifold thingy. I talked to him a couple days ago, haven't heard back from him yet but I'm not gonna rush him or anything cuz I'm also getting some B12 rear spindles to convert the rear brakes to disks very easily. So I'm sure shipping is gonna suck but it's worth it, I'll let you how much I'm gonna hafta pay when he gets back to me.

[float_6969]

[email protected] My name is Ryan. Use that.