CA Q's and tech talk...

[Kouks]

I have been doing research on the CA and its Intake Manifold Design as well as its cylinder head. Found an article comparing SR vs. CA and saying the Ca has a more sophisticated design with 4-8 runners, as well as it having 8 lobes.

How well does the stock CA head flow and would I ever need an aftermarket intake manifold, could I buy an aftermarket one? I havent seen on for the ca.

Also where can I find aftermarket head bolts.

Ive searched and couldnt find a topic like this so im throwing it out here to expand my knowledge on this.

-Brandon

[float_6969]

IMHO the SR was built on a budget. The CA WASN'T. It was buit to further Nissan technology. It is uncanny how similar the technology in the CA is to the VG30DE(TT) and RB series of motors is. I think it can safely be said that the CA was the father of the modern VG and RB series of motors. (Although since I've never seen the head on an FJ20, it might be the grandfather of the VG and RB and the father of the CA) Regardless it was phenominal tecnology for it's time, and minus the fact that it lacks some sort of VVT, it's still quite an advanced motor.

As far as flow is concerned, I've never seen a side-by-side flow comparison of the SR and CA heads so there isn't any real hard evidence to support any flow claims, either way.

There was a member on here who was building custom plenums for the CA. His business was CPC (Custom Plenum Creations). Outside of that, no, I'm not familiar with any name brand intake manifolds. I seriously doubt their nessecity for anything less than 400hp. Near or above that, I would actually consider having the intake manifold assembly and head Extrude honed. That would produce THE MOST effecient, equal and high flowing intake manifold and head combination possible.

Please use the search function regarding headbolts. It's been covered frequently. ARP carries them. They are the same as the SR20DE(T) main studs.

Do you feel expanded yet? I've got more where that came from buddy!

[c-rad]

The guy who put my engine together has a flowbench. And he just got an SR.... I will ask him if he can put my head and his on there to test them out. Should be interesting to see!

[Kouks]

Yes I would love to know that info.

And this is kinda off-topic but what kind of numbers has the CA hit(horsepower wise). SR's and KA's both claim 600+hp talk, but i havent heard more than about 350whp from a CA. too much talk about head gaskets blowing, head bolts stretching blah blah....I might just be a noob to the CA, i dunno......

[capwred]

i have seen a video of a ca getting 490rwhp but i have heard that theres higher hp ca out there just not in the us.

[float_6969]

Most of the high HP CA's are in Japan and especially the UK where there is still a good amount of aftermarket support for the motor.

[themadscientist]

there are a handful of 6 and 700hp CAs but the CA is seen less and less. I picked up a big Silvia tuning manuals the other day and in 200 or so pages there was not even a mention of the CA. No f-in respect.I don't see any similarity at all in the FJ and the CA or any other Nissan motor really. It has double timing chains and eight lobe cams on solid lifters, maybe the valvetrain a little bit I guess.

[sideways danny]

the inlet ports on the SR and CA are both "OK" the exhaust side on both is pretty poor though. the 4 port (UK spec) CA head is better than the JDM one. the standard plenum on the CA has been used for 500bhp+ in the UK quite a few times (that's about 420rwhp to you)

the CA and RB are very similar IMO, the RB has a lot more complicated bits on it though

[fanta]

CPC plenum, UK car.

Another plenum, I want to say it was a one-off from Thailand but don't quote me on the location.

[fanta]

Old pics of the original CPC prototype. It has gone through a number of revisions to improve and match flow.

Euro CA18 head.