GA16DE NVCS

[tegls1]

Sorry if this question has been asked before but I have searched but could not find any info on it. I have read on a forum about being able to install the NVCS system on an engine that was not equiped with it. Has it been ever been done before? If so What prosedures where used and where could I find some info on it. Thanks in advance.

[nametakennow]

NVCS as in variable cam system? I'd venture to say that a retrofit of that system would be essentially impossible. Many things would have to be changed, ECU, the whole cam assembly, etc.

At least, that's what makes sense in my head. Do you have a link to where you read this?

[tegls1]

I Goggled it. I will look for it again. I have a ka24de and I was looking into it. At first when I saw the cam gear I thought it worked with inertia but later found out its with oil pressure. I have found a ga16de motor at the junk yard but I dont get how the ECU controls it since I do not see any electricals by it. Does it have a solenoid to control it. Sorry for the noob questionI do not have the motor and can find any diagram of the NVCS.

[nametakennow]

Try using our FSM library and looking NVCS up a vehicle equipped with it. Link in my sig.

[tegls1]

Ok Ilooked up a few diagram but i couldn't really find anything specifically for it. But So far this is what I got. The intake cam gear works off oil pressure. I see there is an oil pressure solenoid located right by it on the intake side. Is that what controls the angle? If so How does it feed the oil to the gear? Is it sent directly or does it go through the camshaft? I want to find out all that is involved in the operation of this system.

[nametakennow]

I'm not 100% familiar with NVCS. It sounds like a precursor to Nissan's current valve control systems. The question is what exactly does it control - lift or duration or both or what?

From there I can probably make more sense of how it works. My guess is that it controls duration via oil pressure, as lift would require a separate or variable cam assembly itself. Assuming my guess is correct, angle stays constant while timing changes.

If you want, I can put this in our engineering forum. Someone in there is more likely to have a true understanding of how this all works.

Here's a link to that forum for if/when you want me to put it this thread in there - zeroforum?id=88

[tegls1]

It this engine it only controls the cam angle. It think it gradually retards the cam throughout the RPMs up to 20 degrees. It does not control valve lift. The cams look like a set of regular cams. The problem I am having is I dont know how does the actuator in the cam gear work. I believe it works on oil pressure but I do not know where does it get the pressure from. Yah that would be great if you could post it for me. i just looked at the post I read earlier and all he said was that he herd someone do it before.

[nametakennow]

Hey guys, I moved this over from Sentra Gen because it's over my head. Hopefully someone here can help this guy out.

[tegls1]

Thanks Nametakennow

hey guys, I am looking into installing the vtc system from the Sentra Ga16de into the 240sx KA24de engine. By the looks of it If I install both cam gears and the idler puller it will keep the car on timing. The rear gear is the same as the ka24de so I will not have to install the crank pulley from the GA into the KA. Now that is the easy part. I do not have the timing kit from the Ga yet so my problem is that I am not sure how it operates yet. I am going to use a megasquirt to run the system or maybe use the sentra ecu and tune it using an my eE-manage to run the KA if possible. I am most likly going to get the entire head from the GA to learn and inderstand how the system is tied into the head and how I could incorporate it to the KA.