Rb25det Tomei Poncams Problem

[tom200]

I was trying to fit my tomei poncams last night and everything was fine until........

I tried to fit the Cas unit to the front of the exhaust cam, its got a different kind of 'conection'.

Is there a difference between some of the rb25's cas unit? Mine has teeth and one locating lug that sticks out, the cam has two locating lugs...

I live in the uk and bought the cams from nengun so I am going to have to find some way of making them work, even If i have to buy a different Cas unit.

please help, anyone with photos of diffenert cas or cams?

thanks

Tom

Edited April 20, 2006 by tom200

[N I B]

R33 and R34 RB25s have different drives so you have the wrong cams

[Abo Bob]

Not only that but R33 series one and R33 series two have different CAS too.

It's unlikely you've mixed up R33 and R34 as you would have noticed the difference on the install.

[Craved]

also believe that the base circle is different on them too..

what is the product serial number for the cams you have ?

what is the month and year of your car as well??

pre oct 97 R33's all use the same cam regardless of series.. post oct 97 use the Series 2 option poncam, then r34 is different again.

[N I B]

S2 and S1 cas interchange but very late R33s have R34 cas with the black plastic cap.

[tom200]

The month and year of the car is unknown as its in my s13and I forgot he car I got it out of...... oh well...

I do know its a series two, I think it was a 96 or 97.

The cams came in a box that I chucked out, but they were for an r33. Maybe a late on with the r34 cas??

I have spoken to some guys here in the uk and I'm sure I have r34 cams so I'm going to fit r34 cas.

Thanks for the help lads.

Tom

[Craved]

you should be able to see the model it is for from your nengun recipt and match the order part number..

check the site and see whether you got the s1 set or s2 set..

[tom200]

143050

ECR33 Series 2 (RB25DET) - Duration: IN, EX 256 Lift: IN,EX 8.5mm

Thats what its says on the nengun web site.

So if I have these cams and they dont fit???? I must have a series 1 motor? unless thery sent the wrong ones... but i chucked the box now.

How can I tell quickly if i have a series 1?

Can someone post a photo of series 1 and 2 or r34 cas? I just want to know what car has the cas driven by these cams.

thanks

Tom

Edited April 20, 2006 by tom200

[GunMetalR33]

How can I tell quickly if i have a series 1?

Can someone post a photo of series 1 and 2 or r34 cas? I just want to know what car has the cas driven by these cams.

thanks

Tom

If you have a series one you should have a ignitor unit at the end of your coil pack rack at the back of the engine on the black plastic cover. Series 2 25's dont have a seperate ignitor pack.

[Craved]

also the throttle position sensor will look like a single unit on the S1 and look like a double on a series 2 .. but that still doesn't help the fact that a S2 made before oct 97 will still not be able to use these.

[N I B]

The CAS plug pinout is not the same on S1-2 as the R34 type needing the sensor wires swapped,the power and ground are the same.

Better hope you have late R33 cams and not R34 as there solid.

[T04GTR]

I was trying to fit my tomei poncams last night and everything was fine until........

I tried to fit the Cas unit to the front of the exhaust cam, its got a different kind of 'conection'.

Is there a difference between some of the rb25's cas unit? Mine has teeth and one locating lug that sticks out, the cam has two locating lugs...

I live in the uk and bought the cams from nengun so I am going to have to find some way of making them work, even If i have to buy a different Cas unit.

please help, anyone with photos of diffenert cas or cams?

thanks

Tom

get a r34 or my98 onward r33 crank angle sensor. or buy new cams. you can sell your existing crankangle sensor easy enough.

not sure on base circle but

and you need to swap the two triger wires around in the plug.. ie green/yellow green/red i think. the black ones earth the black/white is power

[tom200]

Ok mine is a series 1. it has the ignitor at the back on the top.

I'm thinking these are series 2 cams as I cant see how they woulb send r34 ones and i'm sure the box said r33 rb25det.

Is it ok to swap series1/2 cas. how much are they on here as I only found one tuner over here and they want nerly $1200au . that was for the r34 though.

I still would like to find an image of what cams / cas haved what drive, just to be sure what I have.

If they are 34 cams i'll just sell them.

[N I B]

S2 CAS is the same its only the very last R33s that had the 34 type cas.

S1 and S2's have an all alloy sensor but the late ones and 34s have a black plastic cap and a very different drive.

[tom200]

I quickly made this models up to show what the difference is. If anyone can be sure what the tomei one is for, then please tell me.

My old cams have this to drive the cas - images 1 and 3

the tomei cams have this kind of drive, anyone know what car this is for? - images 2 and 4

-

once again, thanks for the help.

Tom

old tomei old tomei

Edited April 20, 2006 by tom200

[N I B]

You need the 34 type now

[tom200]

You need the 34 type now

yay , progress!

thanks mate

How much are these over there?

[N I B]

Not a common thing on the market so id hate to guess a price for one.

[bluefire]

I am bumping this thread up because I seem to have the same problem. My motor is a SII rb25det (without ignitor). I just bought some tomei poncams part# 143050 and the cam angle sensor is different. Is it confirmed that I have to get an r34 cas and that it will work with my motor?

-Bluefire

[Tony de Wonderful]

Bump

Was this ever resolved? What cams are in the very late S2's with the black CAS? Is it cams from the Neo engine???

According to wiki the RB25DET and Neo cams are different profile:

RB25DET Camshaft duration 240°in, 240°ex lift: 7.8mm in, 7.8mm ex

RB25DET NEO Camshaft duration 236°in, 232°ex lift: 8.4mm in, 8.7mm ex

So Nissan would have either have had to machine a special cam to accept the black CAS, or just take the upcoming Neo cam - when they were building the very late S2's.

Edited June 4, 2011 by Tony de Wonderful