Xu10J4Rs Camshaft

[Kapi306 0]

Hi!

 

What is the best camshafts for everyday use?

I already use pt81 cams, but this has too much overlap...

[Anthony 1,003]

The obvious question is what are you running piston wise, as the standard cutouts are typically the limiting factor with cams on the RS engine?

 

Also, what management and induction - I'm guessing standard in both cases if you're saying PT81's have too much overlap.

[welshpug 1,657]

PT81's are pretty mild, I have run PH2's which aren't too dissimilar and I haven't had any issues at all even on a standard unmapped ecu, also passed emissions tests without issue.

 

only way I can think overlap is too much is if cam timing is wildly out.

[Kapi306 0]

When i timed it correctly, the vacuum disappears.

 

On standard timing mark has no issue, but no power...

Edited April 19, 2016 by Kapi306

[welshpug 1,657]

there are no timing marks, you need to time them up with a dial gauge.

[Kapi306 0]

Yes, i known,

 

I havent got any problem, when i use the cams on OE mark. without timing at 110'.

[petert 586]

Do you know what lift @ TDC the cams are now?

 

If it where mine, I'd set the inlet at 109, exhaust 112.

[welshpug 1,657]

kent spec is 110 on both, 1.65mm lift @ tdc inlet.

 

my ph2's were also 110 degrees but 1.4mm.

[Kapi306 0]

I think I found the problem.

 

I measured the full lift of each cam.

 

Results: 10.58 mm to 10.8 mm ​

[Kapi306 0]

https://www.dropbox.com/s/61iwktiudvqgwqg/2016-04-20%2009.26.22.jpg?dl=0

Edited April 20, 2016 by Kapi306

[welshpug 1,657]

nothing wrong with that much lift, its beyond 10.9 iirc you will have issues with the springs

[Kapi306 0]

10.6 mm is too small. it has lot of wear..