Rallye and XSi cam specs

[sandy309]

I've measured the inlet side of the cams, exhaust to follow. The 1.3 Rallye, 1.6 Rallye and 1.6 XSi all use the same cam, stamped "J" on the flywheel end. The 1.4 XSi uses a different cam, stamped "Z" on the flywheel end.
Headline specs:
"J" cam:
Peak lift 10.6mm
Duration at 0.1mm lift 270 degrees
Duration at 1.0mm lift 235 degrees

"Z" cam:
Peaklift 10.3mm
Duration at 0.1mm 270 degrees
Duration at 1.0mm 234 degrees

Here are the lift curves:


They are almost identical, peak velocity is about the same, but at the "J" cam has a slightly more aggressive opening slope, opening acceleration and marginally more lift, that's about it.

[rajjinator]

good info! much of a gain to be had on say a 1.4 xsi then with the rallye cam?

[sandy309]

Nominal I would think, probably a slight change of induction note more than anything!

[Louis]

I was always under the impression the 1.4cam was meatier but clearly not. good work sandy, imformative and helpful as always.

I wouldnt say you'd notice any diff in the cams looking at the graph tbh. not worth the effort...

[HuddRallye]

If the standard Rallye "J" cam has 10.6mm peak lift then doesn't that mean that it has more lift than the newmans PH4?? As on their site it says the PH4 has 10.3mm of lift.

http://www.newman-cams.com/pdf/peugeot.pdf

I'm probably reading it wrong but just thought I'd ask.

[sandy309]

The Newman PH4 actually lifts the valve 11.5mm peak, the specs they publish on the site doesn't seem to correlate in an obvious way with the actual profiles I've received. I don't know why that is and I'm not complaining, because the profiles I've had from them so far have been closer to what I wanted than the actual spec. I've plotted the curve for the PH4, I do it for every cam I use to help me develop the rest, but I don't know that my various cam suppliers would be too chuffed if I published their profiles publicly! If they weren't concerned, I'd imagine the curves would be available already, I wish they were.
Cams from different manufacturers are quite different and what some of the manufacturers make for the specialist engine builders are quite different in many to what's publicly available. But clever cam design/choice isn't much use without knowing what else is needed anyway.

[sje00]

Sandy, sorry to grab the thread, but do you have the Bhp/torque graph and AFR graph for a standard S2

[sandy309]

I don't, sorry!

[sje00]

any chance you know where i could get them??

[loudandproud205]

i havnt searched but by any chance do you have the info in standard vts cams? as from rolling road results i have every one seems to think its cammed but in all honestey i have no idea

[sandy309]

I was going to measure the J4 cams next, when I get time!!

[loudandproud205]

thanks sandy if you could let me know when you do and which i need to measure to try find out the cams fitted to my car would be very greatfull

[will_1988]

The Newman PH4 actually lifts the valve 11.5mm peak, the specs they publish on the site doesn't seem to correlate in an obvious way with the actual profiles I've received.

really?!?! would that not be false advertising or something along them lines?!

[sandy309]

I'm not sure about the legal implications, but there's no apparently accepted standard for measuring cam profiles. It's been common practice for years for profiles to be described according to where they fit in the range, rather than the actual duration etc.
I measure the lift curve at the valve, with the advised clearance (0.2mm for these), which is as close as possible to what actually occurs in use. With rockers, the exact lift profile at the valve isn't as consistent as with bucket followers and at speed, the valve movement will vary according to the flex and rebound of the valvetrain too.

I'm not sure about the legal implications, but there's no apparently accepted standard for measuring cam profiles. It's been common practice for years for profiles to be described according to where they fit in the range, rather than the actual duration etc, much like recent BMW 316s having 1.9 litre engines I guess!
I measure the lift curve at the valve, with the advised clearance (0.2mm for these), which is as close as possible to what actually occurs in use. With rockers, the exact lift profile at the valve isn't as consistent as with bucket followers and at speed, the valve movement will vary according to the flex and rebound of the valvetrain too.

[freddy6868]

hi just a quick question if not a stupid one but did you measure the cam with a DTI plunger while the cam was still in the engine?