19 replies to this topic

[chris_uk]

im just ordering all my new parts from karo and i can get the blower cams for an extra £355.. question is.. are they worth it.

i already have the stage 1 cams is it really going to make that much difference.

here are the specs

Stage 1 Cams
Cam Style: Hydraulic roller tappet
Basic Operating RPM Range: 2,600-6,800
Intake Duration at 050 inch Lift: 210
Exhaust Duration at 050 inch Lift: 212
Duration at 050 inch Lift: 210 int./212 exh.
Advertised Intake Duration: 252
Advertised Exhaust Duration: 256
Advertised Duration: 252 int./256 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.423 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.419 in.
Valve Lift with Factory Rocker Arm Ratio: 0.423 int./0.419 exh. lift
Lobe Separation (degrees): 111

Blower Cams
Cam Style: Hydraulic roller tappet
Basic Operating RPM Range: 2,800-7,000
Intake Duration at 050 inch Lift: 210
Exhaust Duration at 050 inch Lift: 218
Duration at 050 inch Lift: 210 int./218 exh.
Advertised Intake Duration: 252
Advertised Exhaust Duration: 262
Advertised Duration: 252 int./262 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.423 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.436 in.
Valve Lift with Factory Rocker Arm Ratio: 0.423 int./0.436 exh. lift
Lobe Separation (degrees): 113

my revlimit with the new valves etc is going to be 7200rpm, so ideally id need the 7000 revs from the stage 1 cams, but are the other bits much better or what?

[techieboy]

Blower cams were worth 30+bhp on my car.

[chris_uk]

Blower cams were worth 30+bhp on my car.

thats from standard..

i already have 270bhp on stage 2

[The Batman]

standard being stage 2 blower cams all the way, my NA piper cams did nothing but complicate matters oh and i had 275 and fitted the cams which then went up to 300

Edited by joe_589, 16 September 2010 - 07:07 PM.

[techieboy]

Blower cams were worth 30+bhp on my car.

thats from standard..

i already have 270bhp on stage 2

Okay. Well, in that case, having them fitted meant I had 285bhp straight away. So a 15bhp increase over your Stage 2 cams at 7000rpm.

[chris_uk]

but looking at the actual stats of the cams, there are very very small differences.. im still not convinced you cant see 300bhp with these cams.. nobody has ever tried to my knowledge. i just think that the power will be seen higher in the rev range.

[The Batman]

get those cams and tell us the results then my piper one off cams where 266

Edited by joe_589, 16 September 2010 - 07:08 PM.

[chris_uk]

ah sh** ive been lookin at them on the website and got them back to front im still not convinced i wont see it tho.. lol anyone want first dibs on these cams i have?

[The Batman]

im confused, what cams you selling stage 1 comps?

[chris_uk]

yea, karos stage 1 comp cams

[vocky]

NA cams tend to be a longer duration and forced induction tend to be a shorter duration

[Mike (Cliffie)]

Those durations are not what I measured a pair of comp cams at... I saw 270 duration.

[davemate]

As i have a Saab head sitting around and waiting for me, i was wondering what my options are for cams? the saab cams are longer, so could i just go for a regrind on these to a "blower" profile? it seems mad that there is all the cutting and blocking off of oil ways when the saab cams just fit the way they were supposed to. any thoughts?

[slindborg]

Those durations are not what I measured a pair of comp cams at... I saw 270 duration.

At what lift did you declare the duration to be at?

The yanks tend to use 0.01" of lift as the start/finish of duration, where as us brits tend to go zero to zero (so appear to have longer durations)

[Exmantaa]

I only read here about the cam lobe specs, but is there not a difference in cam timing between the Z22SE (=L61) and the supercharged LSJ engine?

So maybe there's also a significant difference in timing (position of sprocket pin) between a Stage 1 (for L61) and a blower cams (for the LSJ)

Edited by Exmantaa, 17 September 2010 - 10:25 AM.

[siztenboots]

do you get rid of all overlap for an SC setup , plus by going longer duration on the inlet you will close inlet later and effectively get less dynamic compression. thats 0.436 = 11mm of lift, whats that like for clearance?

Edited by siztenboots, 17 September 2010 - 10:46 AM.

[slindborg]

some overlap would be wanted to help get rid of as much eg as possible... just not as much as regualr N/A due to the boooooooost. I had some ace cams made once, they were almost square topped as I had a limit on lift at TDC and max lift, so they started gentlyish, then abruptluy got to max lift, held for a while and dropped like a stone. The engine was surprisingly happy on them, but somewhat peaky

[vocky]

piston - valve clearance isn't an issue with any of the compcams, only the valve springs require replacing for the high lift cams, like the stage 3's = 11.8mm lift or the schrick = 12mm lift

[Exmantaa]

I only read here about the cam lobe specs, but is there not a difference in cam timing between the Z22SE (=L61) and the supercharged LSJ engine?

So maybe there's also a significant difference in timing (position of sprocket pin) between a Stage 1 (for L61) and a blower cams (for the LSJ)

Better specified here: http://www.crateengi...re/PDFS/ECS.pdf
Some specs changed in 2006 in the US engines,but there is a difference in timing NA vs. Supercharged:

The 2006MY L61 cams (=Z22SE?) can interchange with LSJ cams, both intake and exhaust. These cams are
the exact same profile, only at different timings. The 2006MY L61 timings are 116 intake, -103
exhaust. The LSJ timings are 100 intake, -115 exhaust.

Edited by Exmantaa, 17 September 2010 - 02:10 PM.

[rik]

what difference did they make?