LSK lobes for a daily driver?
08-23-2008, 07:14 PM
#21
The XE-R lobes are super fast off the seat. They only need 49 degrees to go from .006" to .050". XFI intake, LSL and LSK lobes are slower at 50 degrees. XFI exhaust lobes are slower at 52 degrees and XE high lift lobes are closer to 54 degrees. At 49 degrees, the XE-R lobes get lots of valve bounce and make lots of valvetrain noise. To control the harsh opening and closing, Comp recommends using a dual valve spring for the XE-R lobes. Primarily for the enhanced pressure when closed compared to beehive springs. 918 and 1518 springs are not always successful of controlling XE-R lobes but they seem to do better with the newer XFI lobes. Valve weight has something to do with this too. Hollow stem 2.0" Z06 valves are easier to control than aftermarket stainless 2.02" and 2.055" valves. Stock 2.0" LS1 valves are not exactly light either.
08-23-2008, 08:54 PM
#22
The Xtreme Marine have high lift (.646") like LSK lobes, but they have slower ramps off the seat (54 degrees vs 50). I have spec'd them in the past. The high lift scares a lot of the street crowd, but they're a solid hydraulic lobe.
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
Custom LSX tuning in person or via email press here.
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
Custom LSX tuning in person or via email press here.
08-24-2008, 03:48 AM
#24
TECH Senior Member
Ramp rate affects the speed at which your valves open and close.
We all have seen good results from mixing lobes.
I like XFI intake and XE-R exhaust up to 4* split difference
There is also XE-R intake and XE high lift Exhaust.
Different cam designers have different visions and protocol, I have mine, Patrick has his, Ed Curtis is another to name a few.
The cam chosen doesn't make miracles, the rest of the combo has to support the cam's parameters. Install protocol is a huge factor and of course tuning.
Put all of these ingredients into a combo and you'll have a nice recipy for desired power range and level.
We all have seen good results from mixing lobes.
I like XFI intake and XE-R exhaust up to 4* split difference
There is also XE-R intake and XE high lift Exhaust.
Different cam designers have different visions and protocol, I have mine, Patrick has his, Ed Curtis is another to name a few.
The cam chosen doesn't make miracles, the rest of the combo has to support the cam's parameters. Install protocol is a huge factor and of course tuning.
Put all of these ingredients into a combo and you'll have a nice recipy for desired power range and level.
