comp cheater lobes
Originally Posted by algws6
anyone else? supposedly these are big in the mustang classes that have to weigh at least 3000 lb and are limited on what lift they can run.
Originally Posted by blubird
I am running these lobes. If you plan on using them you will need to flycut your pistons. They are very aggressive.
Originally Posted by algws6
how do you figure they are less aggressive than the XER lobes. from what i understand duration determines your P/V clearance not the lobe profile. anyone else?
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The advertised, .05 and .200 only tell part of the story. My cam is 232/236 580/580 113 icl 113 lsa, and I just pulled the heads of to discover that everyone of my pistons had a rather large semicircular divit in them. That's how I figure. Just because the LSK XER lobes have more lift doesn't mean they will make more power. Keep in mind most of the ported stock heads don't flow much more part .600 lift and some actually lose flow. So .580 lift isn't that bad.
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Originally Posted by blubird
The advertised, .05 and .200 only tell part of the story. My cam is 232/236 580/580 113 icl 113 lsa, and I just pulled the heads of to discover that everyone of my pistons had a rather large semicircular divit in them. That's how I figure. Just because the LSK XER lobes have more lift doesn't mean they will make more power. Keep in mind most of the ported stock heads don't flow much more part .600 lift and some actually lose flow. So .580 lift isn't that bad.
where your heads milled any? what size valves where you using?
Originally Posted by algws6
has anyone used these lobes before?
lobes are 3404 and 3400.
.006 .05 .200 lift
285 232 147 580
289 236 151 580
112+4
lobes are 3404 and 3400.
.006 .05 .200 lift
285 232 147 580
289 236 151 580
112+4
Using your example:
.006 .05 .200 lift
285 232 147 580 Cheater lobe
289 236 151 580 Cheater lobe
281 232 153 595 XE-R lobe
285 236 157 602 XE-R lobe
281 231 156 643 LSK lobe
285 235 160 646 LSK lobe
The aggressiveness of a lobe has to do with how fast the lifter gets off the cam base circle and into lift. The rate of lift from .006 to .050" is 53 degrees for Cheater, 49 degrees for XE-R and 50 for the LSK. The XE-R has the most aggressive ramp from .006 to .050", but the power is made after .050"...this is where the LSK lobes spank the other two lobes.
From .050 to .200", the Cheater is 85 degrees, the XE-R is 79 degrees and the LSK is 75 degrees. Basically that means the LSK lobe will give you 10 degrees more duration at .200" than the Cheater lobe with the same duration at .050" and less advertised duration. IMO, the Cheater lobes are weak. If they were the best, you'd see more people running them in LS1s.
__________________
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
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
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
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
patrick, do you know of anyone that has tried them? blu, what kind of numbers did you put down and what kind of times where you running? what were your supporting mods?
Originally Posted by blubird
Heads were 5.3s w/ 2.02 intake valves milled .01. You might be able to get away with a stock head but from my experience I wouldn't try.
i thought you had plenty of room.
https://ls1tech.com/forums/dynamometer-results-comparisons/451880-01-camaro-h-c-dyno-numbers.html
did you hit on the intake or exhaust?
I had no indication of PTV issues until I pulled the heads a couple of weeks ago. I never got any track results due various issues. I had trans problems followed by clutch problems followed by a spun rod bearing. I did notice when I pulled the intake off it appeared that #7 cylinder was not firing. All the intake ports except #7 had carbon deposits lining the port walls. #7 was completely clean. So who knows maybe once I get everything straightened out it will be respectable again.
Haven't seen them in action, but based on their specs, I'd say they'd be be between XE and XE-R lobes. Since most people are running XE-R lobes, I'd say it would be taking a step down.