LSK Lobes: Are they making more power?
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TECH Senior Member
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From: Bethesda, MD
LSK Lobes: Are they making more power? Has anyone tested an LSK lobed cam against an XE-R cam of same duration and overlap to see if there is any real world gain from using these lobes?
e.g. a 223/223 114 LSK cam vs a 224/224 114 XE-R cam or maybe a cam with LSK lobes on the intake and XE-R on the exhaust?
From previous posts:
and
Compared to an XER, it looks like (on an eyeball basis) for a given duration at .05 the LSK lobes have:
1* more duration at .006
3* more duration at .200
.05" more lift, but the gap decreases in the bigger durations
Anyone know the extra area under the curve for these lobes?
e.g. a 223/223 114 LSK cam vs a 224/224 114 XE-R cam or maybe a cam with LSK lobes on the intake and XE-R on the exhaust?
From previous posts:
Code:
Comp Cams LSK lobes Lobe#, Dur. @ .006", .050", .200", & Lift w/1.7 rocker 2124 265 215 142 .629" 2125 269 219 145 .632" 2126 273 223 149 .636" 2127 277 227 153 .639" 2128 281 231 156 .643" 2129 285 235 160 .646" 2130 289 239 164 .649" 2131 293 243 168 .653" 2132 297 247 171 .656" 2133 301 251 175 .660" 2134 305 255 179 .663" 2135 309 259 183 .663" 2136 313 263 186 .663"
Compared to an XER, it looks like (on an eyeball basis) for a given duration at .05 the LSK lobes have:
1* more duration at .006
3* more duration at .200
.05" more lift, but the gap decreases in the bigger durations
Anyone know the extra area under the curve for these lobes?
I've been putting together some heads cam packages with the LSK lobes 
I'm currently looking for someone wanting to be a test car for the heads cam package
I'm currently looking for someone wanting to be a test car for the heads cam package
__________________
Jason
Co-Owner, Texas Speed & Performance, Ltd.
2005 Twin Turbo C6
404cid Stroker, 67mm Twins
994rwhp/902lb ft @ 22 psi (mustang dyno) www.Texas-Speed.com
Jason
Co-Owner, Texas Speed & Performance, Ltd.
2005 Twin Turbo C6
404cid Stroker, 67mm Twins
994rwhp/902lb ft @ 22 psi (mustang dyno) www.Texas-Speed.com
Originally Posted by Jason 98 TA
I've been putting together some heads cam packages with the LSK lobes I'm currently looking for someone wanting to be a test car for the heads cam package
I'm currently looking for someone wanting to be a test car for the heads cam package 
I'd love to.........thought you'd never ask. Trending Topics
you can see Tony's results of the 239/242 LSK lobed cam he tested out in his 383, the results were less then steller. it made more peak over the 234/238 XE-R but it was decimated in under the curve hp and tq.
check the dyno section.
check the dyno section.
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kinda want to try that 2129 lobe (ON A 408)..... but just THE THOUGHT of having to change out valve guides all the time on a $3000+ set of heads has me worried... I mean those are some AGGRESSIVE LOBES. Am i wrong? with these lobes not be MURDER on our heads?
Originally Posted by dame
kinda want to try that 2129 lobe (ON A 408)..... but just THE THOUGHT of having to change out valve guides all the time on a $3000+ set of heads has me worried... I mean those are some AGGRESSIVE LOBES. Am i wrong? with these lobes not be MURDER on our heads?
I'll have to find that thread JRP, those are interesting results for sure. I might just have to stick with the trusty XE-R's.
Thread Starter
TECH Senior Member
iTrader: (7)
Joined: Nov 2001
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From: Bethesda, MD
I'll see if I can figure out which dyno post you are referring to. The classic test would be to do similar lobes on a same day swap & dyno or close to it.
Maybe we'll find out if head flow over .600 is as good as reported.
Maybe we'll find out if head flow over .600 is as good as reported.
On The Tree
Joined: May 2005
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Originally Posted by jrp
you can see Tony's results of the 239/242 LSK lobed cam he tested out in his 383, the results were less then steller. it made more peak over the 234/238 XE-R but it was decimated in under the curve hp and tq.
check the dyno section.
check the dyno section.
I would think a more valid comparison would have been to compare the 234/238 XE-R cam to a LSK-cam that is 231/235 where the over .200" duration numbers are more similar. That 239/243 (2?) is comparable to a 244/248 XE-R cam, so I am not surprised at all in a big drop in under the curve hp and torque as compared to the 234/238 in a 383.
Originally Posted by gtovan
_____________________
I would think a more valid comparison would have been to compare the 234/238 XE-R cam to a LSK-cam that is 231/235 where the over .200" duration numbers are more similar. That 239/243 (2?) is comparable to a 244/248 XE-R cam, so I am not surprised at all in a big drop in under the curve hp and torque as compared to the 234/238 in a 383.
I would think a more valid comparison would have been to compare the 234/238 XE-R cam to a LSK-cam that is 231/235 where the over .200" duration numbers are more similar. That 239/243 (2?) is comparable to a 244/248 XE-R cam, so I am not surprised at all in a big drop in under the curve hp and torque as compared to the 234/238 in a 383.
Originally Posted by Beast96Z
I would think the optimum comparison would be between 2 of the same size cams. If you have a 234/238 XE-R, test it against a 233/237 LSK and see if the power is better or worse for a givin .050" duration.
I agree.
Originally Posted by gtovan
Only problem, those durations are not available in the LSK series.
On The Tree
Joined: May 2005
Posts: 140
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Originally Posted by Beast96Z
OK, the 235/239 then. I think you see where I'm going. The only true way to tell if one lobe is better than another is to test it against the same size lobe.
I agree that would be an interesting comparison.
Staging Lane
Joined: Jul 2006
Posts: 78
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Originally Posted by dame
kinda want to try that 2129 lobe (ON A 408)..... but just THE THOUGHT of having to change out valve guides all the time on a $3000+ set of heads has me worried... I mean those are some AGGRESSIVE LOBES. Am i wrong? with these lobes not be MURDER on our heads?
