LSK with smaller lift?
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Teching In
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LSK with smaller lift? Would a lsk lobe with less then the normal lift for lsk lobes be of any help?A 224 xer lobe has .581 lift,would a 224 lsk lobe with .600-.610 be worth doing?What would be the normal lift for a 224 lsk lobe?If you have a lsk lobe with the same lift as xer lobe would it make more power or be much harder on the springs than the xer lobe?Thanks!
Have a look at the XFI lobes
Code:
Lobe# .050 lift Adv .200 3010 202 0.585 252 128 3011 206 0.590 256 132 3012 210 0.595 260 136 3013 214 0.600 264 139 3014 218 0.605 268 143 3015 224 0.609 274 149 3016 230 0.612 280 154 3017 236 0.615 286 159 3018 242 0.621 292 165 3033 212 0.580 264 135 3034 218 0.590 270 141 3035 224 0.600 276 147 3036 230 0.604 282 152 3037 236 0.607 288 158 3038 242 0.612 294 163 3039 248 0.615 300 169
Here are all the comp 224 lobes I have, in ascending order by lift.
Note that the XE-R, XFI and LSK all have simular durations at the seat and .050, and that the XFI and LSK have the same durations at .050 and .200
Code:
Series Lobe # Adv. .050 .200 Lift
Extreme RPM 3753 278 224 137 0.534
Extreme RPM HL 3715 277 224 142 0.568
XE-R 3722 273 224 146 0.581
XFI 3015 274 224 149 0.609
LSK 2126 273 223 149 0.636 Trending Topics
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Teching In
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So the ramp rate won't be much harder on them?I have a set of RHS 210 that I bought bare when they first came out and that was the only way to get them.I had them set up with double springs good to .650 but told the guy setting them up that I wouldn't be going but maybe a hair past .600 because I didn't want to push things to their limit.I don't mind having to change springs every 10,000-15,000 miles but don't want to have to worry to much about breaking springs before that.This is not a max effort engine just want to get all of the ponys I can without making it a total parts eatter or a pain to drive.Thanks for all the help!
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I called Comp and they said the down side XFI lobes would be alittle harder on springs and make alittle more noise.On the up side they would probably make about 6 hp across the whole rpm band.Does that sound about right?
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From: Naperville, IL
Yes.. and LSK are even a bit harder on springs, but will make a bit more power than the XFI..
..at each given duration, the XFI will have the valve open farther for longer than the XER, and the LSK will have the valve open farther for longer than the XFI (assuming ramp rates are folling the trend showed earlier). You've seen a head flow sheet, and heads flow more air at higher lifts until they start to back up, but generally that's well over .600 lift, typically beyond .650.
2-valve engines love lift. I went with an LSK intake lobe myself. I've been told that the LSK lets the valves down easier than the XER too.. reducing chance of valve bounce.
..at each given duration, the XFI will have the valve open farther for longer than the XER, and the LSK will have the valve open farther for longer than the XFI (assuming ramp rates are folling the trend showed earlier). You've seen a head flow sheet, and heads flow more air at higher lifts until they start to back up, but generally that's well over .600 lift, typically beyond .650.
2-valve engines love lift. I went with an LSK intake lobe myself. I've been told that the LSK lets the valves down easier than the XER too.. reducing chance of valve bounce.
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Thanks for all the help!Thought I'd let yous know that I decided to play it safe and stick with a smaller cam with XER lobes.I orderd the Comp 54-444-11 (224/230 .581/.592 114+2).I fugured since no matter wich cam I go with theres a chance I might wish I had picked a different and want to change it agin.If so I would rather be putting a bigger one in for more power than putting a smaller one in because it is a pain in the *** to drive.It would probably be awhile before I could afford to do it agin and it will be eaiser to live with a small (cam) mistake than a big (cam) mistake.Thanks agin!Bob