[Z06] Cam spec Question.
10-10-2013, 10:59 AM
#1
Cam spec Question.
Just got a cam spec'd out from the shop ill be going through, and im just wondering what the expected rwhp will be. I kind of have a good range what itll be, which im assuming will be around 550-580rwhp. I would like to break the 600rwhp mark, but that will probably require a big cam like the gt21 cam or ls7r cam. Any thought?
I will have the following supporting mods-
Fast 102
ARH LTS
Stock Mufflers
Heads reworked
Air Raid CAI
102 TB
Tune
Cam spec
227/239 .625/.611 LSA 113+4
I will have the following supporting mods-
Fast 102
ARH LTS
Stock Mufflers
Heads reworked
Air Raid CAI
102 TB
Tune
Cam spec
227/239 .625/.611 LSA 113+4
10-10-2013, 11:16 AM
#2
Is that a CompCam? If so, I cannot figure out what lobes those are because the durations and lifts do not match anything listed in the lobe catalog:
http://www.compcams.com/Technical/Ca...obeCatalog.pdf
Those durations are the same as the LPE GT19 cam, but the GT19 has a lot more lift and it's on LSK lobes. Just last week I had my GT19 removed and replaced with another cam because I didn't like having such an aggressive lobe. I think it is better to get a softer lobe with more duration. Something like:
Intake:
LXL #13159, 230 duration, .644 lift
or
LXL #13158, 226 duration, .641 lift
Exhaust:
LSL #13022, 247 duration, .661 lift
114 LSA for 10.5 overlap; or 116 LSA for 6.5 overlap. Subtract 2 overlap if you go with the 226-duration intake lobe.
If tuned right, this ^ cam will drive very mannered.
Read about the lobes in the catalog I linked above.
Good luck!
http://www.compcams.com/Technical/Ca...obeCatalog.pdf
Those durations are the same as the LPE GT19 cam, but the GT19 has a lot more lift and it's on LSK lobes. Just last week I had my GT19 removed and replaced with another cam because I didn't like having such an aggressive lobe. I think it is better to get a softer lobe with more duration. Something like:
Intake:
LXL #13159, 230 duration, .644 lift
or
LXL #13158, 226 duration, .641 lift
Exhaust:
LSL #13022, 247 duration, .661 lift
114 LSA for 10.5 overlap; or 116 LSA for 6.5 overlap. Subtract 2 overlap if you go with the 226-duration intake lobe.
If tuned right, this ^ cam will drive very mannered.
Read about the lobes in the catalog I linked above.
Good luck!
Last edited by Achilles97; 10-10-2013 at 11:17 AM. Reason: spelling
10-10-2013, 11:31 AM
#3
Is that a CompCam? If so, I cannot figure out what lobes those are because the durations and lifts do not match anything listed in the lobe catalog:
http://www.compcams.com/Technical/Ca...obeCatalog.pdf
Those durations are the same as the LPE GT19 cam, but the GT19 has a lot more lift and it's on LSK lobes. Just last week I had my GT19 removed and replaced with another cam because I didn't like having such an aggressive lobe. I think it is better to get a softer lobe with more duration. Something like:
Intake:
LXL #13159, 230 duration, .644 lift
or
LXL #13158, 226 duration, .641 lift
Exhaust:
LSL #13022, 247 duration, .661 lift
114 LSA for 10.5 overlap; or 116 LSA for 6.5 overlap. Subtract 2 overlap if you go with the 226-duration intake lobe.
If tuned right, this ^ cam will drive very mannered.
Read about the lobes in the catalog I linked above.
Good luck!
http://www.compcams.com/Technical/Ca...obeCatalog.pdf
Those durations are the same as the LPE GT19 cam, but the GT19 has a lot more lift and it's on LSK lobes. Just last week I had my GT19 removed and replaced with another cam because I didn't like having such an aggressive lobe. I think it is better to get a softer lobe with more duration. Something like:
Intake:
LXL #13159, 230 duration, .644 lift
or
LXL #13158, 226 duration, .641 lift
Exhaust:
LSL #13022, 247 duration, .661 lift
114 LSA for 10.5 overlap; or 116 LSA for 6.5 overlap. Subtract 2 overlap if you go with the 226-duration intake lobe.
If tuned right, this ^ cam will drive very mannered.
Read about the lobes in the catalog I linked above.
Good luck!
10-10-2013, 11:38 AM
#4
Team Owner
That is a mild cam. My blower cam is a 230/246 116 and has no surge/etc. You could probably step it up a bit.
10-10-2013, 11:51 AM
#5
Thats what I figured with the specs like that. I just wouldnt know how big to go, without it surging or have any issues with drivability. If it was me, I would put the LS7r on there.
10-10-2013, 11:56 AM
#6
Example, if you can have the following:
Cam1 based on LSK lobes:
Intake:
LSK 227 duration, .677 lift
Exhaust:
LSK 239 duration, .688 lift
Cam2 based on LSL lobes:
Intake:
LSL 227 duration, .650 lift
Exhaust:
LXL 238 duration, .652 lift
Same durations on both cams, but Cam1 is crazy more stressful on the valvetrain than Cam2 because of the shape of the lobes:
Compcams' description of LSK:
"They are VERY hard on parts and not generally recommended in street applications!"
Compcams' description of LXL:
"...optimized with lower acceleration and a softer closing ramp for less valve train noise and better stability with higher (1.8:1+) ratio rocker arms... perform well for both the intake and exhaust when used in either LS7 or other high ratio applications"
I do not know what kind of lobes he specc'ed for you, so they may be great, but I am just trying to explain that lobe shape is very important. I learned the hard way and had to pay $2000 to swap cams because I didn't know better when I chose my first cam - all I paid attention to was the duration and it never crossed my mind that the lobe shape had such a crucial role in the health of the valvetrain.
Good luck!
10-10-2013, 12:11 PM
#7
If you want tame durations and overlap, that's fine, but also keep in mind the lobe type (LSL, LXL, LSK, etc) because that impacts the stress on your valvetrain. The valvetrain stress is almost entirely dependent on the lobe type - durations don't really matter in this regard.
Example, if you can have the following:
Cam1 based on LSK lobes:
Intake:
LSK 227 duration, .677 lift
Exhaust:
LSK 239 duration, .688 lift
Cam2 based on LSL lobes:
Intake:
LSL 227 duration, .650 lift
Exhaust:
LXL 238 duration, .652 lift
Same durations on both cams, but Cam1 is crazy more stressful on the valvetrain than Cam2 because of the shape of the lobes:
Compcams' description of LSK:
"They are VERY hard on parts and not generally recommended in street applications!"
Compcams' description of LXL:
"...optimized with lower acceleration and a softer closing ramp for less valve train noise and better stability with higher (1.8:1+) ratio rocker arms... perform well for both the intake and exhaust when used in either LS7 or other high ratio applications"
I do not know what kind of lobes he specc'ed for you, so they may be great, but I am just trying to explain that lobe shape is very important. I learned the hard way and had to pay $2000 to swap cams because I didn't know better when I chose my first cam - all I paid attention to was the duration and it never crossed my mind that the lobe shape had such a crucial role in the health of the valvetrain.
Good luck!
Example, if you can have the following:
Cam1 based on LSK lobes:
Intake:
LSK 227 duration, .677 lift
Exhaust:
LSK 239 duration, .688 lift
Cam2 based on LSL lobes:
Intake:
LSL 227 duration, .650 lift
Exhaust:
LXL 238 duration, .652 lift
Same durations on both cams, but Cam1 is crazy more stressful on the valvetrain than Cam2 because of the shape of the lobes:
Compcams' description of LSK:
"They are VERY hard on parts and not generally recommended in street applications!"
Compcams' description of LXL:
"...optimized with lower acceleration and a softer closing ramp for less valve train noise and better stability with higher (1.8:1+) ratio rocker arms... perform well for both the intake and exhaust when used in either LS7 or other high ratio applications"
I do not know what kind of lobes he specc'ed for you, so they may be great, but I am just trying to explain that lobe shape is very important. I learned the hard way and had to pay $2000 to swap cams because I didn't know better when I chose my first cam - all I paid attention to was the duration and it never crossed my mind that the lobe shape had such a crucial role in the health of the valvetrain.
Good luck!
10-10-2013, 12:46 PM
#8
Team Owner
Mine was spec'd by pat G and a bunch of other forum vendors backed up his specs. It is a 230/246 LXL LXL 116+3. 5 degrees of overlap, runs great. Makes good power, sounds good.
10-10-2013, 02:38 PM
#9
10-10-2013, 03:04 PM
#10
Team Owner
917rwhp last time I dynoed but had belt issues. Livernoise 427 with an ECS Ysi setup, ~14psi.
10-10-2013, 03:53 PM
#12
Team Owner
Do you want a blower cam like you said or a n/a cam? I suggested a great blower cam, that would still drive good and make decent power. You said you want a cam for f/I down the road.
I would expect n/a on a stock motor that cam to do 530-550 depending on other mods.
I would expect n/a on a stock motor that cam to do 530-550 depending on other mods.
10-10-2013, 04:39 PM
#13
From what ive read that high lift cams dont like boost that much. Especially with the LS7s
10-10-2013, 05:24 PM
#14
Race Director
Member Since: Dec 2006
Location: Fort Worth, Texas
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High lift cams can be harder to control on boosted cars if good springs aren't used, but peak lift isn't what determines that...ramp rates and valvetrain play a big part in stability. Honestly that's a mild cam for a LS7 and more fitting for an LS3 imo as seen in the link below, hopefully it'll still make 550rwhp for you.
http://21stcenturymusclecars.com/21s...aft-1-1-2.aspx
http://21stcenturymusclecars.com/21s...aft-1-1-2.aspx
Last edited by PRE-Z06; 10-10-2013 at 05:27 PM.
10-11-2013, 09:59 AM
#15
High lift cams can be harder to control on boosted cars if good springs aren't used, but peak lift isn't what determines that...ramp rates and valvetrain play a big part in stability. Honestly that's a mild cam for a LS7 and more fitting for an LS3 imo as seen in the link below, hopefully it'll still make 550rwhp for you.
http://21stcenturymusclecars.com/21s...aft-1-1-2.aspx
http://21stcenturymusclecars.com/21s...aft-1-1-2.aspx
Thank you.
I did have him spec out another cam, and want to see what you guys think.
239/247 .611/.601 114+5 This paired up with WCCH ported heads