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Old 09-09-2009, 09:18 AM   #1
vertC6
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Default ZR1 cam specs and LSA

Has anyone figured out what the LSA is on the LS9? I found the duration and lift but no one seems to know the LSA? Also does GM sell it? Thanks
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Old 09-09-2009, 10:39 PM   #2
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Is GM keeping this a secret or does no one know?
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Old 09-10-2009, 01:39 AM   #3
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211/230 @ .050, seems to be the 427 LS7 cam but using 1.7 ratio rockers instead of 1.8
I can tell u GM did leave a little on the table as far as power goes, and the parts they would need are already in GM inventory
And who's idea was that rev-limit?
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Old 09-10-2009, 12:50 PM   #4
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I found the LSA it is 122.5
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Old 09-11-2009, 11:11 AM   #5
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I thought the LSA on the LS7 cam was 120??? Does this mean the LS9 cam isn't the same as the LS7 cam? Lift numbers I found for the LS9 were .562"/.558" so that seems pretty consistent with the difference between a 1.7 and 1.8 ratio rocker.

Cheers, Paul.
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Old 09-11-2009, 06:17 PM   #6
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Quote:
Originally Posted by MTIRC6Z View Post
I thought the LSA on the LS7 cam was 120??? Does this mean the LS9 cam isn't the same as the LS7 cam? Lift numbers I found for the LS9 were .562"/.558" so that seems pretty consistent with the difference between a 1.7 and 1.8 ratio rocker.

Cheers, Paul.
No way the LS7 cam is even close to the LS9, the LS9's cam is designed for the blower, you are comparing a high compression NA car vs a Low compression FI car, not even close.
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Old 09-14-2009, 03:05 PM   #7
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Okay, the same lift (notwithstanding rocker ratio), duration on both intake and exhaust are exactly the same, and the LSA is right around 120 on both...so, I'm curious, what exactly is "not even close"

Do you know exactly what it is about the LS9 cam that makes is SOOOO different from the LS7 cam (notwithstanding that the specs are almost identical) or are you just assuming the cams are very different because one is NA and the other FI?

Cheers, Paul.
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Old 09-15-2009, 10:25 AM   #8
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I beg to differ.....the ls7 and ls9 cams are VERY close, if not exact same. They may have widened the LS but the lift difference is from the 1.7 rockers. Does not matter to me, mine will be out of the car soon, along w/ the heads and some other useless items. 1200mi now, by 2k mi, 9sec pass
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Old 09-15-2009, 05:28 PM   #9
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In GM's system, the lobe lift (measured on the cam) on both LS7 and LS9 is .331" on the intake and .328" on the exhaust. The duration is also the same, but it does not specify the LSA. I am pretty sure since the rest of the measurements are identical, so s the LSA. As others have stated, the only difference is the 1.7 vs 1.8 rockers.
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Old 09-15-2009, 09:25 PM   #10
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Originally Posted by MTIRC6Z View Post
Okay, the same lift (notwithstanding rocker ratio), duration on both intake and exhaust are exactly the same, and the LSA is right around 120 on both...so, I'm curious, what exactly is "not even close"

Do you know exactly what it is about the LS9 cam that makes is SOOOO different from the LS7 cam (notwithstanding that the specs are almost identical) or are you just assuming the cams are very different because one is NA and the other FI?

Cheers, Paul.
Wow!! I just assumed, being that they are entirely different motors, they dont sound the same at Idle, the sweet spots in the two cars feel very different, I know that is from the FI, I guess I thought GM would have designed a more specific cam for the car.
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Old 09-15-2009, 10:13 PM   #11
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Quote:
Originally Posted by J HEBERT View Post
I beg to differ.....the ls7 and ls9 cams are VERY close, if not exact same. They may have widened the LS but the lift difference is from the 1.7 rockers. Does not matter to me, mine will be out of the car soon, along w/ the heads and some other useless items. 1200mi now, by 2k mi, 9sec pass
I'm with you. I've already replaced my cam and heads.
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Old 09-16-2009, 08:50 PM   #12
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http://forums.corvetteforum.com/c6-c...-part-1-a.html

says lsa is 122.5 degrees and that the cam is not identical to the ls7
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Old 09-16-2009, 09:37 PM   #13
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Originally Posted by 1 BAD ZR1 View Post
I'm with you. I've already replaced my cam and heads.
did I miss your post?! Details, please!
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Old 09-16-2009, 09:42 PM   #14
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Quote:
Originally Posted by redknight View Post
http://forums.corvetteforum.com/c6-c...-part-1-a.html

says lsa is 122.5 degrees and that the cam is not identical to the ls7
Then they widened the lobe separation to retain boost, it's done all the time w/ blower cams. Remember that any overlap is going to bled off cyl. pressure (and boost) at lower rpms.
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Old 09-16-2009, 10:37 PM   #15
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Originally Posted by J HEBERT View Post
Then they widened the lobe separation to retain boost, it's done all the time w/ blower cams. Remember that any overlap is going to bled off cyl. pressure (and boost) at lower rpms.
agreed, same lobes just spread them apart...what does the zr1 idle at exactly?
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Old 09-19-2009, 09:14 PM   #16
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Old 09-19-2009, 11:05 PM   #17
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Here scroll down the page: http://corvetteactioncenter.com/spec..._pursuit6.html
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Old 09-20-2009, 12:57 AM   #18
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Default LS9 Cam

The LS9 cam has a 122.5 LSA. Actually the lobe profile between the LS7 and LS9 is SIMILAR but the LS9 cam is a different animal altogether because, as noted above, it's designed for the S/C and Heat. A great article on the LS9 engine is in HOT ROD Mag July 2009. Check it out.
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Old 09-20-2009, 12:57 AM
 
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