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Old 12-12-2009, 04:01 PM   #15
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CTS-V engine, LSA, exploded view

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Old 12-12-2009, 06:44 PM   #16
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really great info man, what about the cam shafts, does the ZR1 and the CTS-V use the same cam?
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Old 12-12-2009, 09:31 PM   #17
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LS9 (ZR1) Cam: 211/230, 0.562/0.558, 122.5 deg
LSA (CTS-V) Cam: 198/216, 0.480/0.480, 119 deg

Biggest differences between LS9 and LSA, other than cam, is 2.3L SC running at 10.5 psi on LS9 and 1.9L SC running at 9 psi on LSA. Both have 9.1:1 compression, both run heads based on L92 design (LS9 could flow slightly better or maybe cool better - anybody have info on heads?). Both have forged cranks but LS9 has Titanium rods and forged pistons while LSA has powdered rods and cast pistons (like LS3, though LS3 has cast crank too).
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Old 12-15-2009, 12:02 AM   #18
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Quote:
Originally Posted by barrylnv View Post
LS9 (ZR1) Cam: 211/230, 0.562/0.558, 122.5 deg
LSA (CTS-V) Cam: 198/216, 0.480/0.480, 119 deg

Biggest differences between LS9 and LSA, other than cam, is 2.3L SC running at 10.5 psi on LS9 and 1.9L SC running at 9 psi on LSA. Both have 9.1:1 compression, both run heads based on L92 design (LS9 could flow slightly better or maybe cool better - anybody have info on heads?). Both have forged cranks but LS9 has Titanium rods and forged pistons while LSA has powdered rods and cast pistons (like LS3, though LS3 has cast crank too).
LSA doesnt have forged piston and rods? That would almost make it an low compression ls3. Wait I thought the crank was forged on the ls3?
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Old 12-15-2009, 09:47 AM   #19
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Quote:
Originally Posted by barrylnv View Post
LS9 (ZR1) Cam: 211/230, 0.562/0.558, 122.5 deg
LSA (CTS-V) Cam: 198/216, 0.480/0.480, 119 deg

Biggest differences between LS9 and LSA, other than cam, is 2.3L SC running at 10.5 psi on LS9 and 1.9L SC running at 9 psi on LSA. Both have 9.1:1 compression, both run heads based on L92 design (LS9 could flow slightly better or maybe cool better - anybody have info on heads?). Both have forged cranks but LS9 has Titanium rods and forged pistons while LSA has powdered rods and cast pistons (like LS3, though LS3 has cast crank too).
The heads are the same. The heads have special flow vanes and are heat-treated to a higher spec' than regular Gen IV heads; they are the same between the two engines though. No other Gen III or Gen IV engines have forged cranks - they're nodular iron and I believe they have rolled fillets. LSA pistons are a hypereutectic, which is a form of a forging, if I'm not mistaken, but have other compounds in it so it doesn't make as much noise as a true forged piston.

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LSA doesnt have forged piston and rods? That would almost make it an low compression ls3. Wait I thought the crank was forged on the ls3?
Nodular iron
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Old 12-15-2009, 09:48 AM   #20
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Oh - also, the main caps on the LS9 have are doweled, and forged, if I'm not mistaken, while LSA is not; same block, but some subtle differences.
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Old 12-15-2009, 01:41 PM   #21
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Originally Posted by barrylnv View Post
LS9 (ZR1) Cam: 211/230, 0.562/0.558, 122.5 deg
LSA (CTS-V) Cam: 198/216, 0.480/0.480, 119 deg

Biggest differences between LS9 and LSA, other than cam, is 2.3L SC running at 10.5 psi on LS9 and 1.9L SC running at 9 psi on LSA. Both have 9.1:1 compression, both run heads based on L92 design (LS9 could flow slightly better or maybe cool better - anybody have info on heads?). Both have forged cranks but LS9 has Titanium rods and forged pistons while LSA has powdered rods and cast pistons (like LS3, though LS3 has cast crank too).
LSA:
A356-T6 rotocast cast aluminum

LS9:
Cast aluminum

http://archives.media.gm.com/us/powe...a/10car_us.htm
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Old 12-15-2009, 01:44 PM   #22
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boy MODS, you certianly turned this thread topic around.

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Old 12-16-2009, 11:43 AM   #23
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Love all the info in this thread ..

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Old 12-17-2009, 10:03 AM   #24
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WTF?! I thought both blocks were the same aluminum... I guess not!
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Old 12-17-2009, 10:28 AM   #25
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LOL thanks for that I was searching and thought I was going crazy..

you coulda asked....
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Old 12-17-2009, 12:13 PM   #26
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ZR1 engine, LS9, exploded view




All I know for sure is that this is a VERY cool pic!


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