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Old Jun 18, 2023 | 08:25 PM
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Originally Posted by Patrick G
Exact specs:

02+ Z06 camshaft 0.006 0.050 0.200

Intake Duration - ID 270 204 125 02 LS6 intake
Exhaust Duration - ED 277 218 135 02 LS6 exhaust
Lobe Center Angle - LSA 117.5 117.5 117.5
Intake Centerline - ICL 120 120 120

Intake Valve opens - IVO 15 -18 -57.5 BTDC
Intake Valve closes - IVC 75 42 2.5 ABDC
Exhaust Valve Opens - EVO 73.5 44 2.5 BBDC
Exhaust Valve Closes - EVC 23.5 -6 -47.5 ATDC
Exhaust Centerline - ECL 115 115 115
Overlap 38.5 -24 -105 degrees

Notice that the cam is retarded -2.5 degrees. The ICL is actually 120. This is one of the big reasons why the '02+ LS6 cam will rev so well with such small intake duration. An intake valve closing point of 42 degrees works very well.
Can you tell me what the actual timing events are please.
Not the @50 @60 or @200.
As I don't know how to convert them over to actual timing events.
Thanks Dave
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Old Jun 19, 2023 | 06:10 AM
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Originally Posted by Shtstr
Can you tell me what the actual timing events are please.
Not the @50 @60 or @200.
As I don't know how to convert them over to actual timing events.
Thanks Dave
https://www.summitracing.com/newsand...ing-calculator
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Old Jun 19, 2023 | 06:46 AM
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Originally Posted by ddnspider
that calculator will only give you @50 lift valve events not the actual valve events.

It says inlet valve closing at 39 degrees ABDC.
That's the @50 lift but could be as much as 90 degrees actually abdc depending on the ramp rate of the factory cam.
Obviously it's a massive difference to dynamic compression ratio.
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Old Jun 19, 2023 | 08:12 AM
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The advertised durations were right there in your quote in post 21 (270/277). Plug it in along withe the LSA and Intake centerline into Summit's program and you'll get the events.
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Old Jun 19, 2023 | 09:05 AM
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Originally Posted by Shtstr
that calculator will only give you @50 lift valve events not the actual valve events.

It says inlet valve closing at 39 degrees ABDC.
That's the @50 lift but could be as much as 90 degrees actually abdc depending on the ramp rate of the factory cam.
Obviously it's a massive difference to dynamic compression ratio.
Put it on a spintron if youre that vested in the LS6 spec's.
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Old Jun 19, 2023 | 06:24 PM
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Originally Posted by ddnspider
Put it on a spintron if youre that vested in the LS6 spec's.
Just to clarify I don't want use the ls6 cam.

I'm only after the exact specifications so I can find the factory dynamic compression ratio.

Using the calculator and 10.5 to 1 static compression ratio.
You get 9.73 to 1 dynamic compression.
We all know that isn't possible for pump fuel.

So using this method the cam I'm looking at has 42.5 degrees closing point @50.
With my higher static compression ratio of 11.67 to 1 I will end up with a dynamic compression ratio of 10.63 to 1.
this is why I need the exact numbers to work it out.
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Old Jun 19, 2023 | 06:51 PM
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Originally Posted by Shtstr
Just to clarify I don't want use the ls6 cam.

I'm only after the exact specifications so I can find the factory dynamic compression ratio.

Using the calculator and 10.5 to 1 static compression ratio.
You get 9.73 to 1 dynamic compression.
We all know that isn't possible for pump fuel.

So using this method the cam I'm looking at has 42.5 degrees closing point @50.
With my higher static compression ratio of 11.67 to 1 I will end up with a dynamic compression ratio of 10.63 to 1.
this is why I need the exact numbers to work it out.
what is possible with pump fuel would depend on the AFR and timing. Why are you trying to reinvent the wheel for compression ratio, some type of class limit?
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Old Jun 20, 2023 | 12:18 AM
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Originally Posted by ddnspider
what is possible with pump fuel would depend on the AFR and timing. Why are you trying to reinvent the wheel for compression ratio, some type of class limit?
No I'm building a ls1 5.7 and want to up the compression ratio to improve hp and torque.
car is a street car in Australia so fuel choice is limited to usa 89 to 93 octane. Australia octane equivalent is 91 to 98.
so dynamic compression ratio can't be above 9.3 or 200psi from what I'm lead to believe.
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Old Jun 20, 2023 | 06:14 AM
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Originally Posted by Shtstr
No I'm building a ls1 5.7 and want to up the compression ratio to improve hp and torque.
car is a street car in Australia so fuel choice is limited to usa 89 to 93 octane. Australia octane equivalent is 91 to 98.
so dynamic compression ratio can't be above 9.3 or 200psi from what I'm lead to believe.
There's been plenty of high compression pump gas builds in here over the years. You dont need to guess. Guys like @Darth_V8r and @Chev70elle should be able to steer you in the right direction.
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Old Jun 20, 2023 | 11:15 AM
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Originally Posted by ddnspider
There's been plenty of high compression pump gas builds in here over the years. You dont need to guess. Guys like @Darth_V8r and @Chev70elle should be able to steer you in the right direction.
^^^^^^^^THIS^^^^^^^. You're not breaking new ground here.....
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Old Jun 20, 2023 | 12:58 PM
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Originally Posted by G Atsma
^^^^^^^^THIS^^^^^^^. You're not breaking new ground here.....
Too funny 😂
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Old Jun 20, 2023 | 02:13 PM
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Originally Posted by Shtstr
No I'm building a ls1 5.7 and want to up the compression ratio to improve hp and torque.
car is a street car in Australia so fuel choice is limited to usa 89 to 93 octane. Australia octane equivalent is 91 to 98.
so dynamic compression ratio can't be above 9.3 or 200psi from what I'm lead to believe.
Post up a picture of your cam card from the camshaft that your planning on using.
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Old Jun 20, 2023 | 02:38 PM
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Originally Posted by Shtstr
No I'm building a ls1 5.7 and want to up the compression ratio to improve hp and torque.
car is a street car in Australia so fuel choice is limited to usa 89 to 93 octane. Australia octane equivalent is 91 to 98.
so dynamic compression ratio can't be above 9.3 or 200psi from what I'm lead to believe.
if you want to bring the compression up do a set of 862 heads with over sized valves. They flow wry well. You will have zero problems with clearance with a stock Z cam even if you do a .040 gasket. That should comfortably put you at 11:2 compression and if you’re running that jungle juice you guys have down there of 98 octane there should be absolutely 0 issues with detonation and knock.
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Old Jun 20, 2023 | 05:13 PM
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Originally Posted by ddnspider
There's been plenty of high compression pump gas builds in here over the years. You dont need to guess. Guys like @Darth_V8r and @Chev70elle should be able to steer you in the right direction.
They have all used bigger cams than I want to run.
Unfortunately the ecu setup for my combination is very different to the USA ones.
So I'm restricted with cam size on overlap.
This means my dynamic compression ratio is 9.01 or 190psi on calculations.
so I'm trying to work out what the factory ran to have a base line to work from.
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Old Jun 20, 2023 | 06:21 PM
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Originally Posted by Shtstr
They have all used bigger cams than I want to run.
Unfortunately the ecu setup for my combination is very different to the USA ones.
So I'm restricted with cam size on overlap.
This means my dynamic compression ratio is 9.01 or 190psi on calculations.
so I'm trying to work out what the factory ran to have a base line to work from.
the cryptic and half info crap is getting old fast. Just give the entire rundown on the car. I guarantee you my Titan 2 would outrun an LS6 cam by a large margin and still has very low overlap and drives beautifully.
Last edited by ddnspider; Jun 21, 2023 at 06:06 AM.
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Old Jun 20, 2023 | 10:59 PM
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Originally Posted by ddnspider
the crypical and half info crap is getting old fast. Just give the entire rundown on the car. I guarantee you my Titan 2 would outrun an LS6 cam by a large margin and still has very low overlap and drives beautifully.
I'm not using the ls6 cam.

The cam I'm looking at is a comp 54 458 11.
227 235 113lsa.
Fair bit bigger than a ls6 cam.
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Old Jun 20, 2023 | 11:00 PM
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Originally Posted by Shtstr
They have all used bigger cams than I want to run.
Unfortunately the ecu setup for my combination is very different to the USA ones.
So I'm restricted with cam size on overlap.
This means my dynamic compression ratio is 9.01 or 190psi on calculations.
so I'm trying to work out what the factory ran to have a base line to work from.
What ecu are you using that wouldn’t allow you to make tuning adjustments?
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Old Jun 20, 2023 | 11:17 PM
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Summit Ghost Cam. You'll be scary fast.
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Old Jun 20, 2023 | 11:34 PM
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And for what it’s worth here, your using your .050” number for the ABDC a number, and you have to use the .006” number for that lobe. You can find the .006 number in the Comp lobe catalog. This will dramatically lower the dynamic number on the calculator. You’ll be fine here on pump gas.
To find the dynamic compression numbers, ALWAYS use the .006 numbers
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Old Jun 21, 2023 | 01:31 AM
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Originally Posted by Che70velle
To find the dynamic compression numbers, ALWAYS use the .006 numbers
Sometimes easier said than done. You can't always find them.
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