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.

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

Originally Posted by ddnspider

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.

Originally Posted by ddnspider

Put it on a spintron if youre that vested in the LS6 spec's.

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.

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?

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.

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.

Originally Posted by G Atsma

^^^^^^^^THIS^^^^^^^. You're not breaking new ground here.....

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.

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.

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.

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.

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.

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.

Originally Posted by Che70velle

To find the dynamic compression numbers, ALWAYS use the .006 numbers