Yes ya HAVE to use the advertised numbers.The valves are not closed to build compression @50. With the advertised numbers there may be a few more degrees before the I valve closes as differant cam Co's check at different places. That means it will be less than what the numbers say,by a little.

The DCR is what the engine actually sees after the valves are closed. The valve events determine how much/little is bled off from the static.
Static does not tell ya what the engine is running on.
Those engine builders ya talked to can believe whatever they want.

 

Is it in the 270* advertised range?
Are ya trying to run on pump gas?

 

This is all the spec card says on it for the IVC ABDC #'s
Valve timing close @ .006 = 63*

That help, I'm not sure what to think at the moment?

 

9.6 is way high to try to run on 92 octane unless ya pull a lot of timing and then it runs like crap.
A larger cam will fix it up,but not too large.
Is the cam ya got about 270* advertised on the intake?

 

it looks to be @ .006 is 268
I haven't had any problems filling up and running on 91 octane, I thought that with what was calculated as dcr I was in trouble with the timing but it's running good, compression check on the motor gave me 180 psi if that helps

 

the 180 psi was on a 72 degree day with the car not ran at all that day

 

A 9.6 should give ya about 250+ cranking compression according to my program.
Something strange going on here.

 

what are you using? Comp's cam selection software? or is it web based?

 

It is a purchased program from Performance Trends. I have several programs for engine design.
No desktop dyno either.

 

That is rather low compression for a motor with that much dcr. I would investigate the head gaskets. FYI with a dcr that high you should be getting a good deal of knock unless you have a great cooling setup. The fact that you are getting no knock seems very strange indeed.

 

I also figured it up using Engine Analyzer Pro. Great program btw. I would not ever use desktop dyno if I could help it - very inaccurate in my experience with it.

 

so a static 9.5 to 1 motor wouldn't push out 180 psi cold, last time I checked a static 9.5 to 1 was around 170-190 PSI. As timing advances it allows the valve to close sooner at the upper RPM? The way I have understood it as you add more timing your ABDC event will happen sooner changing how much air you have in the cylinder at upper rpm along with changing the compression ratio and making it increase with the ABDC happening sooner then at low idle. Is this not how it happens?

 

NO NO NO
The valve timing in an LT1/SBC never moves.
The computer controls the spark timing.

 

OK, thanks I didn't understand 1racerdude.
But isn't a static compression ratio of 9.5:1 about what I listed at 170 - 190 psi? If my dynamic is figured down to 9.5:1 I should see this shouldn't I?

 

170-190 is more than 9.5 static,I think.

Didn't understand the other question.