help with dynamic compression ratio

[Markus]

Hello guys,
i need help to calculate my (real) dcr. I hope you
specialists can help me.
Ok, we start with the engine facts:
bore: 4.03
stroke: 3.25
rod: 5.4
head cc: 61
piston: flat top 4cc reliefs
gasket: 4.1 bore, 0.039 c. thickness
piston: 0.02 above deck
cam: intake advertised duration: 274 (0.006 lift)
exhaust adv. duration: 278 (0.006 lift)
lobe sep. : 112
intake centerline: 110
Do you need another parameters?
I calculate a dynamic stroke length of 2.6789 and a dcr of 6.8593.
I´m right? The scr is about 10.5 to 1. Is a dcr of 6.8593 to less? If it is true.

thank´s for input guys!!

Markus

 

[fastranger347]

yes if you meen static compression ratio ,that is right, your dynamic will depend on the LCA and the blow down time among other things ground into the cam and the rpm range that it is operated in

 

[mstngjoe]

This is one of the most accurate calculators I've tried:

http://www.diamondracing.net/cocalc.htm

 

[Markus]

thank´s for input,
i calculate it with a calculator i found in the internet.
Please look at the link. Here is a pdf file with my
computation.
What do you mean?

thank you

http://212.227.100.192/mustang/dcr.pdf