Mike Cordero

iTrader: (122)

I have a 6.0L iron block, bored to .030 with a 4" crankshaft and 6.125 rods, the pistons is a -29 cc one (JE). My questions is: what's the CR if I use the mentioned combination with a 243's head with 64cc chamber and if I use a 317's with 72cc chambers? I'm planning to go twin turbo. Also can use a standard stroke crank with the 6.125 rods and flat pistons (Diamobs-3cc's); by using the same heads, what would be the CR and which combination would be better for the TT combo?

Aaron at SDPC

With the 243s the compression will be roughly 9.1:1 with a standard gasket. If you were to put the combination together with the 317s that would put you around 8.5:1.

KCS

iTrader: (20)

Try this:
Compression Ratio Calculator

Mike Cordero

iTrader: (122)

I'm only looking for an estimate. I don't know about numbers, just what I wrote at the beginning of the post; no idea of gaskets gross/thickness or other number to calculate. Can you do some numbers??? with the -29cc JEpistons or if I go with the -3cc Diamonds?

Mike Cordero

iTrader: (122)

Think that these numbers are with the -29cc's, what if I ise the -3cc's with the two heads options?

Aaron at SDPC

With a -3cc piston you would be looking at a compression of approx. 11.7:1 with the 243s and approx. 10.7:1 with the 317s.

Kele McCarley

KCS

iTrader: (20)

Try this:
Compression Ratio Calculator

MuhThugga

I know this is from 2016, but this is my new favorite post.

"Hai guyz. Wuts mah compression?!?"

"Here's a tool that will allow you to plug in the numbers and figure it out."

"I dunt have all teh numberz to do it mahself! But hey, can u use mah incomplete numberz and do it for meh?"

pantera_efi

iTrader: (1)

Hi Kele, I use EAP for compression Ratio Calcs.

I do this for ALL LS-1 Tech members who ask.

PROVIDE your specs, you will get an answer ?

Lance

G Atsma

Sounds like some of us..... lol

KCS

iTrader: (20)

You can lead a horse to water...