Stock Compression Ratio's

[Mikie12]

For a comparision, does anyone know the stock compression ratio's for our 5. 9's from 2003 thru the 2007 6. 7's???

It would be interesting to see if the ratios were lowered to accommodate the eco frauds.

 

[Vaughn MacKenzie]

Here's some I've found:



12 valves 17. 5:1

24v (ETC) 16. 3:1

24v HO 17. 1:1

HPCR 17. 2:1

HPCR "600" series 17. 2:1

6. 7L 17. 2:1 (another source says 17. 3:1)









I think the early HPCR Cummins were 17. 2:1 but not sure if that was just the HO or all of them.