| shock 'target gas force' explained |
- A calculated gas force is recorded on the Sh Dyno tab because the actual dyno Gas Force numbers fluctuate from excessive seal drag. We noticed back in 2006 that the gas force tests were not consistent.
For example (3342):
- We calculate what the gas force should be based on oil and gas volume.
- See excel file in my docs / reStackor_info_from_calvin / ressy_press /
- For example:
- 16sxf250-psh = 69c
- 12sxf450-psh = 73c
- Dynamic gas force is 4 lbs higher than calculated, probably due to 'heat gain effect'.
- When a gas is rapidly compressed the temperature will increase resulting in a temporary spike in pressure. This dissipates immediately on return stroke.
- Therefore, target gas force is always 4 lbs higher than the above calculated.
(gas force fudge number = 4)
- 16sxf250-psh = 69c + 4 = 73 [target]
- 12sxf450-psh = 73c + 4 = 77 [target]
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| GAS FORCE AND TARGET NUMBERS |
- The two primary compression target numbers are created from c-zeta and ca-zeta.
- Gas force is not used when creating primary target numbers.
- The 'gas force fudge number'* and drag force are added to c-zeta & ca-zeta target numbers to get co wogas target. *[sh target drag force explained]
For example (3342) at 1ips:
- (cforce + caforce + gas fudge + source drag force at 1ips) = co wogas target
- 28 + 1 + 4 + 19 = 52
- Target gas force is displayed on the page simply to show what ideal gas force should be.
- Actual gas force may vary slighlty, but pressure tests are carefully regulated and the actual and target gas force numbers should be within +/- 1psi.
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