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| '''Disable spark and fuel''' | | '''Disable spark and fuel''' |
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− | Ideally, warm up the engine first. Piston and rings are designed to provide optimum sealing at operating temperature.
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| On a vehicle with a electric fuel pump pull the fuel pump relay, let engine idle until it stalls out. For mechanical fuel pump, I think using a vise grip and 2 thin blocks of wood (to avoid crimping the soft line) on the rubber fuel line will work. This prevents fire hazard. | | On a vehicle with a electric fuel pump pull the fuel pump relay, let engine idle until it stalls out. For mechanical fuel pump, I think using a vise grip and 2 thin blocks of wood (to avoid crimping the soft line) on the rubber fuel line will work. This prevents fire hazard. |
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| Move onto the next cylinder, repeat the compression test, and when you're done they should not be more than 10% off from each other, and none should be really low (0). If they are, you have some problems. | | Move onto the next cylinder, repeat the compression test, and when you're done they should not be more than 10% off from each other, and none should be really low (0). If they are, you have some problems. |
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− | ==Static compression ratio==
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− | *[http://www.wheelspin.net/calc/calc2.html SCR]
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− | ==Dynamic compression ratio==
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− | *[http://www.wallaceracing.com/dynamic-cr.php Wallace Racing DCR calculator]
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− | *[http://www.empirenet.com/pkelley2/DynamicCR.html Kelly DCR calculator]
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− | *[http://www.uempistons.com/calc.php?action=comp2 KB/Silvolite DCR calculator]
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− | *[http://www.rbracing-rsr.com/comprAdvHD.htm RSR DCR calculator]
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− | Some dynamic compression rtatio calculators (like KBs) ask for an additional 15 degrees of duration be added to the IVC @ 0.050" lift point figure. This works OK on older, slower ramped cam lobes, but the faster lobe profiles may need to have 25 degrees or more added to be accurate.
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− | If the intake valve closing (IVC) point isn't known, it can be calculated:
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− | # Divide the intake duration by 2
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− | # Add the results to the lobe separation angle (LSA)
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− | # Subtract any ground-in advance
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− | # Subtract 180
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− | This result does not need to have any amount added to the IVC point, like the KB calculator calls for.
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− | ==Resources==
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− | *'''[[Vacuum gauge engine diagnosis]]'''
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− | *'''[[Finding vacuum leaks]]'''
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− | [[Category:Engine]]
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− | [[Category:Troubleshooting]]
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