August 2, 200917 yr comment_363011 hey just did a compressioin test on my 4k and got 160psi on all cylinders was just wondering what the compression is meant to be? my 4k is meant to have higher compression so seems abit low to me cheers andrew Report
August 2, 200917 yr comment_363015 If it has a big cam with a lot of overlap that should be expected. Read up a bit on dynamic/effective compression. Report
August 2, 200917 yr Author comment_363093 ok yea got a abit of a big cam in if cheers will read up about it Report
August 26, 200917 yr comment_368852 Those numbers sound reasonable. The problem is usually seen when one cylinder is different to the rest. The relationship between cylinder pressure and compression ratio is complex and cylinder pressure won't tell you the comp ratio. Report
August 26, 200917 yr comment_369041 160 sounds rite (my cylinder 4 got 140psi :P, no smoke but ) Report
August 26, 200917 yr comment_369067 Those numbers sound reasonable. The problem is usually seen when one cylinder is different to the rest. The relationship between cylinder pressure and compression ratio is complex and cylinder pressure won't tell you the comp ratio. anything over 10% will cause a noticeable misfire. Report
August 26, 200917 yr comment_369097 anything over 10% will cause a noticeable misfire. Not necessarily. It will cause the motor to be down on power and run rougher due to cylinder imbalance. Evan I'd be doing a wet/dry compression test to determine if it is the rings or valves/headgasket. It is common for cylinder 4 to go first if the motor has been run without a thermostat for any length of time. Report
August 27, 200917 yr comment_369130 Not necessarily. It will cause the motor to be down on power and run rougher due to cylinder imbalance. ^noticeable misfire Report
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