Quote Originally Posted by BlueHatch
i know somebody on here can explain what leakdown is and what are the usual supects for causing it. i just got a comp test on my motor and i have excellent compression but 16% leakdown. can someone help me understand what this is? thx in advance
leak down usually refers tothe valve seal. when you do a compression test your usually testing the piston rings and their seal against the cylinder wall... but then again a leakdown can also show a leak around the rings if the valves are good. but all in all leakdown tests topend. compression test is for rings.