JeePeter Posted September 14, 2020 Share Posted September 14, 2020 I inherited an incomplete build with my new Comanche and jumped the starter to perform a compression test to assess the health of the motor before investing additional time and money. Please help me to evaluate the test results below and thanks in advance. Compression test results - Cylinders 1 & 2 gradually pumped up to 90/95 after ~20 strokes - Cylinders 3 - 5 jumped right up to 145/150 - Returned to Cylinders 1 & 2 when they jumped right up to 120/125 What else you need to know - Motor donated from 1994 ZJ with a reported 130k miles - Motor has not ran in at least several months - Intake and exhaust manifolds are removed and the respective ports were open to atmosphere during the test - Engine oil is toward the low end of the safe operating range and there is no evidence of coolant in the crankcase Link to comment Share on other sites More sharing options...
Pete M Posted September 14, 2020 Share Posted September 14, 2020 was the test done wet or dry? what about #6? Link to comment Share on other sites More sharing options...
JeePeter Posted September 14, 2020 Author Share Posted September 14, 2020 Dry. #6 pumped right up to 145. Link to comment Share on other sites More sharing options...
jdog Posted September 14, 2020 Share Posted September 14, 2020 Sounds good for a motor that's been sitting, bet if you squirt a drop of oil in them the numbers will jump up and even out Link to comment Share on other sites More sharing options...
JeePeter Posted September 15, 2020 Author Share Posted September 15, 2020 Thank you, gentlemen! Link to comment Share on other sites More sharing options...
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