I have been thinking of doing an engine swap for my well worn beast ('75 245 with 218,000 hard miles). Awhile back I checked comprsssion (without oil added) on the cuurent engine and found all cylinders 105 to 125 PSI.
Today I checked the comprssion on another engine that I own. This engine has sat unstarted for about 4-5 years. It turned over easy using the starter. With all plugs removed, I checked compression after 3 compression cycles without adding oil to the cylinders. Two cylinders checked 120 to 140 PSI, one read 90 PSI and one 60 PSI. After adding oil to each cylinder I retested. First two cylinder stayed about the same. Number 3 pumped to 110 PSI and number four pumped to 90 PSI.
My read on this is number 3 cylinder may have a burned valve and number 4 cylinder has bad or stuck rings and may also have bad valves. What is the impact of 4 to 5 years of no use? Will compression improve as this engine runs again? Do I have an engine worth swapping without repairs or can this engine be repaired? I have tools and facilities to do a full rebuild but what are the cost of parts likely to total?
What do you think??
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Beastdriver - '75 245 217K miles (Beast), '83 245 216K miles (Beauty),'87 244 DL 160K miles (Dodo)