Posted August 26, 201014 yr comment_329084 just checked my 240's compression and found:11575755050115the first three plugs were black and sooty...the other three were almost new looking...becasue they are...(maybe an hour on the new plugs)what are options? Leakdown test first?buy another motor? rebuild mine?Sea Foam? check valves/adjust? timing chain?thanks Edited August 26, 201014 yr by bounce Link to comment https://www.classiczcars.com/forums/topic/36896-compression-baaad-now-what/ Share on other sites More sharing options...
August 26, 201014 yr comment_329085 First, describe how you conducted the test.... If done incorrectly, you will get real erroneous readings... Link to comment https://www.classiczcars.com/forums/topic/36896-compression-baaad-now-what/#findComment-329085 Share on other sites More sharing options...
August 26, 201014 yr comment_329086 Those numbers look unusually low. Was the engine working at all? I ask because I do not believe those values would support combustion. Do you perform the test at WOT? Is the compression check gauge in proper working order? Link to comment https://www.classiczcars.com/forums/topic/36896-compression-baaad-now-what/#findComment-329086 Share on other sites More sharing options...
August 26, 201014 yr Author comment_329088 ahh OK...I borrowed a comp tester from my mechanic...he said to watch the needle twitch 5 times to get the number....got home, pulled plug #1 (closest to radiator), screwed in air hose to plug hole going about 50-60 % of hand tight....attached comp gauge to the hose fitting..... turned engine over watching the compression gauge needle tick 5 times....I let it go a couple more times as well on #1 and it almost reached 125psireplaced plug#1removed plug #2 (second away from radiator)....screwed in air hose...hand tight....attatched gauge....turned engine over watcing five ticks on the needle occur...yes the engine runs right now. Edited August 26, 201014 yr by bounce Link to comment https://www.classiczcars.com/forums/topic/36896-compression-baaad-now-what/#findComment-329088 Share on other sites More sharing options...
August 26, 201014 yr comment_329089 Nope. You did it wrong... that's why your numbers are so screwy...Warm engine to normal operating temp.Remove all spark plugs.Wedge throttle to wide open.Conduct your compression test, preferably with a screw-in type of tester.Your numbers should now be accurate. Link to comment https://www.classiczcars.com/forums/topic/36896-compression-baaad-now-what/#findComment-329089 Share on other sites More sharing options...
August 26, 201014 yr Author comment_329090 WTO ...had to look that up..... it's the same as WFO thanks for the quick responses....I owe ya'll beers when you pass through AZ... yeah...engine was cold....pulled one plug at a time.....and no throttle setting so...with the first three plugs being completely black and sooty...and the last three being in new condition after one hour of driving on new plugs....is that a carb setting? Edited August 26, 201014 yr by bounce Link to comment https://www.classiczcars.com/forums/topic/36896-compression-baaad-now-what/#findComment-329090 Share on other sites More sharing options...
August 26, 201014 yr comment_329091 Potentially. Your front carb could be overly rich (and likely is, based on what you described). Have a conversation with Bruce Palmer about that.Go re-run your compression test and let us know the revised numbers. I think you'll be surprised! Link to comment https://www.classiczcars.com/forums/topic/36896-compression-baaad-now-what/#findComment-329091 Share on other sites More sharing options...
August 26, 201014 yr comment_329092 could be. replace all plugs to new condition and check regularly.and WOT = wide open throttle. important while doing compression test. Link to comment https://www.classiczcars.com/forums/topic/36896-compression-baaad-now-what/#findComment-329092 Share on other sites More sharing options...
August 26, 201014 yr Author comment_329095 heh, I gave Bruce my credit card info earlier this moring for shiny carbs. yes, reborrowed the threaded comp tester.... will check them out later this afternoon.. Edited August 26, 201014 yr by bounce Link to comment https://www.classiczcars.com/forums/topic/36896-compression-baaad-now-what/#findComment-329095 Share on other sites More sharing options...
August 26, 201014 yr Author comment_329096 could be. replace all plugs to new condition and check regularly.and WOT = wide open throttle. important while doing compression test. and WFO? wide &^%&% open Link to comment https://www.classiczcars.com/forums/topic/36896-compression-baaad-now-what/#findComment-329096 Share on other sites More sharing options...
August 26, 201014 yr comment_329097 aha nice. let us know how the compression goes. Link to comment https://www.classiczcars.com/forums/topic/36896-compression-baaad-now-what/#findComment-329097 Share on other sites More sharing options...
August 26, 201014 yr Author comment_329101 so after the intial compression test...should I add oil to the cylinder to see if compression goes up to isolate weak rings if compression is below a certain number? and how much oil should be squirted in a cylinder? Link to comment https://www.classiczcars.com/forums/topic/36896-compression-baaad-now-what/#findComment-329101 Share on other sites More sharing options...
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