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Compression numbers ?
I took some numbers today with a known good tester. My engine was rebuilt as some of you have seen my story in the past. Running good just wanted to know what you thought of these #'s
Cold with all plugs out. 1,103 3, 100 5, 100 2, 115 4, 115 6, 112-115 Hot with all plugs out. 1, 97-99 3, 97-99 5, 97-99 2, 105 4, 105 6, 105 They seem to be within the limits even though they all are a little low, from what I have read they should be more around 120, wondering if this is because of the rebuild ?
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Tight Lines !! 
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#2
05-29-2012, 01:39 PM
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What would concern me is the drop of 10 PSI when hot on the 3. That sounds to me like to much ring end gap. They don't look that bad as it looks like they are even on each bank. It looks like it was decked on one side. Not to sure what to expect out of that 60 degree looper. I wonder what tsubaki gets out of his as he has a simliar engine?
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR 2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD  AND THE PINK JEEP!!!! R.I.P. http://www.wellcraftv20.com/communit...ad.php?t=11664 
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#3
05-29-2012, 01:40 PM
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You DID do this test at WOT didn't you?
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#5
05-29-2012, 01:57 PM
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try again with a warm engine at wot... I'd bet dollars to doughnuts that you like the numbers better
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#6
05-29-2012, 02:24 PM
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I don't remember testing mine so I'm no help.
From what I remember wide open throttle is the only correct way to get a reliable reading. Remember my Father telling me he picked up an engine for parts. The guy he bought it from said it ran like crap and had low compression, basically burned up. A good while later Daddy cleaned the carbs, done a compression test and it ran as good as any he had ever owned. He later ran across the guy he got the motor from and questioned him on the low compression. The guy did the test in the idle position. Is it possible the side with the lower compression might be head gasket related or the like?
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 '75 Cuddy with '00 Johnson Ocean Pro 150 horse Benny
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#8
05-29-2012, 02:31 PM
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Just bury the shifter forward, that would be putting it in gear, is this OK. My shifter is not the kind you can pull out and rev in nuetral. I can't rev my engine in nuetral, only a little with the fast idle lever.
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Tight Lines !!
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#9
05-29-2012, 02:34 PM
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Yes or while you are at the rear of the engine, you can just open all the butterflies to do the same thing.
I assume you are jumping the starter solenoid to do the test. As the starter won't engage with the shifter in forward by using the key.
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'75 Cuddy with '00 Johnson Ocean Pro 150 horse Benny Last edited by tsubaki; 05-29-2012 at 02:42 PM.
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