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Thread: Engine compression
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04-19-2014, 10:33 AM #1
Engine compression
Just wondering what the std compression should be like
It's a 2004 5.7 indmar 5.7 is this ok
1-175, 2,3-180 4,5-190 and the last 3 are at 200
Just wondering if this is normal or something to be concerned about the boat only hAs 150 hrs
From mooseknuckle sledding lodge
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04-19-2014, 12:43 PM #2
Did you check the comp with all the plugs removed so the engine cranks freely ?
2012 Mobius LSV
05 Outback LS SOLD
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04-19-2014, 12:44 PM #3
Engine compression
I had z dealer do it
From mooseknuckle sledding lodge
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04-19-2014, 01:24 PM #4
You need more info to know if its good or not.
You need to know what the compression ratio for the engine is.
It could be 9.0-1, 10.0 to 1, or any number. Knowing that you will be able to see if 175-200 is a good number.
Generally you want them all to be with in 10% of each other.
Just looking at your numbers cylinder 1 is 175 and 8 is 200. That's 11% difference between all cylinders.
Just going by that I would say your engine is in good health and wouldn't worry about it.Malo <--- Means--Evil or Mean One. This explains a lot.
2013 Mojo 2.5 Skylon Tower. Bestia < Beast >
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04-19-2014, 01:41 PM #5
Engine compression
Thanks
From mooseknuckle sledding lodge
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04-20-2014, 08:39 PM #6
The number doesn't mean much as all compression gauges read different numbers according to the brand.The difference in cylinders is the important part. #1 cylinder is a hair low but as mmandely said I wouldn,t worry about it.
jy