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Thread: How To: Compression Test
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12-01-2005, 09:34 PM #1
How To: Compression Test
Can someone provide a detailed "how to" compression test? For instance, are all 3 plugs supposed to be out and should the throttle be held wide open while cranking? I remember Miketrin did a nice one for me with the spark plugs last summer.
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12-01-2005, 09:45 PM #2
Devil:
Get the ski warmed up....... Take out a plug at a time, screw in the tester, zero it out, hold the throttle WFO and crank it for about 5 seconds or so.
Look at the reading. Move on to the next cylinder, lather/rinse/repeat......
cylinders should be within 5-10 psi of each other. Some people say within 10%
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12-01-2005, 09:49 PM #3
Do not waste your money on a cheap tester. I have a Snap On but I am sure that there are less expensive ones out there.
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12-01-2005, 09:51 PM #4
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05-31-2007, 03:02 PM #5
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What numbers should we be looking for when checking compression on the 4-tec SCIC engine? Like what should each cylinder's compression be?
Thanks.
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05-31-2007, 06:31 PM #6
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05-31-2007, 08:11 PM #7
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05-31-2007, 09:59 PM #8
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05-31-2007, 10:10 PM #9
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06-01-2007, 12:05 AM #10
145-155 would be normal. The key is to test on a motor after it has run and reached operating temps and has a fully charged battery.
I like to use the within 10% rule so as long as they are all within 15 psi of each other, no worries.
If they are not, then do a leakdown test to see where the leak is.
Steve
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