reading spark plugs?
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Honda-Tech Member
Joined: Jun 2005
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From: Long Island, NY
reading spark plugs?
I have a 2008 Civic Si k20z3, 11:1 is stock compression
well just got done with the compression test again with a brand new gauge. the readings were 150, 160, 155, 160. i was at WOT and cranked the engine about 12 revolutions. when i didnt hold WOT, i got the same results which was weird. I looked down the cylinder with a flashlight and cant really tell much. all i can see is burnt spots on top of the piston. kind of looks like cow spots.
Does this seem normal for a motor with 11:1 compression? guys on the 8th gen forums say they were up at the 180-190 mark. i know some gauges read different then others, but that much off? where would i be able to get the OFFICIAL honda specs?
here are pics of all 4 spark plugs. they are not TOTALLY covered in this stuff. but very lightly dusted...
cylinder 1 (drivers side)
cylinder 2
cylinder 3
cylinder 4
well just got done with the compression test again with a brand new gauge. the readings were 150, 160, 155, 160. i was at WOT and cranked the engine about 12 revolutions. when i didnt hold WOT, i got the same results which was weird. I looked down the cylinder with a flashlight and cant really tell much. all i can see is burnt spots on top of the piston. kind of looks like cow spots.
Does this seem normal for a motor with 11:1 compression? guys on the 8th gen forums say they were up at the 180-190 mark. i know some gauges read different then others, but that much off? where would i be able to get the OFFICIAL honda specs?
here are pics of all 4 spark plugs. they are not TOTALLY covered in this stuff. but very lightly dusted...
cylinder 1 (drivers side)
cylinder 2
cylinder 3
cylinder 4
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