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Y7 compression test results

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Old 10-29-2008, 11:27 AM
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Default Y7 compression test results

#1 - 125
#2 - 120
#3 - 130
#4 - 100

Ran the test because of white smoke.. possible that #4 has bad rings?
Old 10-29-2008, 11:31 AM
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most likely your head gasket is going, those are usually the symptons,

-white smoke
-loss of compression
-coolant loss
-coolant in oil/oil in coolant

if i were you i get to this and make sure its a head gasket before it hurts your motor in the long run.

also a headgasket is not very difficult to do, i'd did one myself and before i've never worked on a honda before *my first ej1* but even though you could do it yourself also, just go to the local parts store and pick up a cheap haynes manual and use that to help you.


also just checking your sig, do you have a Y7 motor in your ex coupe?
Old 10-29-2008, 11:33 AM
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Default Re: Y7 compression test results (UserX826)

#4 is about 28-30% less than your best cylinder...so your rings are probobly worn out...but thats not terrible...id think its time for a rebuild though your readings across the board are a little low....plus your white smoke is probobly a headgasket....
Old 10-29-2008, 11:35 AM
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Default Re: Y7 compression test results (90Rexx)

just to clarify, only reason you should re-ring is cuz ur heads gonna be off for the headgasket anyways....

in other news....i have a full gsr swap if your interested....100k miles on it fresh timing belt + tensioner...bone stock. comes with everything u need for the swap.
Old 10-29-2008, 11:41 AM
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Well that's the thing.. This is a fresh rebuild. the Y8 broke a rod in half and put a hole in the block. So i rebuilt a Y7 block, kept the Y8 head on.

New headgasket, new rings.. but it's more likely for the rings to be bad than the headgasket i think b/c the cylinders had a little residue in them.. got rained on after i had the block honed.. got a hone from autozone and went through the cylinders myself

Also, changed my sig. I'm broke!
Old 10-29-2008, 11:44 AM
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check your timing
Old 10-29-2008, 11:49 AM
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timing is gonna cause white smoke?
Old 10-29-2008, 11:50 AM
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well idk but seeing how your comp is low across the board your timing would be a good suspect being this a rebuilt engine you sure it isnt just gray smoke fom unburned fuel
Old 10-29-2008, 11:53 AM
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yeah. it's white from the VC vent
Old 10-29-2008, 11:58 AM
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you got all your little coolant lines hooked up right i saw a 96 ex with a d15b that had a coolant line running into the crankcase it was a mess. did you replace your intake gasket
Old 10-29-2008, 12:00 PM
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lol. wow. yeah it's all hooked up right. didn't replace the intake gasket.. never took the intake off of the head during the swap
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