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compression is low in #1 cylinder, should i get a new motor

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Old 04-11-2005, 06:12 PM
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Default compression is low in #1 cylinder, should i get a new motor

this is my daily and i communte about 80 miles a day to school/work. the motor is a d16y7 with 192k. the test was 155 180 180 175. are those numbers ok, or should i throw a new longblock in there. i already have a teh tranny off casue im puttin a new clutch in
thanks in advance
Old 04-11-2005, 06:15 PM
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Default Re: compression is low in #1 cylinder, should i get a new motor (c1civic)

155 is pretty off from the others. you can rebuild it.
Old 04-11-2005, 06:33 PM
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never done a rebuild before, can get an estimeate on price
Old 04-11-2005, 06:57 PM
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Default Re: (c1civic)

u dont need a rebuild...give it a wet compression test..if the compression goes up chances are ur head gasket is shot...
Old 04-12-2005, 02:57 AM
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Please elaborate on what a wet compresiion test is
Old 04-12-2005, 09:29 AM
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anymore opinions
Old 04-12-2005, 09:38 AM
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Default Re: (c1civic)

Run it till you notice a large decrease in power, or a crapload of smoke. YOu never know it might run for another 150k miles like that.
Old 04-12-2005, 09:52 AM
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Ya dont even worry about that too much, that is still good compression numbers for that much mileage.. Try pooring a little oil couple table spoons in low cylinder and then do it again and see if it goes up.!
Also make sure you have injectors unplugged and you have car @ full throttle when starting it.
Old 04-12-2005, 09:54 AM
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Default Re: compression is low in #1 cylinder, should i get a new motor (c1civic)

screw rebuilding, get piston rings for 20 bucks and get a oil pan gasket and some thread lock, you'll be good as new
Old 04-12-2005, 10:01 AM
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Default Re: (flood)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by flood &raquo;</TD></TR><TR><TD CLASS="quote">Run it till you notice a large decrease in power, or a crapload of smoke. YOu never know it might run for another 150k miles like that.</TD></TR></TABLE>

That's what I'd do.

And when it finally goes, just find another engine and drop it in. It might cost you $250.00 or so and IMO it's easier to swap an entire engine rather than rebuild one.
Old 04-12-2005, 10:19 AM
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Default Re: (B18C5-EH2)

or just replace the head gasket now instead of running the car in the ground, blowing it, getting towed, new longblock.. shrug thats what 400-500, head gasket and studs are 120... takes all of what 3 hours for a noob to swap a head gasket
Old 04-12-2005, 10:37 AM
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Default Re: (menkio)

How can you guys determine it's the head gasket?

It could be a piston ring, cylinder wall, etc. etc.
Old 04-12-2005, 10:49 AM
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Default Re: (B18C5-EH2)

1. Cracked head. 2. Blown piston 3. Cracked Block 4. Blown head gasket 5. Broken valve component - spring, cracked seat, bent valve, bad lifter any of these could be your problem

Old 04-12-2005, 10:51 AM
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Default Re: (Lanceuppercut)

i dont think the car will be running with a blown pistion, cracked walls, or broke valvetrain.
the motor is old and showing some wear
Old 04-12-2005, 11:25 AM
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Default Re: (hayabusa160)

I never blown or cracked - I simply said piston ring or cylinder wall, meaning wear and tear.
Old 04-12-2005, 11:40 AM
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Default Re: (B18C5-EH2)

Did you do the compression test just to find out what it was at? or does it not run right?
Old 04-12-2005, 12:02 PM
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Default Re: (flood)

dude chances are the exhaust valve has too much **** around it and needs to be cleaned. run a leak down test your best bet to see what it really is. but that compression isnt too bad. just run it till it blows up and get a swap thats what i did.
Old 04-12-2005, 12:16 PM
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Default Re: (flood)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by flood &raquo;</TD></TR><TR><TD CLASS="quote">Run it till you notice a large decrease in power, or a crapload of smoke. You never know it might run for another 150k miles like that.</TD></TR></TABLE>
That may sound ghetto, but atleast it might give you a few more months to save up some money and what not. Just NO racing
Old 04-12-2005, 12:42 PM
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i already ahve the tranny off, should i go ahead and swap or should it run for a while, doesnt leak or burn anythign, seems to run fine, they tranny just got replaced due some nice grinding of second gear
Old 04-12-2005, 02:02 PM
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Default Re: (Lanceuppercut)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Lanceuppercut &raquo;</TD></TR><TR><TD CLASS="quote">1. Cracked head. 2. Blown piston 3. Cracked Block 4. Blown head gasket 5. Broken valve component - spring, cracked seat, bent valve, bad lifter any of these could be your problem</TD></TR></TABLE>
how would u know? last night u wanted to turn off vtec cuz it was tooo loud and u didnt even know what mods u have cuz the kid u bought it from said its far from factory
Old 04-12-2005, 04:39 PM
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i just id the comperession check to see how the motor was doing, seemed to run find minus the grinding tranny
Old 04-12-2005, 04:40 PM
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Default Re: (c1civic)

my motor made 250-260psi on 3 cyl but cyl 1 only made 220
but i still lay down 202whp so...
Old 04-12-2005, 05:52 PM
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very nice, busa...anyways thanks for all the help guys, im just going to put the new tranny and keep driving it.
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