Honda Civic / Del Sol (1992 - 2000) EG/EH/EJ/EK/EM1 Discussion

why is my compression so high? gsr 240 psi across

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Old Oct 17, 2008 | 08:08 PM
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Default why is my compression so high? gsr 240 psi across

i just changed my valve seals today, the car started right up and ran fine, at running temp i did a compression test.. it read 240(+-5)psi in each cylinder, its a 96 stock gsr is this too high? isnt it supposed to be 210ish?
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Old Oct 17, 2008 | 08:26 PM
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Default Re: why is my compression so high? gsr 240 psi across (2wheelhunter)

What cams are in the motor? That will have an effect on the compression test as well. I have seen many stock B series motors make 210-250 psi, so I dont think its that uncommon.
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Old Oct 17, 2008 | 09:09 PM
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Default Re: why is my compression so high? gsr 240 psi across (VTECJUN)

all i can say is kaboom, dont let it happen
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Old Oct 17, 2008 | 09:15 PM
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Default Re: why is my compression so high? gsr 240 psi across (skaternak)

stock cams everything is stock....

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by skaternak &raquo;</TD></TR><TR><TD CLASS="quote">all i can say is kaboom, dont let it happen</TD></TR></TABLE>

whats going to make it blow up?
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Old Oct 17, 2008 | 09:18 PM
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Default Re: why is my compression so high? gsr 240 psi across (2wheelhunter)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by skaternak &raquo;</TD></TR><TR><TD CLASS="quote">all i can say is kaboom, dont let it happen</TD></TR></TABLE>

Wtf are you talking about, why the hell is it going to kaboom, that is not even a word neither does that help the op with his problem Please leave your stupid comments to yourself.
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Old Oct 17, 2008 | 09:29 PM
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Default Re: why is my compression so high? gsr 240 psi across (Historyg)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Historyg &raquo;</TD></TR><TR><TD CLASS="quote">

Wtf are you talking about, why the hell is it going to kaboom, that is not even a word neither does that help the op with his problem Please leave your stupid comments to yourself. </TD></TR></TABLE>
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Old Oct 18, 2008 | 07:47 AM
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Default Re: why is my compression so high? gsr 240 psi across (skaternak)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by skaternak &raquo;</TD></TR><TR><TD CLASS="quote">all i can say is kaboom, dont let it happen</TD></TR></TABLE> to people who dont know how to keep their mouths shut and think they actually know things about cars...i expected this to be in the integra forum not the civic del sol come on man step your game up hahaha
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Old Oct 18, 2008 | 08:11 AM
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Default Re: why is my compression so high? gsr 240 psi across (turbojdmhatch)

You should be alright. Maybe it's just the motor that's strong....


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Old Oct 18, 2008 | 08:13 AM
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Default

the head has probably been milled or upgraded cam before. run higher octane gas see if its faster.
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Old Oct 18, 2008 | 08:21 AM
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Default Re: why is my compression so high? gsr 240 psi across (2wheelhunter)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 2wheelhunter &raquo;</TD></TR><TR><TD CLASS="quote">stock cams everything is stock.... </TD></TR></TABLE>

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MrXclusivE &raquo;</TD></TR><TR><TD CLASS="quote">the head has probably been milled or upgraded cam before. run higher octane gas see if its faster.</TD></TR></TABLE>

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Old Oct 18, 2008 | 08:32 AM
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Default Re: why is my compression so high? gsr 240 psi across (turbojdmhatch)

yeah but still could've been rebuilt and milled because it was warped or something, that'll bump up the compression. anyhow who doesn't like higher compression? lol I would go 91 or 94 octane see if it makes a difference
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Old Oct 18, 2008 | 08:32 AM
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Default Re: why is my compression so high? gsr 240 psi across (turbojdmhatch)

240 across the board?? sounds like a beautifully healthy GSR motor. high octane it like already said and dyno it.
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Old Oct 18, 2008 | 08:39 AM
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Default Re: why is my compression so high? gsr 240 psi across (davefromPA)

240psi is normal for a JDM GSR~10.6:1 ratio motor
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Old Oct 18, 2008 | 08:54 AM
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Sorry to thread jack but what would be normal PSI on a 94 GSR stock? 10.0:1 comp
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Old Oct 18, 2008 | 09:14 AM
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Default Re: (boondocks1805)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by boondocks1805 &raquo;</TD></TR><TR><TD CLASS="quote">Sorry to thread jack but what would be normal PSI on a 94 GSR stock? 10.0:1 comp</TD></TR></TABLE>

around 200-210psi

my stock JDM ITR motor around 270psi (11.1:1)

what’s more important about compression tests is the consistency between cylinders


Modified by sicones at 10:19 AM 10/18/2008
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Old Oct 18, 2008 | 09:35 AM
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Default

only reason i asked is I had a comp a leakdown test and I got 165 psi per cyl
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Old Oct 18, 2008 | 11:40 AM
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Default Re: (boondocks1805)

well thanks guys for your help we'll try some higher octane lol
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