Compression

ONLY for ADVANCED technical discussion about the 240sx!
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ZwhiteshadowZ
Posts: 10
Joined: Sun Mar 14, 2004 2:56 pm

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I have very low compression in #'s 2,4 does any one know why these 2 cylinders would have low compression?


gyfer
Posts: 395
Joined: Mon Oct 14, 2002 7:30 pm

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make sure engine is it operation temperature before you check it.

what's the number ?

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ZwhiteshadowZ
Posts: 10
Joined: Sun Mar 14, 2004 2:56 pm

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#1. 160 #2. 30 #3. 120 #4. 30 .... any ideas?

Stuntman240
Posts: 198
Joined: Tue Aug 05, 2003 9:01 am
Car: 91 coupe

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rings? scratches on cylinder wall? valves stuck? could be an no. of things

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ZwhiteshadowZ
Posts: 10
Joined: Sun Mar 14, 2004 2:56 pm

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how would i be able to tell if vavles are bent w/o takin off the head.... if each one looks like its comin up right could it still be bent?

gyfer
Posts: 395
Joined: Mon Oct 14, 2002 7:30 pm

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KA24E or DE ?

Try to add some oil into the cylinder, through your spark plug hole.If you see efficeient amout of compression increase(after putting the oil), you have a bad piston ring.

Is interesting you have both 2 and 4 in 30psi. But the #3 is 120 ? that's not good...


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