Compression numbers

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11-17-2007, 03:34 PM

Sevarg710X

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Compression numbers

Ok it's a 91 with 98,xxx . did a compression test and numbers were 120,130,130,140 . Are these numbers okay ?

11-17-2007, 04:57 PM

MS!3

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sorry man, might be time for a rebuild. should be reading at least 160 or so.

11-17-2007, 09:57 PM

Sevarg710X

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Seriously ? I thought they were okay as long as they were within like 10% of eachother

11-18-2007, 12:36 AM

Biggamehit

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na bro... that 10 over or under the max 179 and lowest 151

that motor is way gone bro

so if it was like 175 175 175 180 that would be ok

Last edited by Biggamehit; 11-18-2007 at 12:46 AM.

11-18-2007, 10:05 AM

KFL

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Did you properly do the test..ie warm up car, and hold gas open while cranking.. sometimes people forget 1 or the other..

11-18-2007, 10:27 AM

slos14

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the motor only has 98k an it has that low of comp . **** man my car has 180k on it an its at 180 in all 4 . thats nutz

11-18-2007, 10:39 AM

Initial Daniel

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Yeah, mine was 175 ---> 180.

...and the dude who bought it still blew the motor. LOL.

11-18-2007, 12:38 PM

Sevarg710X

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I didn't hold the gas open while cranking . I'll try again and repost .

11-19-2007, 06:58 AM

nissandrift

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If your numbers are still close, after doing it at WOT... you may want to try another compression tester. The gauge may not be calibrated, and if thats the case you may be fine.

11-19-2007, 08:47 AM

#10

BigVinnie

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Make sure that oil was well circulated as well through out each cylinder.
Heavier weight can bring those compression numbers up.

11-19-2007, 09:11 AM

#11

nissandrift

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On that note if you pour a very little amount of oil down each cylinder when testing you can see if the rings are your problem... if the numbers go way up.

11-19-2007, 09:21 AM

#12

Bumnah

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just for to put the information out there.
the 170+ compression numbers are for cars that can turn over on their own.

if you were doing a compression check by hand cranking the numbers will not be that high. while hand cranking my old ka24de and doing a compression check, it was hitting 110-120 (if i remember correctly) per cylinder. i did each cylinder twice, and got consistent numbers every time. you can also hear it sucking in air from the open spark plug holes while rotating by hand. another thing to look for when checking out a motor to see how it is doing.