compression test?

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1992hatch
Posts: 91
Joined: Sun Apr 20, 2008 5:40 am
Car: 91 coupe 5spd
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i did one to day and the numbers are c1 132 c2 135 c3 145 c4 140 myu car has 178,000 on it should i be concerned about the low numbersalso im thinking of putting a turbo on it yes i have read the secion about it says that it really needs to be 155 across the board but the oil pressure is really good 60 at idle when cold and 25 when hot the reason i did the test is because it stumbles some times when i give it full gas new tune up on it please give me your feed back thanks


Rucca
Posts: 223
Joined: Thu Jul 19, 2007 4:10 am

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Your numbers are low but relatively even. Assuming you did the test right, I would not turbo that car. Be sure you conduct your test with the throttle wide open on a warm engine. Also, add oil to the cylinders and do a second test. If oil causes the numbers go up the problem is in the bottom end, if they stay the same it's a top end problem.

Oil pressure spec at hot idle is 11psi.

Edit: Actually I just read it says "more than 11psi" so I guess you are ok there.
Modified by Rucca at 6:23 PM 4/29/2008

mifesto
Posts: 6
Joined: Sun Jul 15, 2007 7:33 pm
Car: mitsu evo

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if you had an SR then those numbers are alil low but not terrible. for a KA, yeah its pretty low.

180sxn
Posts: 21
Joined: Thu May 01, 2008 5:35 pm
Car: 95 S14 240SX SE

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Time for new rings.


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