bucketep91 Posted April 8, 2009 Posted April 8, 2009 I've been getting some oil sweating from the oil breather so i done a compreseion test last nightresults wer10.610.310.610.0but the 3rd sprak plug was covered in oil, any 1 know whats the problem? Quote
Asad Posted April 8, 2009 Posted April 8, 2009 If they ^ were in BAR....153.74 149.38153.74145.03...PSIthink 150-180 is what your looking for...imo its ok for now but i`d keep on top of it and do another test in a few months while saving for a re-build i.e mabe forged? Quote
bucketep91 Posted April 8, 2009 Author Posted April 8, 2009 If they ^ were in BAR....153.74 149.38153.74145.03...PSIthey where thanks. so is this good or bad? and whats tyhe story with the oily spark plug? Quote
Guest dominodon Posted April 8, 2009 Posted April 8, 2009 Did you do the test this way ?Heat up the engine till it comes to operating temp. Then unplug the main plug from the distirbutor cap so not be able to start the car also the efi fuse so you dont spray fuel anymore during cranking. Then take out the first spark plug and fit the compression gauge. Get inside and crank the engine at wot till the gauge comes to the maximun level can reach. In simple speaking goes up and up every cycle and then stop. When it is stoped then this is your reading. Then take the tester out and repeat to the other 3 cylinders. What you looking for is almost equall readings on all cylinders at first and second if a stock low milage engine 140-180 psi. After test is done dont forget the main plug and the efi fuse or else you will not be able to start the car.From cylinder to cylinder dont forget to bleed the gauge to be 0 before you start the new measurment. Quote
Guest dominodon Posted April 8, 2009 Posted April 8, 2009 The compression should be between 140 and 180 accross all 4, asll should be well balanced resultsJust to give you a idea on mine result done on a warm engine and throttle open the result was (1)160 psi(2)161 psi(3)159 psi(4)161 psihope this helps Quote
bucketep91 Posted April 8, 2009 Author Posted April 8, 2009 i borrowed a guys compression tester it was a digital thing u dont need to bleed it you just select each cylinder on the screen, do the test 1 by 1 then it prints out a little reciept showing your results, other than that i did the same as u just said Quote
Guest dominodon Posted April 8, 2009 Posted April 8, 2009 Even better then digital, your result is ok could be better. Quote
bucketep91 Posted April 8, 2009 Author Posted April 8, 2009 Even better then digital, your result is ok could be better.whatsw the story with the oily plug though? Quote
Guest dominodon Posted April 8, 2009 Posted April 8, 2009 we need to see pics mate, cant tell intill we see..how old are the plugs Quote
bucketep91 Posted April 8, 2009 Author Posted April 8, 2009 we need to see pics mate, cant tell intill we see..how old are the plugsbout 9-10 months denso 1s with 5 + on them, im guessing thas heat range, its only the 3rd oplug, had some oil on it Quote
Guest dominodon Posted April 8, 2009 Posted April 8, 2009 Ok mate, if you can post up a pic off the oil plug we can see if its normal Quote
Marc0 Posted April 8, 2009 Posted April 8, 2009 Ok mate, if you can post up a pic off the oil plug we can see if its normalI've heard that a 10% difference between any of the cilinders is bad. Also when they are obviously very low.I had a compression test done in february. Mij results (1991 4E-FTE) were 11,5 bar on all cilinders. Quote
montanajr Posted April 8, 2009 Posted April 8, 2009 Funnily enough I did a compression test earlier today...results were:Cyl1: 12bar (174psi)Cyl2: 11.8bar (171psi)Cyl3: 11.8bar (171psi)Cyl4: 12bar (174psi) Quote
BoostJunkie Posted April 13, 2009 Posted April 13, 2009 Another thing that should be noted in doing a comp test is i've always been told to spray oil down the cylinders to help seal the rings. Quote
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