if i add a cap of oil into the cylinders and the compression raise will this consider my rings are bad?? compression before- 150psi after a cap of oil compression around 200psi. pistons are 9:1 compression and motor has about 1k miles on it.

 

anyone

 

After all your searching, what do YOU think?

 

150 psi with a 9:1 motor isnt that bad. What is the issue that is causing you to check it.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by blkb18 &raquo;</TD></TR><TR><TD CLASS="quote">150 psi with a 9:1 motor isnt that bad. What is the issue that is causing you to check it.</TD></TR></TABLE>

because when i had an 81mm 9:1 the compression was in the 180psi range. And now i have a 84mm with 9:1 and now is 150psi. im dont want to throw on the turbo kit and get the car tune if the rings are bad or didnt seal good.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DonF &raquo;</TD></TR><TR><TD CLASS="quote">After all your searching, what do YOU think? </TD></TR></TABLE>

im thinking its the piston rings but just im not 100% sure.

 

Is this a fresh build?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by blkb18 &raquo;</TD></TR><TR><TD CLASS="quote">Is this a fresh build?</TD></TR></TABLE>

yes the motor has about 1k miles on it now.

 

those numbers do seem a bit low for a fresh build, did you clock the rings correctly? Did you check compression when the motor was new? If not then you might have another issue, If you did then and they were higher than I might say something isn't right. Are all the numbers within a few psi of each other? Do a leak down test a make sure it isnt your valves.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by srmofo &raquo;</TD></TR><TR><TD CLASS="quote">those numbers do seem a bit low for a fresh build, did you clock the rings correctly? Did you check compression when the motor was new? If not then you might have another issue, If you did then and they were higher than I might say something isn't right. Are all the numbers within a few psi of each other? Do a leak down test a make sure it isnt your valves. </TD></TR></TABLE>

the rings were clock correctly. when it was a fresh built i did check the compression. it was around 135psi range and i thought i would go up as i break in the motor but i didnt go much. 3 cylinders were 155 and 1 cylinder was 140. i did a cylinder leakdown and i got about 50 to 60% leakage. when i add oil to the rings the all compression jump to 200psi. will this be the rings?

 

yeah the oil trick confirms bad rings. 50 to 60% leakage is way to much, did you set each cylinder at TDC compression stroke? Cause that much leakage I would expect your compression to be even lower. I checked mine after my build I was immediately at 185, did you bore and hone the cylinders?, was it a machine shop or a DIY hone tool? If the cylinders werent honed then that could be your problem.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by srmofo &raquo;</TD></TR><TR><TD CLASS="quote">yeah the oil trick confirms bad rings. 50 to 60% leakage is way to much, did you set each cylinder at TDC compression stroke? Cause that much leakage I would expect your compression to be even lower. I checked mine after my build I was immediately at 185, did you bore and hone the cylinders?, was it a machine shop or a DIY hone tool? If the cylinders werent honed then that could be your problem.</TD></TR></TABLE>

each cylinders was set to tdc when performing leakdown test. the machine shop bore it to 84mm with my piston given to him . i would think that he would hone it to. it did kinda look like it was hone. compression test when motor was on the stand was around 100-135psi. i would hate to take everything a part again.

 

you could try dropping the pan and tray, look for ring pieces in the pan, and then look up into the cylinder walls for any damage....when you do the leak down test, have you taken the oil cap off and listened for the air escaping into the crankcase...I know that sucks having to tear it down again, but its either now, before stuff breaks or later, after stuff breaks

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by srmofo &raquo;</TD></TR><TR><TD CLASS="quote">you could try dropping the pan and tray, look for ring pieces in the pan, and then look up into the cylinder walls for any damage....when you do the leak down test, have you taken the oil cap off and listened for the air escaping into the crankcase...I know that sucks having to tear it down again, but its either now, before stuff breaks or later, after stuff breaks</TD></TR></TABLE>

i just did an oil change last week and i didnt see anything items coming out from the drain. i'll let into the wall to see how they are. when i perform the leakdown test i couldnt find where the air was leaking to. i forgot to tell you that this was the second time the ring was replace. the first rings that came with the piston were wrong so i order new ones. the wrong rings compression reading are also the same as the one in the car now. i thought that the new rings would be higher but it end up being the same as the old wrong ones.