help me diagnose these leakdown test results
11-22-2013, 01:33 PM
#1
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help me diagnose these leakdown test results
so i got some odd **** going.
my compression test results:
1 - 200psi
2- 240 psi
3- 240 psi
4 - 240 psi.
leakdown results
1- 40% - coming out of the #4 cylinder plug hole and rings to an extent...
all other cyls are 10-12% through the rings but i did build the motor a tad loose so im not concerned.
so the #1 cylinder pisses air out of the #4 plug, but, the #4 cylinder doesnt leak at all. wtf.
nothing was bubbling the coolant in the radiator. how would the air be getting clear across the motor like that?
my compression test results:
1 - 200psi
2- 240 psi
3- 240 psi
4 - 240 psi.
leakdown results
1- 40% - coming out of the #4 cylinder plug hole and rings to an extent...
all other cyls are 10-12% through the rings but i did build the motor a tad loose so im not concerned.
so the #1 cylinder pisses air out of the #4 plug, but, the #4 cylinder doesnt leak at all. wtf.
nothing was bubbling the coolant in the radiator. how would the air be getting clear across the motor like that?
11-22-2013, 05:26 PM
#2
Honda-Tech Member
Re: help me diagnose these leakdown test results
10-12 percent leakage is very significant, and I doubt your compression numbers are that high with that much leakage.
Lets start from the beginning shall we? Why are you performing these tests in the first place?
Lets start from the beginning shall we? Why are you performing these tests in the first place?
11-22-2013, 06:13 PM
#4
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Re: help me diagnose these leakdown test results
overflow catch can puked a bit of oil on my firewall today, so i check it before going further with problem diagnosis/solving.
most of my motors are built loose and have roughly 10% leakdown. its been like that for a decade that ive driving hundreds of thousands of miles on collectively. im tired of internet bullshit like everyones motor has 2%.
id like to think/hope something with the headgasket has to do withthe air leaking out of the other cylinder but its odd. how/why would the air make it to the 4th cylinder... i noticed recently the plugs were not holding carbon build up on the base ring like they used to. i was associating that with very small amounts of coolant making its way into the cylinders/manifold and helping to wash it off. the coolant loss was not significant enough to notice a drop in the level of the coolant overflow can
11-22-2013, 07:45 PM
#5
Honda-Tech Member
Re: help me diagnose these leakdown test results
motor is a 12:1 lsvtec with ctr cams so it has little overlap
overflow catch can puked a bit of oil on my firewall today, so i check it before going further with problem diagnosis/solving.
most of my motors are built loose and have roughly 10% leakdown. its been like that for a decade that ive driving hundreds of thousands of miles on collectively. im tired of internet bullshit like everyones motor has 2%.
id like to think/hope something with the headgasket has to do withthe air leaking out of the other cylinder but its odd. how/why would the air make it to the 4th cylinder... i noticed recently the plugs were not holding carbon build up on the base ring like they used to. i was associating that with very small amounts of coolant making its way into the cylinders/manifold and helping to wash it off. the coolant loss was not significant enough to notice a drop in the level of the coolant overflow can
overflow catch can puked a bit of oil on my firewall today, so i check it before going further with problem diagnosis/solving.
most of my motors are built loose and have roughly 10% leakdown. its been like that for a decade that ive driving hundreds of thousands of miles on collectively. im tired of internet bullshit like everyones motor has 2%.
id like to think/hope something with the headgasket has to do withthe air leaking out of the other cylinder but its odd. how/why would the air make it to the 4th cylinder... i noticed recently the plugs were not holding carbon build up on the base ring like they used to. i was associating that with very small amounts of coolant making its way into the cylinders/manifold and helping to wash it off. the coolant loss was not significant enough to notice a drop in the level of the coolant overflow can
Otherwise internet bullshit may be all you'll get.....
With that said, lets clarify your testing. Did you do both a leakdown test and a compression test?
11-22-2013, 10:55 PM
#6
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Re: help me diagnose these leakdown test results
motor is a 12:1 lsvtec with ctr cams so it has little overlap
overflow catch can puked a bit of oil on my firewall today, so i check it before going further with problem diagnosis/solving.
most of my motors are built loose and have roughly 10% leakdown. its been like that for a decade that ive driving hundreds of thousands of miles on collectively. im tired of internet bullshit like everyones motor has 2%.
id like to think/hope something with the headgasket has to do withthe air leaking out of the other cylinder but its odd. how/why would the air make it to the 4th cylinder... i noticed recently the plugs were not holding carbon build up on the base ring like they used to. i was associating that with very small amounts of coolant making its way into the cylinders/manifold and helping to wash it off. the coolant loss was not significant enough to notice a drop in the level of the coolant overflow can
overflow catch can puked a bit of oil on my firewall today, so i check it before going further with problem diagnosis/solving.
most of my motors are built loose and have roughly 10% leakdown. its been like that for a decade that ive driving hundreds of thousands of miles on collectively. im tired of internet bullshit like everyones motor has 2%.
id like to think/hope something with the headgasket has to do withthe air leaking out of the other cylinder but its odd. how/why would the air make it to the 4th cylinder... i noticed recently the plugs were not holding carbon build up on the base ring like they used to. i was associating that with very small amounts of coolant making its way into the cylinders/manifold and helping to wash it off. the coolant loss was not significant enough to notice a drop in the level of the coolant overflow can
Most good engines I have tested have around 1-4% leakage, from the rings. I use smoke testing to identify the leak source, makes it simple. Cylinders 1 and 4 are companions (360 out of phase with one another) which means both are at TDC. 2 and 3 are bottom, this would support cylinder wall damage (I will just say "leakage" to be correct) at the top of numbers 1 and 4.
The only way any significant quantity of air could make it into the number 4 plug hole is a massive leak in number one and four, the only common space they share is the crankcase, so you have a ring leak or a broken ring land.
This phantom coolant leak you speak of, does it affect all cylinders equally? What ring are you referring to, the compression (top ring) or the second ring?
11-23-2013, 05:33 AM
#7
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Re: help me diagnose these leakdown test results
Most good engines I have tested have around 1-4% leakage, from the rings. I use smoke testing to identify the leak source, makes it simple. Cylinders 1 and 4 are companions (360 out of phase with one another) which means both are at TDC. 2 and 3 are bottom, this would support cylinder wall damage (I will just say "leakage" to be correct) at the top of numbers 1 and 4.
The only way any significant quantity of air could make it into the number 4 plug hole is a massive leak in number one and four, the only common space they share is the crankcase, so you have a ring leak or a broken ring land.
This phantom coolant leak you speak of, does it affect all cylinders equally? What ring are you referring to, the compression (top ring) or the second ring?
The only way any significant quantity of air could make it into the number 4 plug hole is a massive leak in number one and four, the only common space they share is the crankcase, so you have a ring leak or a broken ring land.
This phantom coolant leak you speak of, does it affect all cylinders equally? What ring are you referring to, the compression (top ring) or the second ring?
i also agree that the crank is the only thing the 1 and 4 cyls share, and would be perfectly fine with it if the air would blow both ways between cyls. its very likely/possible there is ring/ringland/cylinder wall damage in #1 cyl. but why would the air from 1 make it over to #4 but not the other way around??? is there a check valve between my piston rings i dont know about
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11-23-2013, 06:06 PM
#8
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Re: help me diagnose these leakdown test results
oh well. motor is out, jdm b20 w/p8r head going in. ill take the lsvtec apart in the next few weeks and update the final verdict in case someone searches this in the future. till then, happy thanksgiving fools!
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