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Old 02-02-2011, 09:19 PM
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Compression Test Results

After buying my major project 94 with a H23 and 115,000 miles I realized it was smoking a little bit of white smoke or steam. Since the smoke I have been leading towards the head gasket. I decided to conduct the compression test cold, hot and hot with oil. [All listed cylinders 1-4] The cold test was 148, 148, 148, and 150. The hot test was 146, 150, 150, and 150. The hot test with oil was 170, 175, 180, and 173. I am waiting on the leak down tester to confirm the gasket is bad. I was wondering if anyone else has any input on the compression test numbers. They seemed kind of low without placing oil in the cylinders. I am running rich since i have a CEL 8 & 41 (TDC&O2 sensors); that I have not got around to troubleshooting, not sure if that has any effect on the smoking or not. I did some searching and seems that my conditions are head gasket related. Just wanted some more opinion before I open up the motor, because if its more than a head gasket then I will just swap to the H22.
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Old 02-02-2011, 11:42 PM
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Re: Compression Test Results

those numbers look very VERY good, i wouldn't worry about a thing (head gasket wise)

maybe just a coolant leak dripping into the exhaust or something?
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Old 02-03-2011, 01:13 AM
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Re: Compression Test Results

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Originally Posted by twokexlv6coupe View Post
those numbers look very VERY good, i wouldn't worry about a thing (head gasket wise)

maybe just a coolant leak dripping into the exhaust or something?

Thank you, I was thinking the numbers without oil were low. I am not sure what the cause is and not really sure how the coolant would be getting into the exhaust other than the head gasket or maybe an internal crack in the block?
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Old 02-03-2011, 01:25 AM
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Re: Compression Test Results

what does the exaust smell like?
sweet
oily
gassy(not buffalo wing gassy!)
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Old 02-03-2011, 03:07 AM
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Re: Compression Test Results

For comparison, my engine has 200k miles and made 175 hot all across. 150 is weak, and if adding oil to the test improved compression, that normally points to rings. Do you have any oil/coolant mixing in the radiator or crank case?
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Old 02-03-2011, 09:00 AM
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Re: Compression Test Results

you probably have a coolant leak
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Old 02-03-2011, 10:45 AM
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Re: Compression Test Results

just to chime in here guys .invader hit it on the head wet shows leaking rings if numbers are higher .
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Old 02-03-2011, 04:55 PM
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Re: Compression Test Results

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Originally Posted by InvaderTrax View Post
For comparison, my engine has 200k miles and made 175 hot all across. 150 is weak, and if adding oil to the test improved compression, that normally points to rings. Do you have any oil/coolant mixing in the radiator or crank case?
Agreed. oil should push the compression up on any motor, but just a bit. That large of a jump and with its consistency says rings are worn.

I'm not sure I would be too worried though. Some wear is normal and the compression numbers are very consistent amongst all the cylinders. I would think the motor is still very healthy for what it is.

A Headgasket isnt something I would be looking to replace without serious signs the headgasket is done. But, that leakdown test will tell you that. So, perform away..
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Old 02-03-2011, 08:28 PM
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Re: Compression Test Results

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Originally Posted by ranger11x View Post
what does the exaust smell like?
sweet
oily
gassy(not buffalo wing gassy!)
a little sweet but not that bad at all. Smoking only slightly at idle but a little more when the rpms rise. I also can not drive the car currently as it is almost completely taken apart for bodywork/paint and not registered, so I can only idle/rev the engine.

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Originally Posted by InvaderTrax View Post
For comparison, my engine has 200k miles and made 175 hot all across. 150 is weak, and if adding oil to the test improved compression, that normally points to rings. Do you have any oil/coolant mixing in the radiator or crank case?
Thanks for the number comparision. The oil is clean not milky and the radiator fluid is dirty so hard to tell. I will be draining the coolant once I figure out what is wrong. I figured the rings were worn but not sure where the coolant could be coming from.

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Originally Posted by johnthompson View Post
you probably have a coolant leak
I am not sure where to begin to look other than the headgasket. I am more electrically inclined but I have replaced head gaskets on a several Accords and Civics.

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Originally Posted by JohnL114 View Post
just to chime in here guys .invader hit it on the head wet shows leaking rings if numbers are higher .
Thanks for the input, would I expect a darker smoke from oil blow by?

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Originally Posted by lilbluelude View Post
Agreed. oil should push the compression up on any motor, but just a bit. That large of a jump and with its consistency says rings are worn.

I'm not sure I would be too worried though. Some wear is normal and the compression numbers are very consistent amongst all the cylinders. I would think the motor is still very healthy for what it is.

Thank you, that is why I posted the numbers, they were all very consistent and there was no smoking gun for the cause of the smoke.

A Headgasket isnt something I would be looking to replace without serious signs the headgasket is done. But, that leakdown test will tell you that. So, perform away..
Going to get the tester this weekend my friend can not find his. I will let everyone know the results. If anyone has any input on some other possibilites I am open to all feedback. Thanks everyone for the input so far.
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