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compression test



 
 
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  #1  
Old February 6th 10, 10:08 PM posted to rec.autos.makers.saturn
danielr
external usenet poster
 
Posts: 19
Default compression test

I ride a 1997 SL SOHC, 185.000 Km, standard transmission.
Oil is changed every 3500 Km, I use Castrol Synthetic 5W30, and K&N
oil filter.
I know; some of you might believe it is a waste of money; but I am a
FIRM believer of preventive maintenance.
I am VERY satisfied with this car.
Question:
Which should be range (max / min) of values resulting in a compression
test for this engine?
Thanks in advance for your assitance.
Regards,

danielr
Ads
  #2  
Old February 8th 10, 02:15 AM posted to rec.autos.makers.saturn
Oppie[_7_]
external usenet poster
 
Posts: 175
Default compression test

Rule of thumb is 125-150 psi depending on the compression ratio of the
engine. Make the compression test with all plugs removed, the ignition coil
disconnected and wide open throttle. Crank for 5 seconds to get a stable
reading. Log readings, do all cylinders and then repeat. Make sure you get
consistent readings on each cylinder. Readings between all cylinders should
be within 5-10 psi. If you get a cylinder that reads low, put a couple of
squirts of oil into the cylinder and repeat the test. If the reading comes
up, most likely worn piston rings. If the reading stays low, could be head
gasket or valves. Don't forget to label the plug wires as you remove them to
make sure they all go back in the right places.

"danielr" > wrote in message
...
> I ride a 1997 SL SOHC, 185.000 Km, standard transmission.
> Oil is changed every 3500 Km, I use Castrol Synthetic 5W30, and K&N
> oil filter.
> I know; some of you might believe it is a waste of money; but I am a
> FIRM believer of preventive maintenance.
> I am VERY satisfied with this car.
> Question:
> Which should be range (max / min) of values resulting in a compression
> test for this engine?
> Thanks in advance for your assitance.
> Regards,
>
> danielr


  #3  
Old February 8th 10, 09:46 AM posted to rec.autos.makers.saturn
Private
external usenet poster
 
Posts: 145
Default compression test


> "danielr" > wrote in message
> ...
>> I ride a 1997 SL SOHC, 185.000 Km, standard transmission.
>> Oil is changed every 3500 Km, I use Castrol Synthetic 5W30, and K&N
>> oil filter.
>> I know; some of you might believe it is a waste of money; but I am a
>> FIRM believer of preventive maintenance.
>> I am VERY satisfied with this car.
>> Question:
>> Which should be range (max / min) of values resulting in a compression
>> test for this engine?
>> Thanks in advance for your assitance.
>> Regards,
>>
>> danielr

>

"Oppie" > wrote in message
...
> Rule of thumb is 125-150 psi depending on the compression ratio of the
> engine. Make the compression test with all plugs removed, the ignition
> coil disconnected and wide open throttle. Crank for 5 seconds to get a
> stable reading. Log readings, do all cylinders and then repeat. Make sure
> you get consistent readings on each cylinder. Readings between all
> cylinders should be within 5-10 psi. If you get a cylinder that reads low,
> put a couple of squirts of oil into the cylinder and repeat the test. If
> the reading comes up, most likely worn piston rings. If the reading stays
> low, could be head gasket or valves. Don't forget to label the plug wires
> as you remove them to make sure they all go back in the right places.
>


@278,000 km my 96 SOHC 5sp pumped to
155 lbs dry and warm, and 230-270 lbs with oil added,
(the 230 cylinders had less oil than the 270 ones.)

Adding more oil will seal the rings better but will also raise the
compression ratio, I should have measured the added oil better by counting
the oil can squirts and adding the same number.

Previous test @178,000 km pumped 130/128/131/130 warm and 128/126/128/125
cool and 220/185/225/215 oiled warm and 190/155/185/185 oiled cool. The
center cylinders were retested 1,000 km later both 160 psi warm. I suspect
a piece of crud on valve in #2 cyl during first oiled test.

YMMV depending on accuracy of your gauge, I think mine is OK and was top
quality and quite expensive in its day but is about 35 yrs old. As Oppie
topposted, your results are probably more important relative to each other
cylinder after dry and wet testing, as these results will all be with the
same tester. Record your results in your maintenance log and then you can
compare them in another 50 or 100,000 km to detect any trends.

Many mechanics will debate the value of compression testing and will often
advocate for a cylinder leak down test as being a superior test, but a plain
compression test is easier and uses simpler tools and will quickly find
large problems like one bad cylinder or valve.

Good luck, YMMV, make sure you have locked the throttle butterfly valve in
open position for test, IMHO warm is best for reliable results and
consistency.


  #4  
Old February 8th 10, 08:39 PM posted to rec.autos.makers.saturn
danielr
external usenet poster
 
Posts: 19
Default compression test

On Feb 8, 3:46*am, "Private" > wrote:
> > "danielr" > wrote in message
> ...
> >> I ride a 1997 SL SOHC, 185.000 Km, standard transmission.
> >> Oil is changed every 3500 Km, I use Castrol Synthetic 5W30, and K&N
> >> oil filter.
> >> I know; some of you might believe it is a waste of money; but I am a
> >> FIRM believer of preventive maintenance.
> >> I am VERY satisfied with this car.
> >> Question:
> >> Which should be range (max / min) of values resulting in a compression
> >> test for this engine?
> >> Thanks in advance for your assitance.
> >> Regards,

>
> >> danielr

>
> "Oppie" > wrote in message
>
> ...
>
> > Rule of thumb is 125-150 psi depending on the compression ratio of the
> > engine. Make the compression test with all plugs removed, the ignition
> > coil disconnected and wide open throttle. Crank for 5 seconds to get a
> > stable reading. Log readings, do all cylinders and then repeat. Make sure
> > you get consistent readings on each cylinder. *Readings between all
> > cylinders should be within 5-10 psi. If you get a cylinder that reads low,
> > put a couple of squirts of oil into the cylinder and repeat the test. If
> > the reading comes up, most likely worn piston rings. If the reading stays
> > low, could be head gasket or valves. Don't forget to label the plug wires
> > as you remove them to make sure they all go back in the right places.

>
> @278,000 km my 96 SOHC 5sp pumped to
> 155 lbs dry and warm, and 230-270 lbs with oil added,
> (the 230 cylinders had less oil than the 270 ones.)
>
> Adding more oil will seal the rings better but will also raise the
> compression ratio, I should have measured the added oil better by counting
> the oil can squirts and adding the same number.
>
> Previous test @178,000 km pumped 130/128/131/130 warm and 128/126/128/125
> cool and 220/185/225/215 oiled warm and 190/155/185/185 oiled cool. *The
> center cylinders were retested 1,000 km later both 160 psi warm. *I suspect
> a piece of crud on valve in #2 cyl during first oiled test.
>
> YMMV depending on accuracy of your gauge, I think mine is OK and was top
> quality and quite expensive in its day but is about 35 yrs old. *As Oppie
> topposted, your results are probably more important relative to each other
> cylinder after dry and wet testing, as these results will all be with the
> same tester. *Record your results in your maintenance log and then you can
> compare them in another 50 or 100,000 km to detect any trends.
>
> Many mechanics will debate the value of compression testing and will often
> advocate for a cylinder leak down test as being a superior test, but a plain
> compression test is easier and uses simpler tools and will quickly find
> large problems like one bad cylinder or valve.
>
> Good luck, YMMV, make sure you have locked the throttle butterfly valve in
> open position for test, IMHO warm is best for reliable results and
> consistency.- Hide quoted text -
>
> - Show quoted text -


Hi "Oppie"

Thank you very much for your help.
Regards,

danielr
  #5  
Old February 8th 10, 10:18 PM posted to rec.autos.makers.saturn
Oppie[_8_]
external usenet poster
 
Posts: 56
Default compression test



"danielr" > wrote in message
...
> On Feb 8, 3:46 am, "Private" > wrote:
>> > "danielr" > wrote in message
>> ...
>> >> I ride a 1997 SL SOHC, 185.000 Km, standard transmission.
>> >> Oil is changed every 3500 Km, I use Castrol Synthetic 5W30, and K&N
>> >> oil filter.
>> >> I know; some of you might believe it is a waste of money; but I am a
>> >> FIRM believer of preventive maintenance.
>> >> I am VERY satisfied with this car.
>> >> Question:
>> >> Which should be range (max / min) of values resulting in a compression
>> >> test for this engine?
>> >> Thanks in advance for your assitance.
>> >> Regards,

>>
>> >> danielr

>>
>> "Oppie" > wrote in message
>>
>> ...
>>
>> > Rule of thumb is 125-150 psi depending on the compression ratio of the
>> > engine. Make the compression test with all plugs removed, the ignition
>> > coil disconnected and wide open throttle. Crank for 5 seconds to get a
>> > stable reading. Log readings, do all cylinders and then repeat. Make
>> > sure
>> > you get consistent readings on each cylinder. Readings between all
>> > cylinders should be within 5-10 psi. If you get a cylinder that reads
>> > low,
>> > put a couple of squirts of oil into the cylinder and repeat the test.
>> > If
>> > the reading comes up, most likely worn piston rings. If the reading
>> > stays
>> > low, could be head gasket or valves. Don't forget to label the plug
>> > wires
>> > as you remove them to make sure they all go back in the right places.

>>
>> @278,000 km my 96 SOHC 5sp pumped to
>> 155 lbs dry and warm, and 230-270 lbs with oil added,
>> (the 230 cylinders had less oil than the 270 ones.)
>>
>> Adding more oil will seal the rings better but will also raise the
>> compression ratio, I should have measured the added oil better by
>> counting
>> the oil can squirts and adding the same number.
>>
>> Previous test @178,000 km pumped 130/128/131/130 warm and 128/126/128/125
>> cool and 220/185/225/215 oiled warm and 190/155/185/185 oiled cool. The
>> center cylinders were retested 1,000 km later both 160 psi warm. I
>> suspect
>> a piece of crud on valve in #2 cyl during first oiled test.
>>
>> YMMV depending on accuracy of your gauge, I think mine is OK and was top
>> quality and quite expensive in its day but is about 35 yrs old. As Oppie
>> topposted, your results are probably more important relative to each
>> other
>> cylinder after dry and wet testing, as these results will all be with the
>> same tester. Record your results in your maintenance log and then you
>> can
>> compare them in another 50 or 100,000 km to detect any trends.
>>
>> Many mechanics will debate the value of compression testing and will
>> often
>> advocate for a cylinder leak down test as being a superior test, but a
>> plain
>> compression test is easier and uses simpler tools and will quickly find
>> large problems like one bad cylinder or valve.
>>
>> Good luck, YMMV, make sure you have locked the throttle butterfly valve
>> in
>> open position for test, IMHO warm is best for reliable results and
>> consistency.- Hide quoted text -
>>
>> - Show quoted text -

>
> Hi "Oppie"
>
> Thank you very much for your help.
> Regards,
>
> danielr


And thank you 'Private' for your input also.

  #6  
Old February 13th 10, 02:02 PM posted to rec.autos.makers.saturn
navaidstech
external usenet poster
 
Posts: 37
Default compression test


Let's see... I've got a 92 SL1 SOHC with 553,000 km on it. Been
putting Castrol Synth in it and a cheap Motomaster oil filter since
the car had 100,000 km on the odometer. I change my oil every 10,000
kms.
Did a compression test about a month ago and got 185-190 PSI in all
cylinders dry and cold. Didn't bother putting any oil in the cylinders
to do further checks, since I was happy with the readings.
Hope this helps!

Alex
  #7  
Old February 14th 10, 01:39 PM posted to rec.autos.makers.saturn
danielr
external usenet poster
 
Posts: 19
Default compression test

On Feb 13, 8:02*am, navaidstech > wrote:
> Let's see... I've got a 92 SL1 SOHC with 553,000 km on it. Been
> putting Castrol Synth in it and a cheap Motomaster oil filter since
> the car had 100,000 km on the odometer. I change my oil every 10,000
> kms.
> Did a compression test about a month ago and got 185-190 PSI in all
> cylinders dry and cold. Didn't bother putting any oil in the cylinders
> to do further checks, since I was happy with the readings.
> Hope this helps!
>
> Alex


Thanks Alex;
It certainly does, as it provides a reference to effectiveness of the
same oil I'm using.
Thank you very much.again
danielR
  #8  
Old February 18th 10, 01:25 AM posted to rec.autos.makers.saturn
navaidstech
external usenet poster
 
Posts: 37
Default compression test

On Feb 14, 7:39*am, danielr > wrote:
> On Feb 13, 8:02*am, navaidstech > wrote:
>
> > Let's see... I've got a 92 SL1 SOHC with 553,000 km on it. Been
> > putting Castrol Synth in it and a cheap Motomaster oil filter since
> > the car had 100,000 km on the odometer. I change my oil every 10,000
> > kms.
> > Did a compression test about a month ago and got 185-190 PSI in all
> > cylinders dry and cold. Didn't bother putting any oil in the cylinders
> > to do further checks, since I was happy with the readings.
> > Hope this helps!

>
> > Alex

>
> Thanks Alex;
> It certainly does, as it provides a reference to effectiveness of the
> same oil I'm using.
> Thank you very much.again
> danielR


No problem Daniel. Good luck!
  #9  
Old February 22nd 10, 04:10 AM posted to rec.autos.makers.saturn
Private
external usenet poster
 
Posts: 145
Default compression test


"navaidstech" > wrote in message
...
>
> Let's see... I've got a 92 SL1 SOHC with 553,000 km on it. Been
> putting Castrol Synth in it and a cheap Motomaster oil filter since
> the car had 100,000 km on the odometer. I change my oil every 10,000
> kms.
> Did a compression test about a month ago and got 185-190 PSI in all
> cylinders dry and cold. Didn't bother putting any oil in the cylinders
> to do further checks, since I was happy with the readings.
> Hope this helps!
>
> Alex


You should be happy with these numbers and your service life. I would
normally suggest verifying the compression test gauge but why tempt fate, if
it aint broke, etc., it is the cylinder variation that is most important
anyway.

Looks like you got a good one, keep it as long as you can and don't fix
anything that doesn't need opening up.

Good luck.


  #10  
Old March 12th 10, 01:19 AM posted to rec.autos.makers.saturn
navaidstech
external usenet poster
 
Posts: 37
Default compression test

On Feb 21, 10:10*pm, "Private" > wrote:
> "navaidstech" > wrote in message
>
> ...
>
>
>
> > Let's see... I've got a 92 SL1 SOHC with 553,000 km on it. Been
> > putting Castrol Synth in it and a cheap Motomaster oil filter since
> > the car had 100,000 km on the odometer. I change my oil every 10,000
> > kms.
> > Did a compression test about a month ago and got 185-190 PSI in all
> > cylinders dry and cold. Didn't bother putting any oil in the cylinders
> > to do further checks, since I was happy with the readings.
> > Hope this helps!

>
> > Alex

>
> You should be happy with these numbers and your service life. *I would
> normally suggest verifying the compression test gauge but why tempt fate, if
> it aint broke, etc., it is the cylinder variation that is most important
> anyway.
>
> Looks like you got a good one, keep it as long as you can and don't fix
> anything that doesn't need opening up.
>
> Good luck.


Thanks for the words of encouragement.
I intend to keep the car as long as I possibly can although it got
really close to getting junked a couple of months ago.
One of the timing chain guides has shattered leaving the chain
rattling and car losing power. My wife was super happy as she wants me
to get rid of the car and buy something "decent".... well, I stuck to
my guns, ordered a new kit and replaced the chain, guides, sprockets,
etc...
Now the car runs like new and my wife ain't very happy about that! LOL

BTW... guys at work are having a tough time believing that the car
being as old as it is (18+ years) still runs on the original clutch
and the exhaust system (well, the muffler was replaced a few times,
but everything else is original)


Alex
 




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