Compression Test (Done)
01-24-2010, 10:36 PM
#1
Compression Test (Done)
took my car to the dealership and got a compression test done... results were 14 bar on all.
no idea how good/bad is this.
i'm not sure if being at sea level affect the psi or not, and how much does it have of an effect.
comments please..
thanks!
no idea how good/bad is this.
i'm not sure if being at sea level affect the psi or not, and how much does it have of an effect.
comments please..
thanks!
01-25-2010, 01:54 AM
#4
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I think you're confusing Static Compression with Compression Ratio. 10.3:1 is the Compression Ratio
Static Compression testing in simple terms is a way of measuring a motor's health. The idea is to have consistant pressures along all 6 cylinders. Most common cause for low compression in a cylinder would be a worn pistion ring.
1Bar=14.7psi if i remember correctly..that should put you at about 205psi per cyl.
Jared from Z1 confirm above that this is in spec, so congrats man. You have a healthy VQ.
Static Compression testing in simple terms is a way of measuring a motor's health. The idea is to have consistant pressures along all 6 cylinders. Most common cause for low compression in a cylinder would be a worn pistion ring.
1Bar=14.7psi if i remember correctly..that should put you at about 205psi per cyl.
Jared from Z1 confirm above that this is in spec, so congrats man. You have a healthy VQ.
Last edited by boosted99gst; 01-25-2010 at 01:56 AM.
01-25-2010, 07:43 AM
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yes, you should be ok. how many miles do you have on the car? even if you have some decent miles on the car it should be ok for the SC to go on, i just wouldn't beat on it all the times if it has a decent amount of miles.
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01-27-2010, 04:05 AM
#12
umm.. trying to clarify my doubts on those numbers..
so there might be different compression readings from different testers..? and does those numbers have value other than knowing the variance between cylinders and if leak is present?
what if the same tester/gauge was used on two different engines, and both produced constant readings, but a big gap between the two.??
e.g.
---------------------
engine 1
140, 140, 145, 150, 145, 150
engine 2
200, 210, 205, 200, 205, 210
--------------------
so there might be different compression readings from different testers..? and does those numbers have value other than knowing the variance between cylinders and if leak is present?
what if the same tester/gauge was used on two different engines, and both produced constant readings, but a big gap between the two.??
e.g.
---------------------
engine 1
140, 140, 145, 150, 145, 150
engine 2
200, 210, 205, 200, 205, 210
--------------------
01-28-2010, 01:32 AM
#13
umm.. trying to clarify my doubts on those numbers..
so there might be different compression readings from different testers..? and does those numbers have value other than knowing the variance between cylinders and if leak is present?
what if the same tester/gauge was used on two different engines, and both produced constant readings, but a big gap between the two.??
e.g.
---------------------
engine 1
140, 140, 145, 150, 145, 150
engine 2
200, 210, 205, 200, 205, 210
--------------------
so there might be different compression readings from different testers..? and does those numbers have value other than knowing the variance between cylinders and if leak is present?
what if the same tester/gauge was used on two different engines, and both produced constant readings, but a big gap between the two.??
e.g.
---------------------
engine 1
140, 140, 145, 150, 145, 150
engine 2
200, 210, 205, 200, 205, 210
--------------------
01-29-2010, 09:24 PM
#14
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not sure what you're asking here. in ur example you are saying that the tests resulted with two DIFFERENT results in two DIFFERENT motors, whats to question? I'd like to be of more help, but I cannot make sense of what you're asking.
01-18-2011, 03:47 PM
#16
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The reason
The differance could be a few things.The differance between a wet run and a dry run with a shot of oil in each cyl. The mileage could be a big factor.If the motor had boost added to it.
umm.. trying to clarify my doubts on those numbers..
so there might be different compression readings from different testers..? and does those numbers have value other than knowing the variance between cylinders and if leak is present?
what if the same tester/gauge was used on two different engines, and both produced constant readings, but a big gap between the two.??
e.g.
---------------------
engine 1
140, 140, 145, 150, 145, 150
engine 2
200, 210, 205, 200, 205, 210
--------------------
so there might be different compression readings from different testers..? and does those numbers have value other than knowing the variance between cylinders and if leak is present?
what if the same tester/gauge was used on two different engines, and both produced constant readings, but a big gap between the two.??
e.g.
---------------------
engine 1
140, 140, 145, 150, 145, 150
engine 2
200, 210, 205, 200, 205, 210
--------------------
01-18-2011, 07:35 PM
#17
umm.. trying to clarify my doubts on those numbers..
so there might be different compression readings from different testers..? and does those numbers have value other than knowing the variance between cylinders and if leak is present?
what if the same tester/gauge was used on two different engines, and both produced constant readings, but a big gap between the two.??
e.g.
---------------------
engine 1
140, 140, 145, 150, 145, 150
engine 2
200, 210, 205, 200, 205, 210
--------------------
so there might be different compression readings from different testers..? and does those numbers have value other than knowing the variance between cylinders and if leak is present?
what if the same tester/gauge was used on two different engines, and both produced constant readings, but a big gap between the two.??
e.g.
---------------------
engine 1
140, 140, 145, 150, 145, 150
engine 2
200, 210, 205, 200, 205, 210
--------------------
Engine 1 is still acceptable. Normal wear and tear occurs and causes a loss of compression. As long as that all cylinders are consistent, then that is an indication of normal wear and tear.
On the other hand, if you have a motor with 200, 200, 200, 200, 200, 150. Then that is an indication of one bad cylinder, even though the cylinder with 150psi is still within spec.
I doubt that all of the high strung, turbo'd stock block daily driver are still in the 200 range. And I highly doubt that a smooth running VQ with 150,000 miles on it would still have 200 on all six cylinders.
07-31-2011, 08:31 PM
#19
Registered User
According to the '07 SM, the standard at 300rpm is 185psi. Minimum is 142psi, and max allowable difference between cylinders is 14psi.
Having the test done at sea level will give the higher readings than having it done at higher elevations.
Having the test done at sea level will give the higher readings than having it done at higher elevations.
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