Compression Test

[rythmman]

I just did a dry compression test on my older Mazda B3 engine.
1&3 = 150
2&4 = 180

Anyone with engine experience to tell me what this means?
I know they should all be within 10%.
Thanks

 

[ubercal]

I just did a dry compression test on my older Mazda B3 engine.
1&3 = 150
2&4 = 180

Anyone with engine experience to tell me what this means?
I know they should all be within 10%.
Thanks

It means cylinders 1 and 3 have lower compression then cylinders 2 and 4.Now its time to find out why the compression is low on those 2 cylinders.Could be a few things such as worn piston rings or head gaskets.

You should follow this up with leakdown test to further isolate the issue.

 

[rythmman]

May be head gasket, as there is a bit of water at exhaust.

 

[ubercal]

The leakdown test will tell you provide you with alot more answers , could be intake / exhaust valve leaks or piston rings worn.