LOW compression on middle 2

wylie

wylie

Hi All - newbie as of today

finally checked compressions this morn on my beloved Pao - oh dear!

all plugs out, cold engine, 4 cranks each - 130k kilometres

130 - 82 - 75 - 140

All plugs look identical - a little too white if anything.

Historically I have moaned about lack of performance and economy and it looks like this might be the source of making a bad situation even worse.

Anyone know what they ought to be?

no loss of coolant and no obvious head gasket 'blow visible...maybe leaking internally between 2 and 3?

no missfires or apparent bad running, in fact appart from being slow it seems sweet.

Any advice gratefully recieved peeps.

Ta

Dan
 
Piston rings? Could try that little trick of putting a small amount of engine oil in the bore so see if it raises the compression. Not done it myself so not sure exactly how much oil. Google will help you no doubt.
 
Noddie said:
Piston rings? Could try that little trick of putting a small amount of engine oil in the bore so see if it raises the compression. Not done it myself so not sure exactly how much oil. Google will help you no doubt.
Click to expand...

Normally just 2 or 3 squirts from an oil can when you are doing a wet compression test (Y)
 
you are supposed to do the compression test hot.

i had similar results on my pulsar, but when i done the test hot, it evened the middle two up
 
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