low engine compression (50PSI)

[aviel131]

hello
yasterday i did compression test to the engine, i found that i have low compression in all 4 cyl.
i got about 50PSI dry and 75PSI wet

what can cause this low compression ?

CYL 1:

CYL 2:

CYL 3:

CYL 4:

 

[<tuffty/>]

Worn rings/bores and worn valves/seats... typically this should be 180psi to 190psi

<tuffty/>

 

[aviel131]

so its need rebuild? (engine run fine no power loss) but idle is rough.

 

[c20tbo]

I find it strange that it still runs fine with such low compression, what's the mileage? head off job to determine fault.

 

[epox]

Is the compression gauge working correctly?

 

[badger5]

validate gauge.. thats a very low compression
leakdown check I would do also, and confirm the motors not got 4 bent rods so lower compression..
(unlikely all 4.. but you never know)

 

[newbster]

i doubt the engine would even run with those figures
i suspect faulty guage or not doing the test properly, should have all plugs out, throttle wide open, if you have throttle plate) and a fully charged healthy battery