If I have numbers of 110 across all 4 cylinders, could it be pistons or head?? Just need an idea of where to start. Its rebuild time folks Thanks.}(

Do a leakdown. If the numbers go up - rings. If they stay the same - head. :thumbsup

Could also be the pressure tester itself. Is the car running like poop? Cause yeah, 110 is about half compression.


95 Eclipse RS : 5 speed
15.7 @ 87.9mph
Jeep TB writeup - http://www.dimensia.com:81/jimbo/JeepTBfor2gnt.html

Originally posted by DR1665
Do a leakdown. If the numbers go up - rings. If they stay the same - head. :thumbsup

a leakdown IS NOT a compression test with a cap of oil in the chamber. That's a WET TEST. A Leakdown is application of pressurized air and monitoring how much pressure the cylibder holds, and where the air leaks through. Oil cap = rings. Rad cap = HG. TB or tailpipe, valves.

Originally posted by DarkOne

Originally posted by DR1665 Do a leakdown. If the numbers go up - rings. If they stay the same - head. :thumbsup

a leakdown IS NOT a compression test with a cap of oil in the chamber. That's a WET TEST. A Leakdown is application of pressurized air and monitoring how much pressure the cylibder holds, and where the air leaks through. Oil cap = rings. Rad cap = HG. TB or tailpipe, valves.

hes right you know. a leakdown tester is a unit with two gauges, one for psi going into the cylinder and one for compression, and you basically look for bubbles in coolant or listen for where air is escaping.

sorry brian just felt like stickin it to ya:thumbsup

Originally posted by DarkOne
a leakdown IS NOT a compression test with a cap of oil in the chamber. That's a WET TEST. A Leakdown is application of pressurized air and monitoring how much pressure the cylibder holds, and where the air leaks through. Oil cap = rings. Rad cap = HG. TB or tailpipe, valves.

ding ding ding, we have a winner.

110 definately sounds low, I would try it with another tester. All the cylinders being that bad is kind of surprising.



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una salus victus
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what elevation are you at that changes alot with air density..

and try another tester.

if you're on the moon :wary

I dont care what elevation, those numbers are skewed.

Originally posted by DarkOne

Originally posted by DR1665 Do a leakdown. If the numbers go up - rings. If they stay the same - head. :thumbsup

a leakdown IS NOT a compression test with a cap of oil in the chamber. That's a WET TEST. A Leakdown is application of pressurized air and monitoring how much pressure the cylibder holds, and where the air leaks through. Oil cap = rings. Rad cap = HG. TB or tailpipe, valves.

I, the humble choad, bow down to the wisdom radiating from the omnipotent 2GNT patriarch. :bowdown

You never know you don't know until someone tells you so. Thanks sir. :thumsbup